SBS改性沥青外文翻译文献

中英文对照外文翻译文献中英文对照外文翻译文献(文档含英文原文和中文翻译)中英文对照翻译Asphalt Mixtures-Applications, Theory andPrinciples1 . ApplicationsAsphalt materials find wide usage in the construction industry. The use of asphalt as a cementing agent in pavements is the most common of its applications, however,and the one that will be considered here.Asphalt products are used to produce flexible pavements for highways andairports. The term “flexible” is used to distinguish these pavements from those made with Portland cement, which are classified as rigid pavements, that is, having beam strength. This distinction is important because it provides they key to the design approach which must be used for successful flexible pavement structures.The flexible pavement classification may be further broken down into high andlow types, the type usually depending on whether a solid or liquid asphalt product is used. The low types of pavement are made with the cutback, or emulsion, liquid products and are very widely used throughout this country. Descriptive terminology附 录has been developed in various sections of the country to the extent that one pavement type may have several names. However, the general process followed in constructionis similar for most low-type pavements and can be described as one in which the aggregate and the asphalt product are usually applied to the roadbed separately and there mixed or allowed to mix, forming the pavement.The high type of asphalt pavements is made with asphalt cements of some selected penetration grade.中英文对照外文翻译文献中英文对照外文翻译文献Fig. ·1 A modern asphalt concrete highway. Shoulder striping is used as a safely feature.Fig. ·2 Asphalt concrete at the San Francisco International Airport.They are used when high wheel loads and high volumes of traffic occur and are, therefore, often designed for a particular installation.2 . Theory of asphalt concrete mix designHigh types of flexible pavement are constructed by combining an asphalt cement, often in the penetration grade of 85 to 100, with aggregates that are usually divided into three groups, based on size. The three groups are coarse aggregates, fineaggregates, and mineral filler. These will be discussed in detail in later chapter.Each of the constituent parts mentioned has a particular function in the asphaltmixture, and mix proportioning or design is the process of ensuring that no function is neglected. Before these individual functions are examined, however, the criteria for pavement success and failure should be considered so that design objectives can be established.A successful flexible pavement must have several particular properties. First, itmust be stable, that is to resistant to permanent displacement under load. Deformation of an asphalt pavement can occur in three ways, two unsatisfactory and one desirable.附 录Plastic deformation of a pavement failure and which is to be avoided if possible. Compressive deformation of the pavement results in a dimensional change in the pavement, and with this change come a loss of resiliency and usually a degree of roughness. This deformation is less serious than the one just described, but it, too, leads to pavement failure. The desirable type of deformation is an elastic one, which actually is beneficial to flexible pavements and is necessary to their long life.The pavement should be durable and should offer protection to the subgrade. Asphalt cement is not impervious to the effects of weathering, and so the design must minimize weather susceptibility. A durable pavement that does not crack or ravel will probably also protect the roadbed. It must be remembered that flexible pavements transmit loads to the subgrade without significant bridging action, and so a dry firm base is absolutely essential.Rapidly moving vehicles depend on the tire-pavement friction factor for control and safety. The texture of the pavement surfaces must be such that an adequate skid resistance is developed or unsafe conditions result. The design procedure should be used to select the asphalt material and aggregates combination which provides a skid resistant roadway.Design procedures which yield paving mixtures embodying all these properties are not available. Sound pavements are constructed where materials and methods are selected by using time-tested tests and specifications and engineering judgments along with a so-called design method.The final requirement for any pavement is one of economy. Economy, again, cannot be measured directly, since true economy only begins with construction cost and is not fully determinable until the full useful life of the pavement has been recorded. If, however, the requirements for a stable, durable, and safe pavement are met with a reasonable safety factor, then the best interests of economy have probably been served as well.With these requirements in mind, the functions of the constituent parts can be examined with consideration give to how each part contributes to now-established objectives or requirements. The functions of the aggregates is to carry the load imposed on the pavement, and this is accomplished by frictional resistance and interlocking between the individual pieces of aggregates. The carrying capacity of the asphalt pavement is, then, related to the surface texture (particularly that of the fine aggregate) and the density, or “compactness,”, of the aggregates. Surfa ce texture中英文对照外文翻译文献中英文对照外文翻译文献varies with different aggregates, and while a rough surface texture is desired, this may not be available in some localities. Dense mixtures are obtained by using aggregates that are either naturally or artificially “well graded”. This means tha that are either naturally or artificially “well graded”. This means that the fine t the fineaggregate serves to fill the voids in the coarser aggregates. In addition to affecting density and therefore strength characteristics, the grading also influences workability. When an excess of coarse aggregate is used, the mix becomes harsh and hard to work. When an excess of mineral filler is used, the mixes become gummy and difficult to manage.The asphalt cement in the flexible pavement is used to bind the aggregateparticles together and to waterproof the pavements. Obtaining the proper asphalt content is extremely important and bears a significant influence on all the items marking a successful pavement. A chief objective of all the design methods which have been developed is to arrive at the best asphalt content for a particularcombination of aggregates.3 . Mix design principlesCertain fundamental principles underlie the design procedures that have beendeveloped. Before these procedures can be properly studied or applied, someconsideration of these principles is necessary.Asphalt pavements are composed of aggregates, asphalt cement, and voids.Considering the aggregate alone, all the space between particles is void space. The volume of aggregate voids depends on grading and can vary widely. When the asphalt cement is added, a portion of these aggregate voids is filled and a final air-voidvolume is retained. The retention of this air-void volume is very important to thecharacteristics of the mixture. The term air-void volume is used, since these voids are weightless and are usually expressed as a percentage of the total volume of thecompacted mixture.An asphalt pavement carries the applied load by particle friction and interlock. If the particles are pushed apart for any reason , then the pavement stability is destroyed. This factor indicates that certainly no more asphalt should be added than the aggregate voids can readily hold. However ,asphalt cement is susceptible to volume change and the pavement is subject to further compaction under use. If the pavement has no air voids when placed, or if it loses them under traffic, then the expanding asphalt will overflow in a condition known as bleeding. The loss of asphalt cement throughbleeding weakens the pavement and also reduces surface friction, making the roadway附 录hazardous.Fig. ·3 Cross section of an asphalt concrete pavement showing the aggregate framework bound together by asphalt cement.The need for a minimum air-void volume (usually 2 or 3 per cent ) has been established. In addition, a maximum air-void volume of 5 to 7 per cent should not be exceed. An excess of air voids promotes raveling of the pavement and also permits water to enter and speed up the deteriorating processes. Also, in the presence of excess air the asphalt cement hardens and ages with an accompanying loss of durability and resiliency.The air-void volume of the mix is determined by the degree of compaction as well as by the asphalt content. For a given asphalt content, a lightly compacted mix will have a large voids volume and a lower density and a greater strength will result. In the laboratory, the compaction is controlled by using a specified hammer and regulating the number of blows and the energy per blow. In the field, the compaction and the air voids are more difficult to control and tests must be made no specimens taken from the compacted pavement to cheek on the degree of compaction being obtained. Traffic further compact the pavement, and allowance must be made for this in the design. A systematic checking of the pavement over an extended period is needed to given factual information for a particular mix. A change in density of several per cent is not unusual, however.Asphalt content has been discussed in connection with various facets of the ix design problem. It is a very important factor in the mix design and has a bearing an all the characteristics ld a successful pavement: stability, skid resistance, durability, and economy. As has been mentioned, the various design procedures are intended to provide a means for selecting the asphalt content . These tests will be considered in中英文对照外文翻译文献中英文对照外文翻译文献detail in a future chapter ,but the relationship between asphalt content and the measurable properties of stability, unit weight, and air voids will be discussed here.Fig.4 Variations in stability, unit weight, and air-void content with asphalt cement content.If the gradation and type of aggregate, the degree of compaction, and the type of asphalt cement are controlled, then the strength varies in a predictable manner. The strength will increase up to some optimum asphalt content and then decrease with further additions. The pattern of strength variation will be different when the other mix factors are changed, and so only a typical pattern can be predicted prior to actual testing.Unit weight varies in the same manner as strength when all other variable arecontrolled. It will reach some peak value at an asphalt content near that determined from the strength curve and then fall off with further additions.As already mentioned, the air-void volume will vary with asphalt content. However, the manner of variation is different in that increased asphalt content willdecrease air-void volume to some minimum value which is approached asymptotically. With still greater additions of asphalt material the particles of aggregate are only pushed apart and no change occurs in air-void volume. In summary, certain principles involving aggregate gradation, air-void volume, asphalt content, and compaction mist be understood before proceeding to actual mix design. The proper design based on these principles will result in sound pavements. If these principles are overlooked, the pavement may fail by one or more of therecognized modes of failure: shoving, rutting, corrugating, becoming slick when the max is too …rich‟; raveling, cracking,having low durability when the mix is too …lean‟.It should be again emphasized that the strength of flexible is, more accurately, a附 录stability and does not indicate any ability to bridge weak points in the subgrade by beam strength. No asphalt mixture can be successful unless it rests on top of a properly designed and constructed base structure. This fact, that the surface is no better than the base, must be continually in the minds of those concerned with any aspect of flexible pavement work.中英文对照外文翻译文献中英文对照外文翻译文献译文：译文：沥青混合料的应用、理论和原则1、应用沥青材料如今在建筑行业广泛使用。

SBS改性沥青外文翻译文献(文档含中英文对照即英文原文和中文翻译)The SBS modified pitch match ratio design and discussion of construction technology [The summary ] under good design match ratio and execution conditions, SBS pitch can make the durability on the pitch road surface and high-temperature stabilityobviously improve . This text will test the situation according to the construction of No. two in the south , will tell the construction specification requirement for the modified pitch of SBS briefly .First, SBS modified pitch summaryThe modified pitch of SBS is on the basis of original host pitch (AH-70 ), is it add 2.5% - 3.0% to mix, 4.0% SBS modify pharmaceutical, modify pitch after , compare with original pitch, its high-temperature viscid increases, soften and click rising. Under good design match ratio and execution conditions, the durability on the pitch road surface and high-temperature stability obviously improve. Test while going on in a large number of rooms while the modified pitch of SBS produces, carry on the on-the-spot experiment to its technical indicator after production, experimental result indicate outside mix 3.0% modified pitch of SBS , soften some , needle enter degree index meet modified pitch standardize the request, can make the match ratio design of the pitch mixture with the modified pitch of SBS .Second, the match ratio of the pitch mixture of SBS is designedIn order to enable the mixture designed to reach the implementing effect, need to propose the following request from a great deal of respects , such as material requiring , construction craft , quality control standard and quality control method ,etc., hope to arouse attention.(1) , the raw materials are requiredCollect the material thickly by 1-1:For the thick collection material of layer the modified pitch mixture, should adopt the broken stone or garrulous gravel , its specification of foot-path and quality requirement should accord with the regulation of " pitch road surface construction technical specification of the highway " (JTJ032-94 )1.It should be clean , dry , has not weathered , not harmful to the impurity to collect the material thickly , and have certain hardness and intensity.2.It should have good particle forms to collect the material that thick, when the broken gravel is used in the expressway , Class I Highway, should adopt the big gravel brokenly , and there should be two or more brokenness ones at least.3, should choose the hard quality rock to collect the material in resisting the slippery top layer thickly (neutral or base rock that burn). Because there are greater differences in the glue the relay of hard quality rock and pitch, the thick seizing which collects the material and pitch should not be smaller than 4 grades . To 3- 5mm stone bits part it is relatively low because of the content, and this part forms the scary structure and has certain function to the pitch mixture, propose using the rock bits of hard quality (basalt).Collect the material thinly by 1-2The detailed collection material includes artificial sand , natural sand. Each of pitch road surface should adopt the artificial sand as collecting the material thinly , it should be clean , dry , has not weathered , not harmful to the impurity to collect the material thinly, made up of proper particle, and have good seizing with the modified pitch, natural sand change with quality heavy(majority thick sand in being), relatively slick and sly form have, with the seizing difference of the pitch , exert a great influence on pitch mixture. To the expressway , Class I Highway pitch mixture, the content of the natural sand is unsuitable to exceed 20%, the stone bits powder of available 0-3mm replaces the natural sand.Pack the material by 1-3Packing of layer should clean dry the mixture for modified pitch, specification requirement that quality should accord with the regulations of " pitch road surface technical specification of the highway " its.1, the modified pitch mixture should be adopted the strong base rock (limestone , rock ) ,etc. to increase the building stones of swimming skill to rub the detailed ore powder that got to pack the material, ore it is dry clean , unsuitable to use mixture production do recovery powder , law of dust removal for powder to require.2, while adopting the cement, subdues the lime powder to make packing, its consumption is unsuitable to exceed 2% of the ore material general quantity.3, does not recommend using and producing and arranging and retrieving the powder in the mixture one floor of mixture of pitch surface, when the plasticity index is smaller than 4 and hydro coefficient is smaller than 0.8, through testing all right someuse, retrieve 1/4 that can't exceed the ore powder general quantity of each one of consumption of powder.(2) , pitch mixture match ratio is designed:Match ratio design of the modified pitch mixture, should follow " the pitch road surface construction technical specification of the highway " China mixes pitch mixture goal match ratio , match ratio of production that are designed of match ratio and tries mixing three stages that try paving about heat, confirm ore material one grade of mixing and best modified pitch consumption.2-1 grades mixingPitch mixture match ratio is designed grade mixes and should adopt MEI LI FAN to design , grade is worthy of choosing the principle: Should fetch grade and mix lower limit to sift the hole in order to reach under mixture 2.36mm of Model AC-13I.2-2 powder expect thanThe amount smaller than 0.075mm content exerts a tremendous influence to the index of volume of pitch mixture and way with performance , mixture grade content to smaller than 0.075mm must consider thick to collect dust part that material should contain in mixing. Require ore powder content exceed pitch content , smaller than 0.075mm part and ratio , pitch of content powder material than should exist 1- 1., should fetch the content of ore powder of one floor of mixture the pitch 4.5- 5.2-3 precautions:The modified pitch mixes and arouses attention on the following problem in the design process with the material .Shut and should hit real temperature according to the road surface construction technical specification of modified pitch and confirms according to bonding material the warm relation curve of glued material of pitch in the mixing of A , mixing and material, mixing and shutting , hitting real temperature and should mix and shuts temperature with mix and shut the factory , rolls temperature live while carrying on the indoor match ratio design. Propose that temperature sees the following form:The test of the modified pitch and construction temperature:Temperature security mixes the pitch mixtureIt is not below 160 degrees Centigrade to mix the temperature of shutting; Press temperature and is not below 150 degrees Centigrade for the first time; It is not below 140 degrees Centigrade to reply the temperature of pressing;Press temperature and is not below 120 degrees Centigrade after all.B , test take a sample and mix the fashionable homogeneity that should guarantee the glued material of pitch , should prepare good glued material mix after shutting even going on taking a sample and preparation of mixture.The survey of C , mixture volume index will be unified , the survey mixing the pitch mixture and trying a density to security should adopt forms to do the law in unison .Water and stability of D , modified pitch mixture should accord with two following index requests , should be taken and resisted to peel off the measure while reaching the request:(1), adopt " Marshall of pitch mixture steady degree test " 48h soaked with water Marshall steady degrees of test that method determine remain steady degree should lighter than 80% ".( 2) , adopt " pitch mixture is it is it is it test " intensity of splitting off that method determine than should 80% lighter than " to split off to melt to freeze.Third, construction of the pitch mixture of SBSSBS pitch one with elastic plastic modified pitch, correct to is it can improve story resist rut performance the pitch notably to use, increase durability, increase and resist aging ability , lengthen the life-span of the highway. Compared with host pitch of AH-70, the viscid and mollification and clicking increasing notably of SBS pitch , the transportation of SBS pitch has some requests different from host pitch to construct with floor the road surface to store, only use reaching the anticipated result correctly. 1, mix the specification requirement shut , transportingMore steady for the quality of guaranteeing the pitch mixture, pitch consumption is more accurate, should adopt the interval type mixing and stir machine to mix and stir . It must be even to mix and stir, only SBS pitch modifies the pharmaceutical is totally dispersed in the pitch , could give full play to its efficiency , as to the thing thatsecurity mixes(AC-13I) the mixture, it is even and unanimous to mix the mixture after shutting, phenomenon that not so separated from thick material and black and white forming the group one as thin material . Because the temperature of construction of the modified pitch mixture of SBS is expected relatively much, propose mixing the temperature of shutting to control in 160 degrees Centigrade, the transport communication must put on tarpaulin or other heat insulator , prevent combining the material surface to form hard , it accords with the technical specification request that big or small in order to guarantee paving in succession and roughness, must guarantee that at least two cars waited to unload the material , the phenomenon that must not present the spreading machine and wait for bus in front of the spreading machine. The others require that should meet the specification requirement for the road surface construction technical specification of modified pitch .2, the specification requirement pavedSuccessive construction that SBS pitch mixture should try one's best while paving, in order to reduce the stopping of the pave and road roller , should try one's best to reduce and sew , improve its roughness. In order to improve the roughness of the road surface, the surface layer should keep the sled type of the same discrepancy in elevation paving the control method of the thickness before and after adopting and paving . Because SBS pitch viscid is relatively great, it is strong to seize strength, it is the rubber type structure to use the back sleds of some spreading machines, the rubber is apt to seize the thin particle of mixture, influence the roughness, so the sled is that rubber type structure must be made into the slippery boots type structure of steel after the pave. Pave the speed and should be controlled in 2 meters per minute, make sure to pave without stopping slowly , evenly and in succession , forbid varying the speed or layover at will .The ones that improved and paved in the course were pressed closely knit degree in advance. The modified pitch SBS mixture is mainly by collecting inlaying the function of crowding of material thickly under the high-temperature state, but improve the ram hammer properly and shake the frequency of smashing , make surplus ramming coefficient reduce, the mark pressed for the first time is extremelysmall, and then guarantee the final roughness of the road surface .3, the specification requirement rolledTo the security mixing type mixture, its suitable rolling the temperature range is 130 degrees Centigrade- 150 degrees Centigrade, it roll temperature and is not lower than 110 degrees Centigrade finally.The ramming craft of the pitch mixture of SBS goes on in line with the following principle: According to is it " roll the Eight Character policy roll to " follow keep , high frequency , low piece closely , not slow ", the road roller must be followed closely in the back of the spreading machine, only by rolling make better result under the high-temperature condition can it, the speed of ramming is controlled in 4- 5km/h. It is balanced to roll the speed, close vibration when falling back, the direction should change gradually, mustn't twist curved to walk, to roll starting point or terminal point can twist & warping roll together while being every, dispel and roll and connect a mark . Will never allow to change direction , turn back , move the position from side to side in paving the pitch mixture newly. Brake or is it have a rest to park suddenly, through south two No. first, two contract sections of SBS pitch test section, the definite ramming craft is each rolled 3 times for DD110 or 2- shelves of DD130 road roller, namely press once for the first time, high-frequency low pieces of vibration are rolled 2 times, press 2 times after all . Pay special attention to: While constructing when find that the road roller glues the wheel, it is better to use water of the washing powder.4, the quality control of the pitch mixture of SBSTo one floor of mixture pitch, the ramming result of the scene should adopt the space rate and press the solidity to control two-wryly . It is subject to that survey every day to calculate the largest density of theory needed in space rate, is it go on according to " pitch road surface mixture heavy relative density test (vacuum law ) (T0711- 93 ) most " to test. The on-the-spot pitch mixture space rate is 3%- 6. One layer of pitch mixture of surface presses the inspection of the solidity, that survey the core kind serves as the standard.Four, conclusionWith the further popularization in our country of modified pitch of SBS, will play an important role in road construction of our country, it hopes to be to SBS modified pitch in production construction specification requirement that should notice in constructing through the above, helpful to everybody, the above-mentioned weak points, hope that every colleague puts forward the valuable suggestion .关于SBS改性沥青配合比设计及施工技术的探讨[摘要] 在良好的设计配合比和施工条件下，SBS沥青能使沥青路面的耐久性和高温稳定性明显提高。

附录The Development of the Conservation of AsphaltPavementAsphalt pavement in the use of the process, constantly subject to the role of repeated traffic loads, climate impact and asphalt pavement materials, physical and chemical changes, over time, will have a pit, crack, swarming spore, subsidence, while eating, Ma surface , peeling and loose a variety of damage, if not repaired, the damage will be expanded rapidly and affect the normal passage of vehicles, and may lead to a greater degree of damage. Asphalt Pavement Maintenance vehicle is dedicated to timely repair the damage part of the special vehicles. Shown as an ordinary car Asphalt Pavement Maintenance.1 Classification and functionAccording to the nature of road paving materials, road vehicles can be divided into a comprehensive conservation Asphalt Pavement Maintenance trucks and cement trucks Pavement Maintenance two categories, this book introduces the Asphalt Pavement Maintenance Truck. Asphalt Pavement Maintenance vehicles is divided into trailers by the way traffic and two types of self-propelled.Towed Asphalt Pavement Maintenance vehicles are a variety of equipment and devices will be installed on the trailer chassis, the general use of self-powered engine output range of devices and equipment, from a car or tractor to the construction of sections of the conservation work carried out.Self-Asphalt Pavement Maintenance vehicles are a variety of equipment and devices will be installed on the vehicle chassis or exclusive as the self-end, removed from the chassis host two types of motivation and self-engines. At present, the production of integrated conservation of the asphalt is the most self-propelled vehicles of.Based on the technical level of the road, the quality and quantity of the different selection of different types of Asphalt Pavement Maintenance vehicles. High-gradehighway mileage in the asphalt pavement of more than 300km for the use of large-scale conservation of self-propelled vehicles; medium-sized self-propelled vehicle for the conservation of 200-300km of high-grade asphalt pavement minor repairs, maintenance; 200km below the asphalt pavement for the use of high-grade self-small conservation of vehicles. Daily Maintenance of Asphalt Pavement in general for the use of small self-propelled or towed vehicle conservation.Asphalt Pavement Maintenance for road vehicles in addition to day-to-day tasks of conservation, but also other facilities can be used for highway maintenance, traffic engineering facilities, such as spraying and cleaning, snow removal, cleaning the road surface, cut away weeds, spraying, planting and trimming trees.2 multi-purpose road vehicles at home and abroad overview of conservation and development trends2.1 Overview abroadAsphalt Pavement Maintenance Machinery abroad have been a hundred years the history of high-grade highway for minor repairs of the asphalt pavement of the integrated conservation of mechanical operations have 60-a 70-year history. Them according to the functions and operations can be divided into the following.(1)With infrared heating function Pavement Maintenance car models for the United States on behalf of Thermal Power Corporation (Thermal PowerCo.) King of the road. Its most prominent feature of the old material can be recycled in situ, thereby bring about considerable savings in asphalt mixture, in favor of environmental protection and conservation of energy. At the same time, as a result of mixture with the original road is a natural joints combination of old and new roads close, you can extend the life of the new road. The model applicable to shallow holes, cracks, cracks and other damage to the handling of the asphalt pavement. The vehicle is equipped with hot-mix boxes, asphalt tanks and sprinkler systems, and infrared propane gas heater, compaction tools, waste tanks.(2)Mixture with hot boxes and broken pavement compaction tool Pavement Maintenance car model is the United States on behalf of Akzo Nobel company TP4-based integrated conservation vehicles. The more the number of vehicles in foreign countries, usually with the following equipment: 7t heat insulation material boxes, spiral out of feeder, asphalt spraying device, and vibration-ho ram broken. The models applied to patch small pit operation.(3)Jet car repair on behalf of the conservation model is the official music of the high road repair company cars, the largest high-pressure injection is characterized by the adoption of the ways in which a different charge of the emulsified asphalt and aggregate to be mixed and sprayed into the pits to deal with in to achieve the purpose of maintenance and repair of the road the car can be opened to traffic immediately. The model applies to a smaller stream of pits of repair work.(4)Comprehensive conservation repair work on behalf of car models produced LeeBoy the United States 1200-S-type of asphalt pavement repair vehicle integrated. It has a miller, spraying asphalt, paving and other features, equipped with a milling machine, paving equipment, asphalt me, hydraulic sprinkler system and asphalt-ho. The model applies to a small area of repair operations.2.2 Overview of domesticWith highway construction in China's rapid development, in particular, the traffic mileage of highway continues to increase, the domestic machinery of the road more and more emphasis on conservation. The 20th century, some of the 80's started a lot of companies have developed products to market. On the integrated conservation of vehicles, the domestic current owners have developed the following types of conservation.(1)TP4-based Pavement Maintenance car full hydraulic control, with storage, crushing, compaction equipment and other road maintenance equipment Yung Road, Maung. It is the introduction of the United States in Xi’an building auromatically • Akzo Nobel technology, enterprise development by the domestic products.(2)Regeneration asphalt mixture characterized by the conservation of cars expected to regeneration with the old, old asphalt can generally through the addition of some new materials and renewable sources of new agents is expected to achieve the old shop, with a broken, regeneration, compaction equipment and other attachments. However, this equipment can not be used for high-grade renewable materials for road maintenance, the use of occasions by a lot of restrictions.(3)Heating wall with regeneration in situ conservation of vehicles on the road to soften it, harrow, Tim the new material, first-class one-stop operating pressure, energy saving, environmental protection. Both drive electric drive, there are hydraulic driven. Because development time is too short, the reliability of the product there are stilllarge deficiencies. In addition, because the device can only use the new asphalt mixture, there is also a conservation site is not expected to work without problems. 2.3 Asphalt Pavement Maintenance of our direction of development of carConservation equipment available in the planned economy era developed. With highway construction in China's rapid development. China's existing mechanisms for road maintenance is no longer suited to this situation, the state departments are to develop new policy and regulatory road maintenance to adapt to this change, it is foreseeable that this policy applies to the new norms of conservation equipment market will be favored .附录沥青路面的养护发展沥青路面在使用过程中，不断承受行车载荷的反复作用、气候的影响和沥青路面材料的物理化学变化，随着时间的推移，将产生坑槽、裂缝、涌包、沉陷、啃边、麻面、脱皮和松散等各种损坏，如不及时修补，这些损坏将迅速扩大，影响车辆的正常通行，并可能造成更大程度的损害。

SBS改性沥青的研究进展黄贵秋【摘要】介绍了目前SBS改性沥青的研究进展,从SBS改性沥青的相容性、相形态结构、流变性及高温贮存稳定性四个方面进行阐述,提出了SBS改性沥青技术的发展趋势。

%The research advances of SBS modified asphalt were introduced.The compatibility,structure of phase,rheology and the high temperature storage stability of SBS modified asphalt were explained.And the development trend of SBS modified asphalt technology was clarified.【期刊名称】《广州化工》【年(卷),期】2012(040)004【总页数】3页(P8-9,23)【关键词】改性沥青;SBS;相容性【作者】黄贵秋【作者单位】钦州学院化学化工学院,广西钦州535000【正文语种】中文【中图分类】TU535沥青作为路面材料的主要缺点是容易产生如车辙、开裂和老化等现象，因而限制了其应用范围。

对沥青进行改性可显著提高路面的使用性能，在众多改性剂中，SBS(苯乙烯－丁二烯－苯乙烯嵌段共聚物)改性沥青由于高低温性能优良、力学性能好，使路面的抗车辙能力提高，低温开裂温度降低，具有很好的抗疲劳性能和粘附性能，同时，SBS改性沥青可以回收，使其得到了非常广泛的应用，市场前景看好。

由于沥青成分复杂，对其改性机理的认识非常困难，但随着人们对沥青成分的不断深入认识，对改性机理的认识也不断深入。

本文综述了目前SBS改性沥青的研究进展，并对聚合物改性沥青技术的发展趋势进行了分析。

提高沥青改性效果的关键是解决改性剂与沥青的相容性问题，相容性好可减少搅拌时间和搅拌功率，降低能耗，改善储存，低用量下就能发挥聚合物改性作用。

附件A 译文用于长寿命沥青路面的高模量沥青混合料的性能评价Hyun Jong Lee a,1, Jung Hun Lee a,2, HeeMunPark b,*ａ土木及环境工程部门，Sejong大学，首尔，韩国等ｂ公路研究部,韩国的施工技术研究所，2311，Daehwa-Dong,Ilsan-Gu,Goyang-Si,Gyeonggi-D411 - 712年,朝鲜共和国摘要：本文介绍了用于长寿命沥青路面这一研究的高模量沥青粘结剂（HMAB）和混合料（HMAM）室内和全尺寸性能测试的研究结果。

对HMAB，首先进行粘合剂的各种测试，结果表明的HMAB劲度相比传统的不改变低温性能的粘合剂显著增加。

对混合料的室内测试有动态模量、水稳定性、轮辙和疲劳测试。

动态模量试验结果表明：在高温时HMAM的模量比常规混合料高一半；性能测试结果表明：HMAM对水分、车辙和疲劳损伤的抵抗性能比传统混合料好。

同时从全尺寸试验中发现采用HMAM的沥青层底部拉伸应变值比采用常规混合料的低，尽管采用HMAM的沥青层厚度比传统的薄。

HMAM部分的所有拉伸应变值均在长寿命沥青路面疲劳标准即疲劳极限70个微应变之内。

和室内轮辙测试结果相似，厚HMAM试验段的车辙深度低于常规路面段的1/2关键字：高模量沥青粘结剂；高模量沥青混合料；长寿命沥青路面；动态模量1．引言在韩国沥青路面预期寿命通常被设计为20年。

也就是说一个沥青路面过了20年的服务期间如果出现严重的结构性失效，路面应该重建来获得初始其结构能力。

然而，由于交通量的显著增加和预算不足，在韩国大部分旧路面已采用加铺5厘米厚结构层部分修复代替重建。

一般来说，在洗铇加铺恢复路面性能之前，新建路面的使用期超过十年。

然而，经过第一次修复之后，路面的使用寿命越来越短因为路面持续失去结构承载力的主要原因是发生在沥青层的累积损伤。

因此，如果现有路面有严重的疲劳开裂和变形，从结构和经济的角度看加铺覆盖来延长使用年限可能是无效的。

A novel emulsifier for ethanol–diesel blends and its effect on performance and emissions of diesel engineJilin Lei,Lizhong Shen ⇑,Yuhua Bi,Hong ChenYunnan Province Key Laboratory of Engines,Kunming University of Science and Technology,Kun Ming 650224,Chinaa r t i c l e i n f o Article history:Received 14September 2010Received in revised form 6June 2011Accepted 12June 2011Available online 22June 2011Keywords:Ethanol–diesel blend Emulsifier StabilityPerformance Emissiona b s t r a c tAccording to the theory of ‘‘hydrophilic–lipophilic balance (HLB)’’and the emulsification principle,the emulsification performance and stability of ethanol–diesel blends were studied with single and mixed emulsifiers and the effects of temperature on emulsification properties were analyzed.A novel mixed emulsifier,named ‘‘CLZ’’,was developed based on biofuel and castor oil and the effects of the ethanol–diesel blends with CLZ were investigated on the performance and emission characteristics of a diesel engine.The results indicated that with a CLZ-type emulsifier the ethanol–diesel blend E10can keep its physical stability at a wide range of temperatures.The use of ethanol–diesel blends with a CLZ improved the break thermal efficiency and reduced the equivalent brake-specific fuel consumption (BSFC).The smoke emission was reduced significantly and the NO x emission decreased slightly,while the THC emis-sion increased.The CO emissions increased at light loads and decreased at heavy loads.Ó2011Published by Elsevier Ltd.1.IntroductionWith the shortage of conventional energy and the increasingly stringent emission standards,it is important to develop new inter-nal combustion engines with low emissions,high fuel efficiency and high specific power.Ethanol is a renewable and oxygenated biofuel and could be potential alternative fuel for vehicles,which can be blended with diesel in the tank,or injected into the cylinder directly and burned with diesel in order to reduce the exhausted pollutants [1–4].The difficulty of dissolving ethanol in diesel and the stability of blends is influenced by the temperature and water content,espe-cially high percentages of ethanol are used and ambient tempera-tures below 10°C exist.The use of additives improves the solubility of ethanol in diesel.It was found that the solubility of eth-anol in diesel was affected by aromatic hydrocarbons,the tempera-ture of middle distillates and the paraffin content of diesel [5,6].Some research results have proven that the additives can improve not only the stability of ethanol–diesel blends,but their perfor-mance on vehicle tests.The blends can reduce the NO x emission by 10%and smoke emission by 15%,but at the cost of a power de-crease of 3–5%[7–9].Lapuerta et al.[10]reported that water con-tent,low temperature and high ethanol contents favored the phase separation and that the additives can help blends formation.Furthermore,the stability of blends was more sensitive to water content and additives than the temperature [10].The biodiesels (methyl,ethyl,and butyl esters)prepared from palm oil were used as additives in ethanol–diesel and butanol–die-sel blends [11].The results indicated that methyl ester was better than ethyl ester in improving the solubility of the ethanol–diesel blend.The use of butanol in ethanol–diesel blends could solve the problem with phase separation.The blend of 85%diesel,10%palm oil ethyl ester and 5%butanol was the most suitable,as it pro-vided a stable mixture and acceptable fuel properties for use as an alternative fuel in diesel engines [11,12].SPAN80and AEP-102were studied as additives in ethanol–diesel blends and the results showed that SPAN80was better than AEP-102on the water con-tent admission.The sorbitan esters were able to solubilize higher water content than methyl esters [13].Wang et al.[14]established the thermodynamic model of ethanol–diesel emulsification to investigate the influence of ethanol and emulsifiers on the interfa-cial tension of blends [14].Although many researchers have studied the stability of etha-nol–diesel blends and their effects on the performance of diesel en-gines,the emulsifiers or co-solvents are not widely utilized because of their high cost and great additive content.In this paper,a novel emulsifier for ethanol–diesel blend was developed and the effects of blends on performance and emissions of diesel engine were investigated.2.Materials and methods 2.1.Preparation of emulsifierThe water-in-oil emulsion was prepared with 0#diesel (as oil phase)and water-free ethanol (as water phase).According to the0016-2361/$-see front matter Ó2011Published by Elsevier Ltd.doi:10.1016/j.fuel.2011.06.013Corresponding author.Tel.:+8687138020618702.E-mail addresses:leijilin@ (J.Lei),lzshen@ (L.Shen).theory of‘‘similarity and intermiscibility’’and‘‘hydrophilic–lipophilic balance(HLB)’’[15,16],16reagents were chosen as single emulsifier,including castor oil(B),tea oil(C),biofuel esterif-icated from wasted food(S),fluorine oil(M),butanol(D),octanol (X),acid glyceride(Y),laurel acid glyceride(YU),tung oil(TZ),hex-adecanol(SL),Dodecanol(SE),Stearic acid glyceride(YZ),Tetrahy-drofuran(SQ),Ethyl acetate(YS),Span80(SP)and Tween80(TW).The separation time of the emulsion was measured by watching and observing the natural layer.The emulsion samples were irradi-ated by a single-side parallel lamp and observed from the light-vertical direction.The observation distance is no more than 20cm.If it is clear,transparent and symmetrical,the emulsion is considered an ethanol–diesel blend with good stability.Otherwise, if conglomeration or liquid are observed,the emulsion becomes separated.The unstable ethanol–diesel blend has two layers with obvious interfacialfilm.The delamination degree can be obtained by the separation scale on the test tubes.The standing wait time was10days and the test temperatures were from0to35°C with intervals of5°C.Every test was repeatedfive times and the mean value was shown in the results.2.2.Engine testThe experiment was carried out on a water-cooled,four-stroke, mechanical controlled diesel engine,as shown in Table1.The other experimental devices included hydraulic dynamometer(WE31, China),fuel meter,smoke meter(AVL415,Austria)and exhaust analyzer(AVL CEBII,Austria).The altitude for the test site is 1920m,the atmospheric pressure is81.5kPa and the ambient temperature ranges from20to25°C.During the experiment,the engine was not modified.Every working mode was measuredfive times and the results were determined by an average value.3.Results and discussion3.1.Emulsifying properties of emulsifiers3.1.1.Single emulsifierIn order to indentify the best emulsifiers,various reagents were used to prepare E10(90ml diesel+10ml ethanol+1ml emulsi-fier)and their stability performance is shown in Fig.1.Meanwhile, E15(85ml diesel+15ml ethanol+1.5ml emulsifier)was pre-pared with B,C,S,M,D,X,Y and YU,whose results were illustrated in Fig.2.Due to the quantity of emulsifiers is very small with re-spect to the fuels,the names of E10and E15are used.As shown in Figs.1and2,with decreasing temperatures,the physical stability of the ethanol–diesel blends deteriorated and the phase separation happened last.When castor oil was the emul-sifier for E10,the lowest temperature of phase separation was 10°C and the percent of delamination was2.2%at0°C.The lowest temperature of phase separation for C,S,M,TZ was15°C,20°C for D,X,Y,YU,SL and25°C for the others.When B,C,S and M were used as emulsifiers,a clear,transparent and uniform E15was ob-tained above20°C.Below20°C,however,the phase separation of E15occurred and became obvious with the decreasing temper-atures.At0°C,the percent of delamination was over3.5%.When the ambient temperature decreases,the Brownian mo-tion of molecules is weakened and the surface tension of the liquid increases,which results in an increase in the pressure on the inter-facialfilm.Once the interfacialfilm breaks,the ethanol molecules will break through it and congregate,then the ethanol liquid is formed and the phase separation of ethanol–diesel blends happens.3.1.2.Mixed emulsifiersThrough thefiltration experiment of a single emulsifier,YU,Y, C,M,S,B,D and X had better performances,which were then cho-sen to form the mixed emulsifiers.The selection of and mixture of emulsifiers should follow these principles:the molecular struc-tures of emulsifiers must be complementary and the kinds of func-tional groups must be as various as possible.In this study,eight bicomponent emulsifiers were formed with a volume ratio1:1.These were B and S(BS),TZ and D(DT),YS and SQ(SQYS),M and SL(SLM),C and SE(SEC),YZ and X(XYZ),YU and Span80(SPYU),Y and Tween80(TWY).E10was emulsified with the above emulsifiers and the emulsifying performance was shown in Fig.3.It was observed that the bicomponent emulsifiers perfor-mand better than the single emulsifiers.Among them,BS was the best,with which the occurrence of phase separation was at10°C and the percent of delamination was lower than1.2%at0°C.The percent of delamination’s for the others were more than2%at0°C.Furthermore,the tricomponent emulsifiers were prepared based on BS with a volume ratio1:1:1.These were BS and D (SBD),BS and C(SBC),BS and M(SBM),BS and TZ(SBT),BS and SL(SBE),BS and YZ(SBY),BS and SQ(SBS),BS and Span80(SBSP). Using the above tricomponent emulsifiers,E10and E15were formed and the emulsifying performance is shown in Fig.4.It can be seen that the tricomponent emulsifiers perform better than the bicomponent emulsifiers.Among them,SBD was the best,with which the occurrence of phase separation was at10°C and the per-cent of delamination was lower than1.0%for E10and1.5%for E15 at0°C.Nevertheless,the stability of ethanol–diesel blends at low temperatures with tricomponent emulsifiers was not satisfactory.3.1.3.Development of CLZ-type emulsifierIn order to prevent demulsification(resulting from low temper-atures),the interfacialfilm formed by the emulsifier should have a self-repairing ability,which will allow thefilm to reform after the break and prevent the conglomeration of ethanol molecules.The principle scheme of microcosmic function was shown in Fig.5.Through trial and error,a novel mixed emulsifier,named‘‘CLZ’’, was developed using biofuel,castor oil and other single emulsifiers with a special ratio.With a HLB value of4.1–4.4,the CLZ can keep the physical stability of E10and have the good emulsification of E15in a wide range of temperatures and can emulsify E20(v/v) and E25(v/v)at normal temperatures.Fig.6illustrated the stabil-ity of ethanol–diesel blends with CLZ.At0°C,E10with0.8%CLZ can be kept clear,transparent and uniform after60days of stand-ing.The percent of delamination of E15with1%CLZ is about0.5% at0°C.3.2.Performance and emission characteristics of diesel engineThree kinds of ethanol–diesel blends with additions of CLZ were tested in a diesel engine on an engine test bench in order to inves-tigate their effects on the performance and emissions of a diesel engine.The blends were:(a)CLZ-E5:5ml ethanol+95ml diesel+0.8ml CLZ-type emulsifier;(b)CLZ-E10:10ml etha-nol+90ml diesel+0.8ml CLZ-type emulsifier;(c)CLZ-E15: 15ml ethanol+85ml diesel+1.0ml CLZ-type emulsifier.Table1Specification of diesel engine.Parameters IndexType In-line,4cylinders,natural aspirationDisplacement(L) 2.5Rated power(kW/(r/minÀ1))37/2400Maximum torque(N m/(r/minÀ1))168/1600Compression ratio17.5:1306J.Lei et al./Fuel93(2012)305–3113.2.1.Effects on performanceFig.7shows the break thermal efficiency of diesel,CLZ-E5,CLZ-E10and CLZ-E15at engine speed of1600r/min and2400r/min.It can be seen that the break thermal efficiency of ethanol–diesel blends is higher than that of diesel due to the oxygen content in the blend fuels.Furthermore,the CLZ-E10had the highest break thermal efficiency among the three blends,which indicates that the improvement of break thermal efficiency would not continue with increasing additions of ually there is an optimal ra-tio of ethanol and diesel and the optimal ratio will change accord-ing to the concrete combustion system of engines[17].For the experimental diesel engine the optimal ratio of ethanol and diesel is10%.On one side,due to the low viscosity and boiling point of etha-nol,the temperature and pressure of fuel in the cylinders passes through the gas–liquid phase region of ethanol–diesel blends dur-ing the high-temperature compression process.And then the eth-anol dissolved in the diesel is vaporized,which promotes the atomization of fuel and the formation of an air–fuel mixture and improves the ignition condition.Additionally,the high oxygen con-tent of ethanol can increase the air–fuel ratio and improve the combustion efficiency of blends.Thus,the performance of dieselFig.1.The stability performance of ethanol–diesel blend E10with different single emulsifiers. Fig.2.The stability performance of ethanol–diesel blend E15with different single emulsifiers.engines is improved with the addition of ethanol.On the other side,with higher additions of ethanol,the vaporization of ethanol absorbs a lot of the heat energy,which reduces the temperature in the cylinder and weakens the combustion.Hence,in order to ob-tain the maximum improvement of the engine performance,the ratio of ethanol in blends should be appropriate[17].3.2.2.Effects on gaseous pollutantsThe gaseous emissions of diesel engines fueled with diesel and three ethanol–diesel blends were measured at engine speeds of 1600r/min and2400r/min and the comparison of results are shown in Fig.8.The CO emissions were increased at light loads with additions of ethanol,especially with CLZ-E15,while CO emis-sions were decreased at heavy loads,especially with CLZ-E10.The ethanol–diesel blends reduced the NO x emissions slightly,but there is not significant difference at heavier loads.With the increasing addition of ethanol,the THC emissions increased, especially at low loads.At low speeds and light loads,the high latent heat of vaporiza-tion of ethanol causes a temperature reduction in the cylinder, which prevents the oxidation of CO,resulting in increased CO emissions as the ethanol is increased.At high speeds and heavyFig.3.The stability performance of ethanol–diesel blend E10with different bicomponent emulsifiers. stability performance of ethanol–diesel blends E10and E15with different tricomponent emulsifiers((a)E10Fig.5.The micro-theory of interfacialfilm’s self-repairing.Fig.6.The stability performance of ethanol–diesel blends with emulsifier‘‘CLZ’’(the addition of CLZ are(a)0.4%,(b)0.6%,(c)0.8%and(d)1.0%).parison of performance of diesel engine fueled with diesel and ethanol–diesel blends((a)1600r/min and(b)2400r/min).loads,due to the high temperature in cylinder and oxygen content of ethanol,the oxidation of CO is improved,thus,the CO emissions of ethanol–diesel blends becomes lower than diesel emissions.Too much ethanol,however,may still lead to comparatively low tem-peratures in the cylinder,which deteriorates the oxidation condi-tion of CO[18],so the CO emissions of CLZ-E15are higher than those of ELZ-E10.When using ethanol–diesel blends,the lower temperature in the cylinder also contributes to the lower emissions of NO x.At heavy loads,the slight increase of NO x emissions may be a result of the oxygen content of the ethanol.The chilling of the cylinder wall and resulting lower temperature can lead to higher emissions of HC with ethanol–diesel blends.In summary,the high-er latent heat of vaporization of ethanol and oxygen content of eth-anol are the main reasons for the changes of gaseous emissions.3.2.3.Effects on smoke emissionsThe smoke emissions of diesel engine fueled with diesel and three ethanol–diesel blends were compared in Fig.9at engine speeds of1600r/min and2400r/min.As shown in Fig.9,the smoke emissions decreased with the increasing addition of etha-nol.At heavy loads the extent of the reduction is significant.The oxygen atom is usually connected to carbon atom in oxy-genated fuel and it is difficult to break the bond,which restrains the formation of aromatic hydrocarbon and black carbon.However, the oxygen content of ethanol can provide oxygen atoms in the fuel-rich region and inhibit the formation of smoke,especially at heavy loads[19].At heavy loads,the excess air fuel ratio is low, so the oxygen content of ethanol shows a positive effect on the smoke emissions.Additionally,without sulfur and aromatic hydro-carbon and with lower surface tension and boiling point,ethanol can promote the spray and combustion characteristics of etha-nol–diesel blends and restrain the smoke emissions[20,21].4.ConclusionsThe following conclusions can be drawn from this study:(1)When the ambient temperature is above25°C,ethanol–die-sel blend E10can keep its physical stability with the single emulsifier,such as laurel acid glyceride(YU),acid glyceride (Y),tea oil(C),fluorine oil(M),biofuel esterificated from wasted food(S),castor oil(B),butanol(D)and octanol(X).(2)With the decrease of temperature,ethanol–diesel blendswith a single emulsifier became unstable and the phase sep-aration occurred last.The temperature of phase separation depended on the addition of ethanol and emulsifier.As a sin-Comparison of gaseous emissions of diesel engine fueled with diesel and ethanol–diesel blends((a)1600r/min and(b) Comparison of smoke emissions of diesel engine fueled with diesel and ethanol–diesel blends((a)1600r/min and(b)gle emulsifier,castor oil(B),tea oil(C),biofuel esterificated from wasted food(S)andfluorine oil(M)can reduce the temperature of phase separation of ethanol–diesel blends.(3)The mixed emulsifier by castor oil(B)and biofuel(S)had thebest emulsification performance.A novel emulsifier,named ‘‘CLZ’’was developed based on biofuel,castor oil and other single emulsifiers.With HLB values of4.1–4.4,CLZ can keep the physical stability of E10and have good emulsification of E15in a wide range of temperature,and also can emulsify E20and E25at normal temperatures.(4)With ethanol–diesel blends,the break thermal efficiencywas improved and the equivalent BSFC of diesel engine was reduced.Furthermore,in order to obtain the best engine performance,there was an optimal ratio between ethanol and diesel,which depended on the combustion system of the pared to the diesel,ethanol–diesel blends increased the CO emissions at low loads,but decreased them at high loads.The NO x emissions were reduced slightly and the THC emissions were augmented,especially at low loads.With the increasing addition of ethanol,the smoke emission of diesel engine decreased,especially at heavy loads. 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sbs改性沥青及混合料设计施工技术指南英文版Technical Guidelines for Design and Construction of SBS Modified Asphalt and MixtureIntroductionSBS modified asphalt, a type of asphalt binder modified with styrene-butadiene-styrene (SBS) copolymer, has gained popularity in recent years due to its superior performance in terms of durability, flexibility, and resistance to deformation. This article aims to provide a comprehensive technical guide for the design and construction of SBS modified asphalt and mixture.SBS Modified AsphaltSBS modified asphalt is produced by blending SBS copolymer with conventional asphalt at elevated temperatures. The SBS copolymer acts as a modifier, enhancing the asphalt'sviscoelastic properties and improving its resistance to low-temperature cracking and high-temperature rutting.Mixture DesignWhen designing SBS modified asphalt mixtures, it is crucial to consider factors such as aggregate gradation, asphalt binder content, and mixture volume parameters. The selection of aggregate should prioritize hard, durable, and well-graded materials. The asphalt binder content should be optimized to achieve the desired workability and performance characteristics.Construction TechniquesDuring construction, it is essential to maintain strict control over temperature, mixing, and compaction. The asphalt mixture should be mixed uniformly at elevated temperatures to ensure complete blending of the SBS modifier. Compaction should be carried out promptly to avoid temperature loss and ensure a dense and uniform pavement structure.ConclusionSBS modified asphalt and mixture offer superior performance and durability, making them ideal for highway and airport pavement applications. Following the guidelines provided in this article, designers and constructors can achieve optimal results in terms of pavement performance and safety.中文版SBS改性沥青及混合料设计施工技术指南引言近年来，由于SBS改性沥青在耐久性、柔韧性和抗变形能力方面的卓越表现，其已受到广泛欢迎。

SBS改性乳化沥青技术摘要SBS改性乳化沥青是一种新型的改性沥青技术，它采用的是利用交联聚乙烯异位共聚物(SBS)乳化沥青来改善沥青的性能。

本文详细介绍了SBS改性乳化沥青技术的工艺原理和优势，并分析了改性沥青的几种基本特性，如抗滑移性、抗渗透性、韧性、耐久性等。

最后，本文对SBS改性乳化沥青技术的应用进行了综述，指出了SBS改性乳化沥青技术的发展趋势和前景。

关键词：SBS改性乳化沥青；性能；应用；发展趋势IntroductionSBS modified emulsified asphalt is a new modified asphalt technology, which uses styrene-butadiene-styrene block copolymers (SBS) emulsified asphalt to improve the performance of asphalt. This paper introduces the process principle and advantages of SBS modified emulsified asphalt technology in detail, and analyzes several basic properties of modified asphalt, such as anti-skid, anti-permeability, toughness, durability, etc. Finally, this paper reviews the application of SBS modified emulsified asphalt technology and points out the development trend and prospects of this technology.I. Process Principle and Advantages of SBS Modified Emulsified AsphaltThe main advantages of SBS modified emulsified asphalt technology are as follows: 1) It can improve the stability of asphalt emulsion, reduce the loss of asphalt, and increase the cohesion of asphalt surface; 2) It can improve the impermeability and waterproofing of asphalt, and reduce the damage caused by the penetration of water; 3) It cansignificantly improve the anti-skid performance of asphalt, and can also improve the wear resistance of asphalt; 4) It can reduce the amount of asphalt used and improve the cost performance of asphalt pavement; 5) It can significantly reduce the odour from the asphalt.II. Basic Properties of Modified Asphalt1) Anti-SkidThe anti-skid properties of SBS modified emulsified asphalt are mainly related to the structure and content of SBS, the form of asphalt emulsion, and the dosage amount of SBS. The higher the content of styrene-butadiene-styrene block copolymer, the better its anti-skid performance. With the increase of SBS content, the anti-skid performance of asphalt increases significantly.2) Anti-PermeabilityThe anti-permeability of SBS modified emulsified asphalt depends mainly on the type, content and structure of SBS material. The higher the content of styrene-butadiene-styreneblock copolymer, the better its anti-permeability. With the increase of SBS content, the anti-permeability of asphalt increases significantly.3) ToughnessThe toughness of SBS modified emulsified asphalt depends mainly on the type, content and。