回弹法检测混凝土强度自动计算表测区混凝土强度换算表回弹值修正值

混凝土回弹值与强度关系换算表
混凝土回弹值是一种用于评估混凝土强度的非破坏性检测方法。

回弹值是通过测量混凝土表面使用回弹锤敲击后的反弹高度来确定的。

根据混凝土回弹值和强度之间的关系，可以进行强度的估计。

混凝土回弹值与强度之间的关系
混凝土回弹值与强度之间存在一定的相关性。

然而，由于混凝
土的成分、配合比、养护条件等因素的不同，回弹值与强度之间的
关系并不是线性的。

为了将混凝土回弹值转换为强度估计，需要使用换算表。

本文
档提供了一份简单的混凝土回弹值与强度关系换算表，以便在实际
工程中使用。

混凝土回弹值与强度关系换算表
请注意，该换算表仅供参考，实际结果可能会受到其他因素的影响。

在进行混凝土强度估计时，建议结合实际工程情况和其他测试方法进行综合评估。

结论
混凝土回弹值与强度之间的关系是复杂的，但通过使用换算表可以进行一定程度的强度估计。

然而，在实际工程中，建议结合多种测试方法和实际情况进行强度评估，以获得更准确的结果。

12345678910111213143232343232343232343439313239313239313232323330323330323330303336403336403336404034343034343034343030403031403031403031313631363631363631363636313436313436313434303440303440303440403236313236313236313132333032333032333030303134303134303134343131413131413131414131374031374031374040363033363033363033333130323130323130323232.932.133.732.932.133.732.932.133.733.7////0.00.00.00.00.00.00.00.00.00.0////32.932.133.732.932.133.732.932.133.733.7////0.00.00.00.00.00.00.00.00.00.0////32.932.133.732.932.133.732.932.133.733.7////27.426.128.727.426.128.727.426.128.728.7////29.828.531.329.828.531.329.828.531.331.3////29.828.531.329.828.531.329.828.531.331.3////60%57%63%60%57%63%60%57%63%63%////回弹法检测混凝土强度计算书建设单位报告编号施工日期2012.10.23报告日期27天龄期工程部位回弹仪型号/编号施工单位工程名称金寨路特大桥46#墩9块混凝土试块试验日期2012.11.19检验依据JGJ/T23-2011炭化深度d m0.5测点个数n10混凝土强度等级F cuC50混凝土输送方式K泵送浇注面R b a /R t a侧面修正值（Ra)检测角度R ma 水平4567 测点数弹击数12312131415891011检测角度修正系数检测角度修正结果浇注面修正系数浇注面修正结果16混凝土强度回弹值修正计算平均值评定结果单个等级平均值m f c cu标准差sf c cu非泵送强度换算值泵送砼强度换算值混凝土强度推算值(f cu,e )的确定达到设计等级%mfc cu =sfc cu =31.3当N>10组时f cu =最大值f c cu,max强度推算值f cu,e50.0最小值f c cu,minFcu,e=Mfccu-1.645SFccu56%检查强度 不合格30.0批准审核试验记录计算1.228.528.0。

回弹法：
回弹法是用一弹簧驱动的重锤，通过弹击杆，弹击混凝土表面，并测出重锤被反弹回来的距离，以回弹值作为与强度相关的指标，来推定混凝土强度的一种方法。

回弹法检测混凝土抗压强度技术规程：
《回弹法检测混凝土抗压强度技术规程》是2011年7月1日中国建筑工业出版社出版的图书，作者是陕西省建筑科学研究院。

内容简介：
本规程的主要技术内容是：1.总则；2.术语和符号；3.回弹仪；
4.检测技术；
5.回弹值计算；
6.测强曲线；
7.混凝土强度的计算。

本规程经住房和城乡建设部以公告第1000号批准、发布，自2011年12月1日起实施。

原《回弹法检测混凝土抗压强度技术规程》JGJ/T23-2001同时废止
目录：
1 总则；
2 术语和符号；
3 回弹仪；
4 检测技术；
5 回弹值计算；
6 测强曲线；
7 混凝土强度的计算。

附录A 测区混凝土强度换算表；
附录B 泵送混凝土测区强度换算表；
附录C 非水平方向检测时的回弹值修正值；附录D 不同浇筑面的回弹值修正值；
附录E 地区和专用测强曲线的制定方法；附录F 回弹法检测混凝土抗压强度报告。

本规程用词说明。

引用标准名录。

附：条文说明。

附录B 测区泵送混凝土强度换算表之相礼和热创作表B 测区泵送混凝土强度换算表
60MPa.
表中数值是根据曲线方程)
9400
(
.110
.0
0173
f-
=计算.
.0dm
034488
R
附录C 非程度方向检测时的回弹值修正值
表C 非程度方向检测时的回弹值修正值
R小于20或大于50时，分别按20或50查表；
α
m
2 表中未列入的相应于
R的修正值αm R，可用内插法求得，
α
m
精确至0.1.
附录D 分歧浇筑面的回弹值修正值
表D 分歧浇筑面的回弹值修正值
t
R或b m R小于20或大于50时，分别按20或50查表；
m
2表中有关混凝土浇筑概况的修正系数，是指一样平常原浆抹面的修正值；
3表中有关混凝土浇筑底面的修正系数，是指构件底面与正面采取同一类模板在正常浇筑状况下的修正值；
4表中未列入相应于t
R或b m R的t a R和b a R，可用内插法求得，
m
精确至0.1.。

混凝土：
混凝土，简称为"砼（tóng）"：是指由胶凝材料将集料胶结成整体的工程复合材料的统称。

通常讲的混凝土一词是指用水泥作胶凝材料，砂、石作集料；与水（可含外加剂和掺合料）按一定比例配合，经搅拌而得的水泥混凝土，也称普通混凝土，它广泛应用于土木工程。

回弹法：
回弹法是用一弹簧驱动的重锤，通过弹击杆，弹击混凝土表面，并测出重锤被反弹回来的距离，以回弹值作为与强度相关的指标，来推定混凝土强度的一种方法。

回弹法检测混凝土抗压强度技术规程：
《回弹法检测混凝土抗压强度技术规程》是2011年7月1日中国建筑工业出版社出版的图书，作者是陕西省建筑科学研究院。

内容简介：
本规程的主要技术内容是：1.总则；2.术语和符号；3.回弹仪；
4.检测技术；
5.回弹值计算；
6.测强曲线；
7.混凝土强度的计算。

本规程经住房和城乡建设部以公告第1000号批准、发布，自2011年12月1日起实施。

原《回弹法检测混凝土抗压强度技术规程》JGJ/T23-2001同时废止
目录：
1 总则；
2 术语和符号；
3 回弹仪；
4 检测技术；
5 回弹值计算；
6 测强曲线；
7 混凝土强度的计算。

附录A 测区混凝土强度换算表；
附录B 泵送混凝土测区强度换算表；
附录C 非水平方向检测时的回弹值修正值；附录D 不同浇筑面的回弹值修正值；
附录E 地区和专用测强曲线的制定方法；附录F 回弹法检测混凝土抗压强度报告。

本规程用词说明。

引用标准名录。

附：条文说明。

12345678910111213143438363838363635403837363634393437343835383838383938363436323837343836383934383840363238383538354232403732363832383837333434323938353835393636383936363738343838353835373834393338343437343842313836423732373536383738353537383736403837363536383238373436373836353538373736374038363736383738343536384037343937383437323636373836.637.235.836.737.635.837.735.137.536.0////0.00.00.00.00.00.00.00.00.00.0////36.637.235.836.737.635.837.735.137.536.0////0.00.00.00.00.00.00.00.00.00.0////36.637.235.836.737.635.837.735.137.536.0////34.835.933.335.236.733.337.132.136.733.6////37.238.435.737.639.235.739.634.539.236.0////37.238.435.737.639.235.739.634.539.236.0////106%110%102%107%112%102%113%99%112%103%////批准审核试验记录计算最小值f c cu,minFcu,e=Mfccu-1.645SFccu98%37.3 1.834.534.3检查强度 合格mfc cu =sfc cu =平均值m f c cu标准差sf c cu最大值f c cu,max强度推算值f cu,e达到设计等级%39.6当N>10组时f cu =35.0非泵送强度换算值泵送砼强度换算值混凝土强度推算值(f cu,e )的确定评定结果单个等级混凝土强度回弹值修正计算平均值检测角度修正系数检测角度修正结果浇注面修正系数浇注面修正结果121314151667891011 测点数弹击数12345混凝土输送方式K泵送浇注面R b a /R t a侧面修正值（Ra)测点个数n10混凝土强度等级F cuC35检测角度R ma 水平炭化深度d m0.0工程部位29#墩墩身回弹仪型号/编号检验依据JGJ/T23-2011施工单位中铁港航局工程名称跨临连高速、沭北运河特大桥试验日期2014年9月23日回弹法检测混凝土强度计算书建设单位报告编号报告日期。

23.0--10.010.010.110.210.310.310.410.510.624.010.610.610.710.810.911.011.111.111.211.311.425.011.411.411.511.611.711.811.912.012.112.112.226.012.212.312.412.512.512.612.712.812.913.013.127.013.013.113.213.313.413.513.613.713.813.914.028.013.914.014.114.214.314.414.514.614.714.814.929.014.814.915.015.115.215.315.415.615.715.815.930.015.715.815.916.016.216.316.416.516.616.816.931.016.616.716.917.017.117.317.417.517.617.817.932.017.617.717.818.018.118.218.418.518.718.818.933.018.618.718.819.019.119.319.419.619.719.820.034.019.619.719.920.020.220.320.520.620.820.921.135.020.620.820.921.121.221.421.521.721.922.022.236.021.721.822.022.122.322.522.622.823.023.123.337.022.722.923.123.223.423.623.823.924.124.324.538.023.824.024.224.424.624.724.925.125.325.525.739.024.925.125.325.525.725.926.126.326.526.726.940.026.126.326.526.726.927.127.327.527.727.928.141.027.327.527.727.928.128.328.528.728.929.129.342.028.428.728.929.129.329.529.730.030.230.430.643.029.729.930.130.330.630.831.031.231.531.731.944.030.931.131.331.631.832.132.332.532.833.033.245.032.132.432.632.933.133.433.633.934.134.334.646.033.433.733.934.234.434.734.935.235.435.736.047.034.735.035.235.535.836.036.336.636.837.137.448.036.036.336.636.837.137.437.737.938.238.538.849.037.437.637.938.238.538.839.139.439.639.940.250.038.739.039.339.639.940.240.540.841.141.441.751.040.140.440.741.041.341.641.942.242.542.943.252.041.541.842.142.442.843.143.443.744.044.444.753.042.943.243.643.944.244.644.945.245.545.946.254.044.444.745.045.445.746.146.446.747.147.447.855.045.846.246.546.947.247.647.948.348.649.049.321.0-----------4.004.263.984.243.964.223.944.203.924.183.904.163.884.143.844.103.824.083.804.06表C.0.1 测区混凝土抗压强度换算表（卵石）续表C.0.13.864.1222.010.010.010.110.210.210.310.410.510.510.610.723.010.810.910.911.011.111.211.211.311.411.511.624.011.611.711.811.912.012.012.112.212.312.412.525.012.512.612.712.812.912.913.013.113.213.313.426.013.413.513.613.713.813.914.014.114.214.314.427.014.314.414.514.614.714.814.915.015.115.215.328.015.315.415.515.615.715.815.916.016.116.316.429.016.216.416.516.616.716.816.917.117.217.317.430.017.317.417.517.617.717.918.018.118.218.418.531.018.318.418.518.718.818.919.119.219.319.519.632.019.319.519.619.719.920.020.220.320.420.620.733.020.420.620.720.921.021.121.321.421.621.721.934.021.521.721.822.022.122.322.422.622.822.923.135.022.722.823.023.123.323.523.623.824.024.124.336.023.824.024.224.324.524.724.825.025.225.425.537.025.025.225.425.525.725.926.126.226.426.626.838.026.226.426.626.827.027.127.327.527.727.928.139.027.427.627.828.028.228.428.628.829.029.229.440.028.728.929.129.329.529.729.930.130.330.530.841.030.030.230.430.630.831.031.331.531.731.932.142.031.331.531.732.032.232.432.632.833.133.333.543.032.632.833.133.333.533.834.034.234.534.734.944.034.034.234.434.734.935.235.435.735.936.236.445.035.335.635.836.136.436.636.937.137.437.637.946.036.737.037.337.537.838.138.338.638.839.139.447.038.238.438.739.039.339.539.840.140.440.640.948.039.639.940.240.540.741.041.341.641.942.242.549.041.141.441.742.042.342.642.843.143.443.744.050.042.642.943.243.543.844.144.444.745.045.345.651.044.144.444.745.045.445.746.046.346.646.947.352.045.646.046.346.646.947.347.647.948.348.648.953.047.247.547.948.248.648.949.249.649.950.250.654.048.849.149.549.850.250.550.951.251.651.952.355.050.450.851.151.551.852.252.652.953.353.754.020.0-----------21.010.010.110.210.210.310.410.410.510.610.610.722.010.911.011.011.111.211.311.311.411.511.611.623.011.811.911.912.012.112.212.312.312.412.512.624.012.712.812.913.013.113.113.213.313.413.513.625.013.713.813.813.914.014.114.214.314.414.514.64.524.504.484.464.444.424.404.364.344.32续表C.0.14.3826.014.614.714.814.915.015.115.215.315.415.515.627.015.715.815.916.016.116.216.316.416.516.616.728.016.716.816.917.017.117.317.417.517.617.717.829.017.817.918.018.118.218.418.518.618.718.819.030.018.919.019.119.219.419.519.619.719.920.020.131.020.020.120.320.420.520.720.820.921.121.221.332.021.121.321.421.621.721.922.022.122.322.422.633.022.322.522.622.822.923.123.223.423.523.723.834.023.523.723.924.024.224.324.524.624.825.025.135.024.824.925.125.325.425.625.825.926.126.326.436.026.026.226.426.626.726.927.127.327.427.627.837.027.327.527.727.928.128.328.428.628.829.029.238.028.728.829.029.229.429.629.830.030.230.430.639.030.030.230.430.630.831.031.231.431.631.832.040.031.431.631.832.032.232.432.632.933.133.333.541.032.833.033.233.433.733.934.134.334.534.835.042.034.234.434.734.935.135.435.635.836.036.336.543.035.735.936.136.436.636.937.137.337.637.838.144.037.137.437.637.938.138.438.638.939.139.439.645.038.638.939.239.439.739.940.240.540.741.041.246.040.240.440.741.041.341.541.842.142.342.642.947.041.742.042.342.642.943.143.443.744.044.344.548.043.343.643.944.244.544.845.145.445.645.946.249.044.945.245.545.846.146.446.747.047.347.648.050.046.646.947.247.547.848.148.448.849.149.449.751.048.248.548.949.249.549.850.250.550.851.151.552.049.950.250.650.951.251.651.952.352.652.953.353.051.652.052.352.753.053.353.754.054.454.755.154.053.453.754.154.454.855.155.555.956.256.656.955.055.155.555.956.256.657.057.357.758.158.558.820.010.010.110.110.210.310.310.410.510.510.610.621.010.911.011.111.111.211.311.311.411.511.511.622.011.911.912.012.112.212.212.312.412.512.512.623.012.812.913.013.113.113.213.313.413.513.613.624.013.813.914.014.114.214.314.414.414.514.614.725.014.915.015.015.115.215.315.415.515.615.715.826.015.916.016.116.216.316.416.516.616.716.816.927.017.017.117.217.417.517.617.717.817.918.018.128.018.218.318.418.518.618.718.819.019.119.219.329.019.319.419.619.719.819.920.120.220.320.420.54.784.764.744.724.704.684.664.624.604.58续表C.0.14.6430.020.520.620.820.921.021.221.321.421.621.721.831.021.721.922.022.222.322.422.622.722.823.023.132.023.023.123.323.423.623.723.924.024.224.324.533.024.324.424.624.724.925.125.225.425.525.725.834.025.625.825.926.126.226.426.626.726.927.127.235.026.927.127.327.527.627.828.028.128.328.528.736.028.328.528.728.929.029.229.429.629.829.930.137.029.729.930.130.330.530.730.931.131.231.431.638.031.231.431.631.832.032.232.432.532.732.933.139.032.632.833.033.333.533.733.934.134.334.534.740.034.134.334.634.835.035.235.435.635.936.136.341.035.735.936.136.336.636.837.037.237.537.737.942.037.237.437.737.938.138.438.638.939.139.339.643.038.839.039.339.539.840.040.340.540.841.041.244.040.440.740.941.241.441.741.942.242.442.743.045.042.042.342.642.843.143.443.743.944.244.444.746.043.744.044.344.544.845.145.445.645.946.246.547.045.445.746.046.346.546.847.147.447.748.048.348.047.147.447.748.048.348.648.949.249.549.850.149.048.949.249.549.850.150.450.751.051.351.752.050.050.651.051.351.651.952.252.652.953.253.553.951.052.552.853.153.453.854.154.454.855.155.455.852.054.354.655.055.355.756.056.356.757.057.457.753.056.156.556.957.257.657.958.358.659.059.459.754.058.058.458.859.159.559.960.260.661.061.361.755.060.060.360.761.161.561.862.262.663.063.463.820.010.810.911.011.011.111.211.211.311.411.411.521.011.811.912.012.012.112.212.212.312.412.512.522.012.812.913.013.113.113.213.313.413.513.513.623.013.914.014.014.114.214.314.414.514.514.614.724.015.015.115.115.215.315.415.515.615.715.815.925.016.116.216.316.416.516.616.716.816.917.017.126.017.217.317.517.617.717.817.918.018.118.218.327.018.418.518.718.818.919.019.119.219.319.419.528.019.719.819.920.020.120.220.420.520.620.720.829.020.921.021.221.321.421.521.721.821.922.022.230.022.222.322.522.622.722.923.023.123.323.423.531.023.523.723.824.024.124.224.424.524.724.825.032.024.925.025.225.325.525.625.825.926.126.226.45.045.025.004.984.964.944.924.904.884.864.84续表C.0.133.026.326.526.626.826.927.127.227.427.627.727.934.027.727.928.028.228.428.528.728.929.029.229.435.029.229.429.529.729.930.030.230.430.630.830.936.030.730.931.031.231.431.631.832.032.132.332.537.032.232.432.632.833.033.233.333.533.733.934.138.033.733.934.134.434.634.835.035.235.435.635.839.035.335.535.836.036.236.436.636.837.037.237.540.037.037.237.437.637.838.138.338.538.738.939.241.038.638.839.139.339.539.840.040.240.540.740.942.040.340.540.841.041.241.541.742.042.242.542.743.042.042.242.542.743.043.343.543.844.044.344.544.043.744.044.344.544.845.045.345.645.846.146.445.045.545.846.146.346.646.947.147.447.748.048.246.047.347.647.948.248.448.749.049.349.649.950.247.049.249.449.750.050.350.650.951.251.551.852.148.051.051.351.651.952.252.552.853.253.553.854.149.052.953.253.553.954.254.554.855.155.455.856.150.054.855.255.555.856.156.556.857.157.557.858.151.056.857.157.557.858.158.558.859.259.559.960.252.058.859.159.559.860.260.560.961.261.661.962.353.060.861.261.561.962.262.663.063.363.764.164.454.062.863.263.664.064.364.765.165.565.866.266.655.064.965.365.766.166.566.867.267.668.068.468.820.011.711.811.811.912.012.012.112.212.212.312.421.012.712.812.913.013.013.113.213.313.313.413.522.013.813.914.014.114.214.214.314.414.514.514.623.015.015.115.115.215.315.415.515.615.615.715.824.016.116.216.316.416.516.616.716.816.917.017.125.017.317.417.517.617.717.817.918.018.118.218.326.018.618.718.818.919.019.119.219.319.419.519.727.019.920.020.120.220.320.420.620.720.820.921.028.021.221.321.421.621.721.821.922.022.222.322.429.022.622.722.822.923.123.223.323.523.623.723.830.024.024.124.224.424.524.624.824.925.025.225.331.025.425.525.725.826.026.126.226.426.526.726.832.026.827.027.227.327.527.627.827.928.128.228.433.028.428.528.728.829.029.229.329.529.629.830.034.029.930.130.230.430.630.730.931.131.231.431.635.031.531.631.832.032.232.432.532.732.933.133.336.033.133.333.433.633.834.034.234.434.634.834.95.305.285.265.245.225.205.185.165.145.125.10续表C.0.137.034.734.935.135.335.535.735.936.136.336.536.738.036.436.636.837.037.237.437.637.838.038.238.539.038.138.338.538.739.039.239.439.639.840.040.340.039.840.140.340.540.741.041.241.441.741.942.141.041.641.942.142.342.642.843.043.343.543.844.042.043.443.743.944.244.444.744.945.245.445.745.943.045.345.545.846.046.346.646.847.147.347.647.944.047.247.447.748.048.248.548.849.049.349.649.845.049.149.349.649.950.250.550.751.051.351.651.946.051.051.351.651.952.252.552.853.053.353.653.947.053.053.353.653.954.254.554.855.155.455.756.048.055.055.355.655.956.356.656.957.257.557.858.149.057.157.457.758.058.458.759.059.359.660.060.350.059.159.559.860.160.560.861.161.561.862.262.551.061.261.661.962.362.663.063.363.764.064.464.752.063.463.764.164.564.865.265.565.966.366.667.053.065.565.966.366.767.067.467.868.268.568.969.354.067.768.168.568.969.369.7-----55.070.0----------20.010.110.210.310.310.410.510.610.710.810.911.021.010.810.911.011.111.211.311.411.511.611.711.822.011.511.611.711.811.912.012.112.212.312.512.623.012.312.412.512.612.712.812.913.013.113.313.424.013.013.213.313.413.513.613.713.814.014.114.225.013.813.914.114.214.314.414.514.714.814.915.026.014.614.714.915.015.115.215.415.515.615.815.927.015.415.515.715.815.916.116.216.316.516.616.828.016.216.316.516.616.816.917.117.217.417.517.629.017.017.217.317.517.617.817.918.118.218.418.530.017.918.018.218.318.518.618.819.019.119.319.431.018.718.919.019.219.419.519.719.920.020.220.432.019.619.719.920.120.320.420.620.820.921.121.333.020.420.620.821.021.121.321.521.721.922.122.234.021.321.521.721.922.122.222.422.622.823.023.24.003.983.963.943.90 3.923.883.86表C.0.2 测区混凝土抗压强度换算表（碎石）3.843.823.80注：1、表内未列数值可采用内插法求得，精确至0.1MPa；2、表中V a （km/s）为修正后的测区声速代表值，R a 为修正后的测区回弹代表值3、采用对测和角测时，表中Va用V代替；当在侧面水平回弹时，表中Ra用R代替4、f c cu （MPa）为测区混凝土抗压强度换算值。

非泵送测区混凝土强度换算表f c cu,i (Mpa)平均测区混凝土强度换算值平均碳化深度值 d m(mm)(新浇筑砼3个月内碳化度视为0）回弹值R m 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 ≥6.0 20.0 10.3 10.120.1 10.4 10.220.2 10.5 10.3 10.020.3 10.6 10.4 10.120.4 10.7 10.5 10.220.5 10.9 10.7 10.320.6 11.0 10.8 10.4 10.120.7 11.1 10.9 10.5 10.220.8 11.2 11.0 10.6 10.320.9 11.3 11.1 10.7 10.421.0 11.4 11.2 10.8 10.5 10.021.1 11.5 11.3 10.9 10.6 10.121.2 11.6 11.4 11.0 10.7 10.221.3 11.7 11.5 11.1 10.8 10.321.4 11.8 11.6 11.2 10.9 10.4 10.021.5 11.9 11.7 11.3 11.0 10.5 10.121.6 12.0 11.8 11.4 11.0 10.6 10.221.7 12.2 12.0 11.6 11.2 10.7 10.421.8 12.3 12.1 11.7 11.3 10.8 10.5 10.121.9 12.4 12.2 11.8 11.4 10.9 10.6 10.222.0 12.5 12.2 11.9 11.5 11.0 10.6 10.222.1 12.6 12.3 12.0 11.6 11.1 10.7 10.322.2 12.7 12.4 12.1 11.7 11.2 10.8 10.4 10.022.3 12.9 12.6 12.3 11.9 11.3 10.9 10.6 10.222.4 13.0 12.7 12.4 12.0 11.4 11.0 10.7 10.3 10.022.5 13.1 12.8 12.5 12.1 11.5 11.1 10.8 10.4 10.122.6 13.2 12.9 12.5 12.1 11.6 11.2 10.8 10.4 10.222.7 13.3 13.0 12.6 12.2 11.7 11.3 10.9 10.5 10.322.8 13.4 13.1 12.7 12.3 11.8 11.4 11.0 10.6 10.322.9 13.6 13.3 12.9 12.5 12.0 11.5 11.1 10.7 10.423.0 13.7 13.4 13.0 12.6 12.1 11.6 11.2 10.8 10.5 10.123.1 13.8 13.5 13.1 12.7 12.2 11.7 11.3 10.9 10.6 10.223.2 13.9 13.6 13.2 12.8 12.2 11.8 11.4 11.0 10.7 10.3 10.023.3 14.0 13.7 13.3 12.9 12.3 11.9 11.5 11.1 10.8 10.4 10.123.4 14.1 13.8 13.4 13.0 12.4 12.0 11.6 11.2 10.9 10.4 10.223.5 14.3 14.0 13.6 13.1 12.6 12.1 11.7 11.3 11.0 10.6 10.323.6 14.4 14.1 13.7 13.2 12.7 12.2 11.8 11.4 11.1 10.7 10.4 10.123.7 14.5 14.2 13.8 13.3 12.8 12.3 11.9 11.5 11.2 10.8 10.5 10.223.8 14.6 14.3 13.9 13.4 12.8 12.4 12.0 11.5 11.2 10.8 10.5 10.223.9 14.8 14.5 14.1 13.6 13.0 12.6 12.1 11.7 11.4 10.9 10.6 10.324.0 14.9 14.6 14.2 13.7 13.1 12.7 12.2 11.8 11.5 11.0 10.7 10.4 10.1平均碳化深度值 d m(mm)(新浇筑砼3个月内碳化度视为0）回弹值R m0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 ≥6.0 24.1 15.0 14.7 14.3 13.8 13.2 12.8 12.3 11.9 11.6 11.1 10.8 10.5 10.2 24.2 15.1 14.8 14.3 13.9 13.3 12.8 12.4 11.9 11.6 11.2 10.9 10.6 10.3 24.3 15.3 15.0 14.5 14.1 13.5 13.0 12.5 12.1 11.8 11.3 11.0 10.7 10.4 24.4 15.4 15.1 14.6 14.2 13.6 13.1 12.6 12.2 11.9 11.4 11.1 10.8 10.4 24.5 15.5 15.2 14.7 14.3 13.7 13.2 12.7 12.3 12.0 11.5 11.2 10.9 10.5 24.6 15.6 15.3 14.8 14.4 13.7 13.3 12.8 12.3 12.0 11.5 11.2 10.9 10.6 24.7 15.8 15.5 15.0 14.5 13.9 13.4 12.9 12.5 12.1 11.7 11.3 11.0 10.7 24.8 15.9 15.6 15.1 14.6 14.0 13.5 13.0 12.6 12.2 11.8 11.4 11.1 10.724.9 16.1 15.8 15.3 14.8 14.2 13.7 13.2 12.7 12.4 11.9 11.6 11.2 10.825.0 16.2 15.9 15.4 14.9 14.3 13.8 13.3 12.8 12.5 12.0 11.7 11.3 10.9 25.1 16.3 16.0 15.5 15.0 14.4 13.9 13.4 12.9 12.6 12.1 11.8 11.4 11.0 25.2 16.4 16.1 15.6 15.1 14.4 13.9 13.4 13.0 12.6 12.1 11.8 11.5 11.0 25.3 16.6 16.3 15.8 15.3 14.6 14.1 13.6 13.1 12.8 12.3 11.9 11.6 11.1 25.4 16.7 16.4 15.9 15.4 14.7 14.2 13.7 13.2 12.9 12.4 12.0 11.7 11.2 25.5 16.8 16.5 16.0 15.6 14.8 14.3 13.8 13.3 13.0 12.5 12.1 11.8 11.3 25.6 16.9 16.6 16.1 15.7 14.9 14.4 13.9 13.4 13.0 12.5 12.2 11.8 11.3 25.7 17.1 16.8 16.2 15.8 15.0 14.5 14.0 13.5 13.1 12.6 12.3 11.9 11.4 25.8 17.2 16.9 16.3 15.8 15.1 14.6 14.1 13.6 13.2 12.7 12.4 12.0 11.525.9 17.4 17.1 16.5 16.0 15.3 14.8 14.3 13.7 13.4 12.9 12.5 12.1 11.626.0 17.5 17.2 16.6 16.1 15.4 14.9 14.4 13.8 13.5 13.0 12.6 12.2 11.6 26.1 17.7 17.3 16.8 16.3 15.6 15.0 14.5 13.9 13.6 13.1 12.7 12.3 11.7 26.2 17.8 17.4 16.9 16.4 15.7 15.1 14.6 14.0 13.7 13.2 12.8 12.4 11.8 26.3 17.9 17.5 17.0 16.5 15.8 15.2 14.7 14.1 13.8 13.3 12.9 12.5 11.9 26.4 18.0 17.6 17.1 16.6 15.8 15.3 14.8 14.2 13.9 13.3 13.0 12.6 12.0 26.5 18.2 17.8 17.3 16.7 16.0 15.5 14.9 14.3 14.0 13.4 13.1 12.7 12.1 26.6 18.3 17.9 17.4 16.8 16.1 15.6 15.0 14.4 14.1 13.5 13.2 12.8 12.1 26.7 18.5 18.1 17.6 17.0 16.3 15.7 15.2 14.5 14.2 13.7 13.3 12.9 12.2 26.8 18.6 18.2 17.7 17.1 16.4 15.8 15.3 14.6 14.3 13.8 13.4 12.9 12.326.9 18.8 18.4 17.9 17.3 16.5 16.0 15.4 14.7 14.5 13.9 13.5 13.0 12.427.0 18.9 18.5 18.0 17.4 16.6 16.1 15.5 14.8 14.6 14.0 13.6 13.1 12.4 27.1 19.0 18.6 18.1 17.5 16.7 16.2 15.6 14.9 14.7 14.1 13.7 13.2 12.5 27.2 19.1 18.7 18.1 17.6 16.8 16.2 15.7 15.0 14.7 14.1 13.8 13.3 12.6 27.3 19.3 18.9 18.3 17.7 16.9 16.3 15.8 15.1 14.8 14.2 13.9 13.4 12.7 27.4 19.4 19.0 18.4 17.8 17.0 16.4 15.9 15.2 14.9 14.3 14.0 13.4 12.7 27.5 19.6 19.2 18.6 17.9 17.1 16.5 16.0 15.3 15.0 14.4 14.1 13.5 12.8 27.6 19.7 19.3 18.7 18.0 17.2 16.6 16.1 15.4 15.1 14.5 14.1 13.6 12.9 27.7 19.9 19.5 18.9 18.1 17.3 16.7 16.2 15.5 15.2 14.6 14.2 13.7 13.0 27.8 20.0 19.6 19.0 18.2 17.4 16.8 16.3 15.6 15.3 14.7 14.2 13.7 13.027.9 20.2 19.7 19.1 18.3 17.5 16.9 16.4 15.7 15.4 14.8 14.3 13.8 13.128.0 20.3 19.7 19.2 18.4 17.6 17.0 16.5 15.8 15.4 14.8 14.4 13.9 13.2 28.1 20.5 19.9 19.4 18.5 17.7 17.1 16.6 15.9 15.5 14.9 14.5 14.0 13.3 28.2 20.6 20.0 19.5 18.6 17.8 17.2 16.7 16.0 15.6 15.0 14.6 14.0 13.3 28.3 20.8 20.2 19.6 18.7 17.9 17.3 16.8 16.1 15.7 15.1 14.7 14.1 13.4平均碳化深度值 d m(mm)(新浇筑砼3个月内碳化度视为0）回弹值R m0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 ≥6.0 28.4 20.9 20.3 19.7 18.8 18.0 17.4 16.9 16.2 15.8 15.2 14.8 14.2 13.5 28.5 21.1 20.5 19.9 19.0 18.1 17.5 17.0 16.3 15.9 15.3 14.9 14.3 13.6 28.6 21.2 20.6 20.0 19.1 18.2 17.6 17.1 16.4 16.0 15.4 15.0 14.3 13.6 28.7 21.4 20.8 20.1 19.3 18.4 17.7 17.2 16.5 16.1 15.5 15.1 14.4 13.7 28.8 21.5 20.9 20.2 19.4 18.5 17.8 17.3 16.6 16.2 15.6 15.2 14.5 13.828.9 21.7 21.0 20.4 19.5 18.6 18.0 17.4 16.7 16.3 15.7 15.3 14.6 13.929.0 21.8 21.1 20.5 19.6 18.7 18.1 17.5 16.8 16.4 15.8 15.4 14.6 13.9 29.1 22.0 21.3 20.7 19.8 18.9 18.2 17.6 16.9 16.5 15.9 15.5 14.7 14.0 29.2 22.1 21.4 20.8 19.9 19.0 18.3 17.7 17.0 16.6 16.0 15.6 14.8 14.1 29.3 22.3 21.6 21.0 20.1 19.2 18.5 17.8 17.1 16.7 16.1 15.7 14.9 14.2 29.4 22.4 21.7 21.1 20.2 19.3 18.6 17.9 17.2 16.8 16.2 15.8 15.0 14.2 29.5 22.6 21.9 21.2 20.3 19.4 18.7 18.1 17.4 16.9 16.3 15.9 15.1 14.3 29.6 22.7 22.0 21.3 20.4 19.5 18.8 18.2 17.5 17.0 16.4 16.0 15.1 14.4 29.7 22.9 22.2 21.5 20.6 19.7 19.0 18.3 17.6 17.1 16.5 16.1 15.2 14.5 29.8 23.0 22.3 21.6 20.7 19.8 19.1 18.4 17.7 17.2 16.6 16.2 15.3 14.529.9 23.2 22.5 21.8 20.9 19.9 19.2 18.5 17.8 17.3 16.7 16.3 15.4 14.630.0 23.3 22.6 21.9 21.0 20.0 19.3 18.6 17.9 17.4 16.8 16.4 15.4 14.7 30.1 23.5 22.8 22.1 21.1 20.2 19.5 18.8 18.1 17.5 16.9 16.5 15.5 14.8 30.2 23.6 22.9 22.2 21.2 20.3 19.6 18.9 18.2 17.6 17.0 16.6 15.6 14.9 30.3 23.8 23.1 22.4 21.4 20.5 19.7 19.0 18.3 17.7 17.1 16.7 15.7 15.0 30.4 23.9 23.2 22.5 21.5 20.6 19.8 19.1 18.4 17.8 17.2 16.8 15.8 15.1 30.5 24.1 23.4 22.7 21.7 20.8 20.0 19.3 18.6 17.9 17.4 16.9 15.9 15.2 30.6 24.3 23.6 22.8 21.9 20.9 20.2 19.4 18.7 18.0 17.5 17.0 16.0 15.2 30.7 24.5 23.8 23.0 22.0 21.1 20.3 19.6 18.8 18.1 17.6 17.1 16.1 15.3 30.8 24.6 23.9 23.1 22.1 21.2 20.4 19.7 18.9 18.2 17.7 17.2 16.2 15.430.9 24.8 24.1 23.3 22.3 21.3 20.6 19.8 19.1 18.3 17.8 17.3 16.3 15.531.0 24.9 24.2 23.4 22.4 21.4 20.7 19.9 19.2 18.4 17.9 17.4 16.4 15.5 31.1 25.1 24.3 23.6 22.6 21.6 20.8 20.1 19.3 18.5 18.0 17.5 16.5 15.6 31.2 25.2 24.4 23.7 22.7 21.7 20.9 20.2 19.4 18.6 18.1 17.6 16.6 15.7 31.3 25.4 24.6 23.9 22.9 21.9 21.1 20.4 19.6 18.8 18.3 17.7 16.8 15.8 31.4 25.6 24.8 24.1 23.0 22.0 21.2 20.5 19.7 18.9 18.4 17.8 16.9 15.8 31.5 25.8 25.0 24.2 23.2 22.2 21.4 20.6 19.8 19.1 18.5 17.9 17.0 15.9 31.6 25.9 25.1 24.3 23.3 22.3 21.5 20.7 19.9 19.2 18.6 18.0 17.1 16.0 31.7 26.1 25.3 24.5 23.5 22.4 21.6 20.9 20.1 19.3 18.8 18.1 17.2 16.1 31.8 26.2 25.4 24.6 23.6 22.5 21.7 21.0 20.2 19.4 18.9 18.2 17.3 16.231.9 26.4 25.6 24.8 23.8 22.7 21.9 21.1 20.3 19.5 19.0 18.3 17.4 16.332.0 26.5 25.7 24.9 23.9 22.8 22.0 21.2 20.4 19.6 19.1 18.4 17.5 16.4 32.1 26.7 25.9 25.1 24.1 23.0 22.2 21.4 20.6 19.8 19.3 18.5 17.6 16.5 32.2 26.9 26.1 25.3 24.2 23.1 22.3 21.5 20.7 19.9 19.4 18.6 17.7 16.6 32.3 27.1 26.3 25.5 24.4 23.3 22.5 21.7 20.8 20.0 19.5 18.7 17.8 16.7 32.4 27.2 26.4 25.6 24.5 23.4 22.6 21.8 20.9 20.1 19.6 18.8 17.9 16.8 32.5 27.4 26.6 25.8 24.7 23.6 22.8 22.0 21.1 20.3 19.8 18.9 18.0 16.9 32.6 27.6 26.8 25.9 24.8 23.7 22.9 22.1 21.3 20.4 19.9 19.0 18.1 17.0平均碳化深度值 d m(mm)(新浇筑砼3个月内碳化度视为0）回弹值R m0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 ≥6.0 32.7 27.8 27.0 26.1 25.0 23.9 23.1 22.2 21.4 20.5 20.0 19.1 18.2 17.1 32.8 27.9 27.1 26.2 25.1 24.0 23.2 22.3 21.5 20.6 20.1 19.2 18.3 17.232.9 28.1 27.3 26.4 25.3 24.2 23.3 22.5 21.6 20.8 20.2 19.3 18.4 17.333.0 28.2 27.4 26.5 25.4 24.3 23.4 22.6 21.7 20.9 20.3 19.4 18.5 17.4 33.1 28.4 27.6 26.7 25.6 24.5 23.6 22.8 21.9 21.1 20.4 19.5 18.6 17.5 33.2 28.6 27.7 26.8 25.7 24.6 23.7 22.9 22.0 21.2 20.5 19.6 18.7 17.6 33.3 28.8 27.9 27.0 25.9 24.8 23.9 23.0 22.2 21.3 20.6 19.7 18.8 17.7 33.4 28.9 28.0 27.1 26.0 24.9 24.0 23.1 22.3 21.4 20.7 19.8 18.9 17.8 33.5 29.1 28.2 27.3 26.2 25.1 24.1 23.2 22.5 21.6 20.8 19.9 19.0 17.9 33.6 29.3 28.4 27.4 26.4 25.2 24.2 23.3 22.6 21.7 20.9 20.0 19.1 18.0 33.7 29.5 28.6 27.6 26.5 25.3 24.3 23.4 22.7 21.8 21.0 20.1 19.2 18.1 33.8 29.6 28.7 27.7 26.6 25.4 24.4 23.5 22.8 21.9 21.1 20.2 19.3 18.233.9 29.8 28.9 27.9 26.7 25.5 24.5 23.6 22.9 22.0 21.2 20.3 19.4 18.334.0 30.0 29.1 28.0 26.8 25.6 24.6 23.7 23.0 22.1 21.3 20.4 19.5 18.3 34.1 30.2 29.3 28.2 26.9 25.7 24.7 23.8 23.1 22.2 21.4 20.5 19.6 18.4 34.2 30.3 29.4 28.3 27.0 25.8 24.8 23.9 23.2 22.3 21.5 20.6 19.7 18.4 34.3 30.5 29.6 28.5 27.1 25.9 24.9 24.0 23.3 22.4 21.6 20.7 19.8 18.5 34.4 30.7 29.8 28.6 27.2 26.0 25.0 24.1 23.4 22.5 21.7 20.8 19.8 18.6 34.5 30.9 30.0 28.8 27.3 26.1 25.1 24.2 23.5 22.6 21.8 20.9 19.9 18.7 34.6 31.1 30.2 28.9 27.4 26.2 25.2 24.3 23.6 22.7 21.9 21.0 20.0 18.8 34.7 31.3 30.4 29.1 27.5 26.3 25.3 24.4 23.7 22.8 22.0 21.1 20.1 18.9 34.8 31.4 30.5 29.2 27.6 26.4 25.4 24.5 23.8 22.9 22.1 21.2 20.2 19.034.9 31.6 30.7 29.4 27.8 26.6 25.6 24.7 23.9 23.1 22.2 21.3 20.3 19.135.0 31.8 30.8 29.6 28.0 26.7 25.8 24.8 24.0 23.2 22.3 21.4 20.4 19.2 35.1 32.0 31.0 29.8 28.1 26.9 25.9 24.9 24.1 23.3 22.4 21.5 20.5 19.3 35.2 32.1 31.1 29.9 28.2 27.0 26.0 25.0 24.2 23.4 22.5 21.6 20.6 19.4 35.3 32.3 31.3 30.1 28.4 27.2 26.2 25.2 24.3 23.6 22.7 21.7 20.7 19.5 35.4 32.5 31.5 30.2 28.6 27.3 26.3 25.4 24.4 23.7 22.8 21.8 20.8 19.6 35.5 32.7 31.7 30.4 28.8 27.5 26.5 25.6 24.6 23.9 22.9 21.9 20.9 19.7 35.6 32.9 31.9 30.6 29.0 27.6 26.6 25.7 24.7 24.0 23.0 22.0 21.0 19.8 35.7 33.1 32.1 30.8 29.2 27.8 26.8 25.9 24.9 24.2 23.2 22.1 21.1 19.9 35.8 33.3 32.3 31.0 29.3 28.0 27.0 26.0 25.0 24.3 23.3 22.2 21.2 20.035.9 33.5 32.5 31.1 29.5 28.1 27.1 26.1 25.1 24.4 23.4 22.3 21.3 20.136.0 33.6 32.6 31.2 29.6 28.2 27.2 26.2 25.2 24.5 23.5 22.4 21.4 20.2 36.1 33.8 32.8 31.4 29.8 28.4 27.4 26.4 25.4 24.7 23.7 22.5 21.5 20.3 36.2 34.0 33.0 31.6 29.9 28.6 27.5 26.5 25.5 24.8 23.8 22.6 21.6 20.4 36.3 34.2 33.2 31.8 30.1 28.8 27.7 26.7 25.7 25.0 24.0 22.7 21.7 20.5 36.4 34.4 33.4 32.0 30.3 28.9 27.9 26.8 25.8 25.1 24.1 22.8 21.8 20.6 36.5 34.6 33.6 32.2 30.5 29.1 28.1 27.0 26.0 25.3 24.3 22.9 21.9 20.8 36.6 34.8 33.8 32.4 30.6 29.2 28.2 27.1 26.1 25.4 24.4 23.0 22.0 20.9 36.7 35.0 34.0 32.6 30.8 29.4 28.4 27.3 26.3 25.6 24.5 23.1 22.1 21.0 36.8 35.2 34.1 32.7 31.0 29.6 28.5 27.5 26.4 25.7 24.6 23.2 22.2 21.1 36.9 35.4 34.3 32.9 31.1 29.7 28.7 27.6 26.5 25.8 24.7 23.3 22.3 21.2平均碳化深度值 d m(mm)(新浇筑砼3个月内碳化度视为0）回弹值R m0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 ≥6.0 37.0 35.5 34.4 33.0 31.2 29.8 28.8 27.7 26.6 25.9 24.8 23.4 22.4 21.3 37.1 35.7 34.6 33.2 31.4 30.0 29.0 27.9 26.8 26.1 25.0 23.6 22.5 21.4 37.2 35.9 34.8 33.4 31.6 30.2 29.1 28.0 26.9 26.2 25.1 23.7 22.6 21.5 37.3 36.1 35.0 33.6 31.8 30.4 29.3 28.2 27.1 26.4 25.3 23.9 22.8 21.7 37.4 36.3 35.2 33.8 31.9 30.5 29.4 28.3 27.2 26.5 25.4 24.0 22.9 21.8 37.5 36.5 35.4 34.0 32.1 30.7 29.6 28.5 27.4 26.7 25.6 24.1 23.0 21.9 37.6 36.7 35.6 34.1 32.3 30.8 29.7 28.6 27.5 26.8 25.7 24.2 23.1 22.0 37.7 36.9 35.8 34.3 32.5 31.0 29.9 28.8 27.7 27.0 25.9 24.4 23.3 22.2 37.8 37.1 36.0 34.5 32.6 31.2 30.0 28.9 27.8 27.1 26.0 24.5 23.4 22.337.9 37.3 36.2 34.7 32.8 31.4 30.2 29.1 28.0 27.3 26.1 24.7 23.5 22.438.0 37.5 36.4 34.9 33.0 31.5 30.3 29.2 28.1 27.4 26.2 24.8 23.6 22.5 38.1 37.7 36.6 35.1 33.2 31.7 30.5 29.4 28.3 27.6 26.4 24.9 23.8 22.6 38.2 37.9 36.8 35.2 33.4 31.8 30.6 29.5 28.4 27.7 26.5 25.0 23.9 22.7 38.3 38.1 37.0 35.4 33.6 32.0 30.8 29.7 28.6 27.9 26.7 25.2 24.0 22.9 38.4 38.3 37.2 35.6 33.7 32.1 30.9 29.8 28.7 28.0 26.8 25.3 24.1 23.0 38.5 38.5 37.4 35.8 33.9 32.3 31.1 30.0 28.9 28.2 26.9 25.4 24.3 23.1 38.6 38.7 37.5 36.0 34.1 32.4 31.2 30.1 29.0 28.3 27.0 25.5 24.4 23.2 38.7 38.9 37.7 36.2 34.3 32.6 31.4 30.3 29.2 28.4 27.1 25.7 24.5 23.4 38.8 39.1 37.9 36.4 34.4 32.7 31.5 30.4 29.3 28.5 27.2 25.8 24.6 23.538.9 39.3 38.1 36.6 34.6 32.9 31.7 30.5 29.5 28.7 27.3 25.9 24.7 23.639.0 39.5 38.2 36.7 34.7 33.0 31.8 30.6 29.6 28.8 27.4 26.0 24.8 23.7 39.1 39.7 38.4 36.9 34.9 33.2 32.0 30.7 29.7 28.9 27.5 26.1 24.9 23.9 39.2 39.9 38.5 37.0 35.0 33.3 32.1 30.8 29.8 29.0 27.6 26.2 25.0 24.0 39.3 40.1 38.7 37.2 35.2 33.5 32.3 30.9 29.9 29.1 27.7 26.3 25.1 24.1 39.4 40.3 38.8 37.3 35.3 33.6 32.4 31.0 30.0 29.2 27.8 26.4 25.2 24.2 39.5 40.5 39.0 37.5 35.5 33.8 32.6 31.1 30.1 29.3 27.9 26.5 25.3 24.3 39.6 40.7 39.1 37.6 35.6 33.9 32.7 31.2 30.2 29.4 28.0 26.6 25.4 24.4 39.7 41.0 39.4 37.8 35.8 34.1 32.9 31.3 30.4 29.6 28.1 26.7 25.5 24.6 39.8 41.2 39.6 38.0 35.9 34.2 33.0 31.4 30.5 29.7 28.2 26.8 25.6 24.739.9 41.4 39.8 38.2 36.1 34.4 33.2 31.6 30.7 29.9 28.3 26.9 25.7 24.940.0 41.6 39.9 38.3 36.2 34.5 33.3 31.7 30.8 30.0 28.4 27.0 25.8 25.0 40.1 41.8 40.1 38.5 36.4 34.7 33.5 31.9 31.0 30.1 28.5 27.2 25.9 25.1 40.2 42.0 40.3 38.6 36.5 34.8 33.6 32.0 31.1 30.2 28.6 27.3 26.0 25.2 40.3 42.2 40.5 38.8 36.7 35.0 33.8 32.2 31.3 30.4 28.7 27.5 26.1 25.3 40.4 42.4 40.7 39.0 36.9 35.1 33.9 32.3 31.4 30.5 28.8 27.6 26.2 25.4 40.5 42.6 40.9 39.2 37.1 35.3 34.1 32.5 31.6 30.7 29.0 27.7 26.4 25.6 40.6 42.8 41.1 39.4 37.2 35.4 34.2 32.6 31.7 30.8 29.1 27.8 26.5 25.7 40.7 43.1 41.4 39.6 37.5 35.6 34.4 32.8 31.9 31.0 29.3 28.0 26.7 25.9 40.8 43.3 41.6 39.8 37.7 35.7 34.5 32.9 32.0 31.2 29.4 28.1 26.8 26.040.9 43.5 41.8 40.0 37.9 35.9 34.7 33.1 32.2 31.4 29.6 28.3 27.0 26.141.0 43.7 42.0 40.2 38.0 36.0 34.8 33.2 32.3 31.5 29.7 28.4 27.1 26.2 41.1 43.9 42.2 40.4 38.2 36.2 35.0 33.4 32.5 31.7 29.9 28.6 27.2 26.4 41.2 44.1 42.3 40.6 38.4 36.3 35.1 33.5 32.6 31.8 30.0 28.7 27.3 26.5平均碳化深度值 d m(mm)(新浇筑砼3个月内碳化度视为0）回弹值R m0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 ≥6.0 41.3 44.3 42.5 40.8 38.6 36.5 35.3 33.7 32.8 31.9 30.2 28.8 27.5 26.6 41.4 44.5 42.7 40.9 38.7 36.6 35.4 33.8 32.9 32.0 30.3 28.9 27.6 26.7 41.5 44.8 43.0 41.2 39.0 36.8 35.6 34.0 33.1 32.2 30.5 29.1 27.8 26.9 41.6 45.0 43.2 41.4 39.2 36.9 35.7 34.2 33.3 32.4 30.6 29.2 27.9 27.0 41.7 45.2 43.4 41.6 39.4 37.1 35.9 34.4 33.5 32.6 30.8 29.4 28.0 27.1 41.8 45.4 43.6 41.8 39.5 37.2 36.0 34.5 33.6 32.7 30.9 29.5 28.1 27.241.9 45.7 43.9 42.0 39.7 37.4 36.2 34.7 33.8 32.9 31.1 29.7 28.3 27.442.0 45.9 44.1 42.2 39.9 37.6 36.3 34.9 34.0 33.0 31.2 29.8 28.5 27.5 42.1 46.1 44.3 42.4 40.1 37.8 36.5 35.1 34.2 33.2 31.4 30.0 28.6 27.7 42.2 46.3 44.4 42.6 40.3 38.0 36.6 35.2 34.3 33.3 31.5 30.1 28.7 27.8 42.3 46.5 44.6 42.8 40.5 38.2 36.8 35.4 34.5 33.5 31.7 30.3 28.9 27.9 42.4 46.7 44.8 43.0 40.6 38.3 36.9 35.5 34.6 33.6 31.8 30.4 29.0 28.0 42.5 47.0 45.1 43.2 40.9 38.5 37.1 35.7 34.8 33.8 32.0 30.6 29.2 28.2 42.6 47.2 45.3 43.4 41.1 38.7 37.3 35.9 34.9 34.0 32.1 30.7 29.3 28.3 42.7 47.4 45.5 43.6 41.3 38.9 37.5 36.1 35.1 34.2 32.3 30.8 29.4 28.5 42.8 47.6 45.7 43.8 41.4 39.0 37.6 36.2 35.2 34.3 32.4 30.9 29.5 28.642.9 47.9 46.0 44.0 41.6 39.2 37.8 36.4 35.4 34.5 32.6 31.1 29.7 28.843.0 48.1 46.2 44.2 41.8 39.4 38.0 36.6 35.6 34.6 32.7 31.3 29.8 28.9 43.1 48.3 46.4 44.4 42.0 39.6 38.2 36.8 35.8 34.8 32.9 31.4 30.0 29.0 43.2 48.5 46.6 44.6 42.2 39.8 38.3 36.9 35.9 34.9 33.0 31.5 30.1 29.1 43.3 48.8 46.8 44.9 42.4 40.0 38.5 37.1 36.1 35.1 33.2 31.7 30.3 29.3 43.4 49.0 47.0 45.1 42.6 40.2 38.7 37.2 36.3 35.3 33.3 31.8 30.4 29.4 43.5 49.2 47.2 45.3 42.8 40.4 38.9 37.4 36.5 35.5 33.5 32.0 30.5 29.5 43.6 49.4 47.4 45.4 43.0 40.5 39.0 37.5 36.6 35.6 33.6 32.1 30.6 29.6 43.7 49.7 47.7 45.7 43.2 40.7 39.2 37.7 36.8 35.8 33.8 32.3 30.8 29.8 43.8 49.9 47.9 45.9 43.4 40.9 39.4 37.9 36.9 35.9 33.9 32.4 30.9 29.943.9 50.2 48.2 46.2 43.6 41.1 39.6 38.1 37.1 36.1 34.1 32.6 31.1 30.144.0 50.4 48.4 46.4 43.8 41.3 39.8 38.3 37.3 36.3 34.3 32.8 31.2 30.2 44.1 50.6 48.6 46.6 44.0 41.5 40.0 38.5 37.5 36.5 34.4 32.9 31.4 30.4 44.2 50.8 48.8 46.7 44.2 41.7 40.1 38.6 37.6 36.6 34.5 33.0 31.5 30.5 44.3 51.1 49.0 47.0 44.4 41.9 40.3 38.8 37.8 36.8 34.7 33.2 31.7 30.7 44.4 51.3 49.2 47.2 44.6 42.1 40.5 39.0 38.0 36.9 34.9 33.3 31.8 30.8 44.5 51.5 49.4 47.4 44.8 42.3 40.7 39.2 38.2 37.1 35.1 33.5 32.0 30.9 44.6 51.7 49.6 47.6 45.0 42.4 40.8 39.3 38.3 37.2 35.2 33.6 32.1 31.0 44.7 52.0 49.9 47.8 45.2 42.6 41.0 39.5 38.5 37.4 35.4 33.8 32.3 31.2 44.8 52.2 50.1 48.0 45.4 42.8 41.2 39.7 38.6 37.6 35.5 33.9 32.4 31.344.9 52.5 50.4 48.3 45.6 43.0 41.4 39.9 38.8 37.8 35.7 34.1 32.6 31.545.0 52.7 50.6 48.5 45.8 43.2 41.6 40.1 39.0 37.9 35.8 34.3 32.7 31.6 45.1 53.0 50.9 48.7 46.1 43.4 41.8 40.3 39.2 38.1 36.0 34.5 32.9 31.8 45.2 53.2 51.1 48.9 46.3 43.6 42.0 40.4 39.4 38.3 36.2 34.6 33.0 31.9 45.3 53.4 51.3 49.2 46.5 43.8 42.2 40.6 39.6 38.5 36.3 34.7 33.1 32.1 45.4 53.6 51.5 49.4 46.6 44.0 42.3 40.7 39.7 38.6 36.4 34.8 33.2 32.2 45.5 53.9 51.7 49.6 46.9 44.2 42.5 40.9 39.9 38.8 36.6 35.0 33.4 32.4平均碳化深度值 d m(mm)(新浇筑砼3个月内碳化度视为0）回弹值R m0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 ≥6.0 45.6 54.1 51.9 49.8 47.1 44.4 42.7 41.1 40.0 39.0 36.8 35.2 33.5 32.5 45.7 54.4 52.2 50.0 47.3 44.6 42.9 41.3 40.2 39.2 37.0 35.4 33.7 32.7 45.8 54.6 52.4 50.2 47.5 44.8 43.1 41.5 40.4 39.3 37.1 35.5 33.9 32.845.9 54.8 52.6 50.4 47.7 45.0 43.3 41.7 40.6 39.5 37.3 35.7 34.1 33.046.0 55.0 52.8 50.6 47.9 45.2 43.5 41.9 40.8 39.7 37.5 35.8 34.2 33.1 46.1 55.3 53.1 50.9 48.1 45.4 43.7 42.1 41.0 39.9 37.6 36.0 34.3 33.2 46.2 55.5 53.3 51.1 48.3 45.5 43.8 42.2 41.1 40.0 37.7 36.1 34.4 33.3 46.3 55.8 53.6 51.3 48.5 45.7 44.0 42.4 41.3 40.2 37.9 36.3 34.6 33.5 46.4 56.0 53.8 51.5 48.7 45.9 44.2 42.6 41.4 40.3 38.1 36.4 34.7 33.6 46.5 56.3 54.0 51.8 49.0 46.1 44.4 42.8 41.6 40.5 38.3 36.6 34.9 33.8 46.6 56.5 54.2 52.0 49.2 46.3 44.6 42.9 41.8 40.7 38.4 36.7 35.0 33.9 46.7 56.8 54.5 52.2 49.4 46.5 44.8 43.1 42.0 40.9 38.6 36.9 35.2 34.1 46.8 57.0 54.7 52.4 49.6 46.7 45.0 43.3 42.2 41.0 38.8 37.0 35.3 34.246.9 57.3 55.0 52.7 49.8 47.0 45.1 43.5 42.4 41.2 39.0 37.2 35.5 34.447.0 57.5 55.2 52.9 50.0 47.2 45.2 43.7 42.6 41.4 39.1 37.4 35.6 34.5 47.1 57.8 55.5 53.2 50.3 47.4 45.5 43.9 42.8 41.6 39.3 37.6 35.8 34.7 47.2 58.0 55.7 53.4 50.5 47.6 45.8 44.1 42.9 41.8 39.4 37.7 36.0 34.8 47.3 58.3 56.0 53.6 50.7 47.8 46.0 44.3 43.1 42.0 39.6 37.9 36.2 35.0 47.4 58.5 56.2 53.8 50.9 48.0 46.2 44.5 43.3 42.1 39.8 38.0 36.3 35.1 47.5 58.8 56.4 54.1 51.1 48.2 46.4 44.7 43.5 42.3 40.0 38.2 36.5 35.3 47.6 59.0 56.6 54.3 51.3 48.4 46.6 44.8 43.7 42.5 40.1 38.4 36.6 35.4 47.7 59.3 46.9 54.5 51.6 48.6 46.8 45.0 43.9 42.7 40.3 38.6 36.8 35.6 47.8 59.5 37.1 54.7 51.8 48.8 47.0 45.2 44.0 42.8 40.5 38.7 36.9 35.747.9 59.8 47.4 55.0 52.0 49.0 47.2 45.4 44.2 43.0 40.7 38.9 37.1 35.948.0 60.0 57.6 55.2 52.2 49.2 47.4 45.6 44.4 43.2 40.8 39.0 37.2 36.0 48.1 57.8 55.5 52.4 49.4 47.6 45.8 44.6 43.4 41.0 39.2 37.4 36.2 48.2 58.0 55.7 52.6 49.6 47.8 46.0 44.8 43.6 41.1 39.3 37.5 36.3 48.3 58.3 55.9 52.9 49.8 48.0 46.2 45.0 43.8 41.3 39.5 37.7 36.5 48.4 58.6 56.1 53.1 50.0 48.2 46.4 45.1 43.9 41.5 39.6 37.8 36.6 48.5 58.8 56.4 53.3 50.2 48.4 46.6 45.3 44.1 41.7 39.8 38.0 36.8 48.6 59.0 56.6 53.5 50.4 48.6 46.7 45.5 44.3 41.8 40.0 38.1 36.9 48.7 59.3 56.9 53.8 50.7 48.8 46.9 45.7 44.5 42.0 40.2 38.3 37.1 48.8 59.5 57.1 54.0 50.9 49.0 47.1 45.9 44.6 42.2 40.3 38.4 37.248.9 59.8 57.3 54.2 51.1 49.2 47.3 46.1 44.8 42.4 40.5 38.6 37.449.0 60.0 57.5 54.4 51.3 49.4 47.5 46.2 45.0 42.5 40.6 38.8 37.5 49.1 57.8 54.6 51.5 49.6 47.7 46.4 45.2 42.7 40.8 39.0 37.7 49.2 58.0 54.8 51.7 49.8 47.9 46.6 45.4 42.8 41.0 39.1 37.8 49.3 58.3 55.1 51.9 50.0 48.1 46.9 45.6 43.0 41.2 39.3 38.0 49.4 58.5 55.3 52.1 50.2 48.3 47.1 45.8 43.2 41.3 39.4 38.2 49.5 58.7 55.5 52.3 50.4 48.5 47.3 46.0 43.4 41.5 39.6 38.4 49.6 58.9 55.7 52.5 50.6 48.7 47.4 46.2 43.6 41.7 39.7 38.5 49.7 59.2 56.0 52.8 50.8 48.9 47.6 46.4 43.8 41.9 39.9 38.7 49.8 59.4 56.2 53.0 51.0 49.1 47.8 46.5 43.9 42.0 40.1 38.8平均碳化深度值 d m(mm)(新浇筑砼3个月内碳化度视为0）回弹值R m0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 ≥6.049.9 59.7 56.5 53.2 51.2 49.3 48.0 46.7 44.1 42.2 40.3 39.050.0 59.9 56.7 53.4 51.4 49.5 48.2 46.9 44.3 42.3 40.4 39.1 50.1 56.9 53.6 51.7 49.7 48.4 47.1 44.5 42.5 40.6 39.3 50.2 57.1 53.8 51.9 49.9 48.5 47.2 44.6 42.6 40.7 39.4 50.3 57.4 54.1 52.1 50.1 48.8 47.5 44.8 42.8 40.9 39.6 50.4 57.6 54.3 52.3 50.3 49.0 47.7 45.0 43.0 41.0 39.7 50.5 57.8 54.5 52.5 50.5 49.2 47.9 45.2 43.2 41.2 39.9 50.6 58.0 54.7 52.7 50.7 49.4 48.0 45.4 43.4 41.4 40.0 50.7 58.3 54.9 52.9 50.9 49.6 48.2 45.6 43.6 41.6 40.2 50.8 58.5 55.1 53.1 51.1 49.8 48.4 45.7 43.7 41.7 40.350.9 58.8 55.4 53.3 51.3 50.0 48.6 45.9 43.9 41.9 40.551.0 59.0 55.6 53.5 51.5 50.1 48.8 46.1 44.1 42.0 40.7 51.1 59.2 55.8 53.8 51.7 50.3 49.0 46.3 44.3 42.2 40.9 51.2 59.4 56.0 54.0 51.9 50.5 49.2 46.4 44.4 42.3 41.0 51.3 59.7 56.2 54.2 52.1 50.7 49.4 46.6 44.6 42.5 41.2 51.4 59.9 56.4 54.4 52.3 50.9 49.6 46.8 44.7 42.7 41.3 51.5 56.7 54.6 52.5 51.1 49.8 47.0 44.9 42.9 41.5 51.6 56.9 54.8 52.7 51.3 50.0 47.2 45.1 43.0 41.6 51.7 57.1 55.0 52.9 51.5 50.2 47.4 45.3 43.2 41.7 51.8 57.3 55.2 53.1 51.7 50.3 47.5 45.4 43.3 41.851.9 57.6 55.5 53.4 51.9 50.5 47.7 45.6 43.5 42.152.0 57.8 55.7 53.6 52.1 50.7 47.9 45.8 43.7 42.3 52.1 58.0 55.9 53.8 52.3 50.9 48.1 46.0 43.9 42.5 52.2 58.2 56.1 54.0 52.5 51.1 48.3 46.2 44.0 42.6 52.3 58.5 56.3 54.2 52.8 51.3 48.5 46.4 44.2 42.8 52.4 58.7 56.5 54.4 53.0 51.5 48.7 46.5 44.4 43.0 52.5 58.9 56.8 54.6 53.2 51.7 48.9 46.7 44.6 43.2 52.6 59.1 57.0 54.8 53.4 51.9 49.0 46.9 44.7 43.3 52.7 59.4 57.2 55.0 53.6 52.1 49.2 47.1 44.9 43.5 52.8 59.6 57.4 55.2 53.8 52.3 49.4 47.3 45.1 43.652.9 59.8 57.6 55.4 54.0 52.5 49.6 47.5 45.3 43.853.0 60.0 57.8 55.6 54.2 52.7 49.8 47.6 45.4 43.9 53.1 58.1 55.9 54.4 52.9 50.0 47.8 45.6 44.1 53.2 58.3 56.1 54.6 53.1 50.2 48.0 45.8 44.3 53.3 58.5 56.3 54.8 53.3 50.4 48.2 46.0 44.5 53.4 58.7 56.5 55.0 53.5 50.5 48.3 46.1 44.6 53.5 59.0 56.7 55.2 53.7 50.7 48.5 46.3 44.8 53.6 59.2 56.9 55.4 53.9 50.9 48.7 46.4 44.9 53.7 59.4 57.1 55.6 54.1 51.1 48.9 46.6 45.1 53.8 59.6 57.3 55.8 54.3 51.3 49.0 46.8 45.353.9 57.6 56.1 54.5 51.5 49.2 47.0 45.554.0 57.8 56.3 54.7 51.7 49.4 47.1 45.6 54.1 58.0 56.5 54.9 51.9 49.6 47.3 45.8平均碳化深度值 d m(mm)(新浇筑砼3个月内碳化度视为0）回弹值R m0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 ≥6.0 54.2 58.2 56.7 55.1 52.1 49.8 47.5 46.0 54.3 58.4 56.9 55.4 52.3 50.0 47.7 46.2 54.4 58.6 57.1 55.6 52.5 50.2 47.9 46.3 54.5 58.9 57.3 55.8 52.7 50.4 48.1 46.5 54.6 59.1 57.5 56.0 52.9 50.5 48.2 46.6 54.7 59.3 57.7 56.2 53.1 50.7 48.4 46.8 54.8 59.5 57.9 56.4 53.2 50.9 48.5 47.054.9 59.7 58.2 56.6 53.4 51.1 48.7 47.255.0 59.9 58.4 56.8 53.6 51.3 48.9 47.3 55.1 58.6 57.0 53.8 51.5 49.1 47.5 55.2 58.8 57.2 54.0 51.6 49.3 47.7 55.3 59.0 57.4 54.2 51.8 49.5 47.9 55.4 59.2 57.6 54.4 52.0 49.6 48.0 55.5 59.5 57.8 54.6 52.2 49.8 48.2 55.6 59.7 58.0 54.8 52.4 50.0 48.4 55.7 58.3 55.0 52.6 50.2 48.6 55.8 58.5 55.2 52.8 50.3 48.755.9 58.7 55.4 53.0 50.5 48.956.0 58.9 55.6 53.2 50.7 49.1 56.1 59.1 55.8 53.4 50.9 49.3 56.2 59.3 56.0 53.5 51.1 49.4 56.3 59.5 56.2 53.7 51.3 49.6 56.4 59.7 56.4 53.9 51.4 49.8 56.5 56.6 54.1 51.6 50.0 56.6 56.8 54.3 51.8 50.1 56.7 57.0 54.5 52.0 50.3 56.8 57.2 54.7 52.2 50.556.9 57.4 54.9 52.4 50.757.0 57.6 55.1 52.5 50.8 57.1 57.8 55.3 52.7 51.0 57.2 58.0 55.5 52.9 51.2 57.3 58.2 55.7 53.1 51.4 57.4 58.4 55.9 53.3 51.6 57.5 58.7 56.1 53.5 51.8 57.6 58.9 56.3 53.7 51.9 57.7 59.1 56.5 53.9 52.1 57.8 59.3 56.7 54.0 52.357.9 59.5 56.9 54.2 52.558.0 59.7 57.0 54.4 52.7 58.1 57.2 54.6 52.9 58.2 57.4 54.8 53.0 58.3 57.6 55.0 53.2 58.4 57.8 55.2 53.4平均碳化深度值 d m(mm)(新浇筑砼3个月内碳化度视为0）回弹值R m0 0.51.01.52.02.53.03.54.04.55.0 5.5 ≥6.0 58.5 58.0 55.4 53.6 58.6 58.2 55.6 53.8 58.7 58.4 55.8 54.0 58.8 58.6 55.9 54.158.9 58.8 56.1 54.359.0 59.0 56.3 54.5 59.1 59.2 56.5 54.7 59.2 59.4 56.7 54.9 59.3 59.6 56.9 55.1 59.4 59.8 57.1 55.2 59.5 57.3 55.4 59.6 57.5 55.6 59.7 57.7 55.8 59.8 57.9 56.059.9 58.1 56.260.0 58.3 56.4。

混凝土：
混凝土：是指由胶凝材料将集料胶结成整体的工程复合材料的统称。

通常讲的混凝土一词是指用水泥作胶凝材料，砂、石作集料；与水按一定比例配合，经搅拌而得的水泥混凝土，也称普通混凝土，它广泛应用于土木工程。

回弹法：
回弹法是用一弹簧驱动的重锤，通过弹击杆，弹击混凝土表面，并测出重锤被反弹回来的距离，以回弹值作为与强度相关的指标，来推定混凝土强度的一种方法。

回弹法检测混凝土抗压强度技术规程：
《回弹法检测混凝土抗压强度技术规程》是2011年7月1日中国建筑工业出版社出版的图书，作者是陕西省建筑科学研究院。

内容简介：
本规程的主要技术内容是：1.总则；2.术语和符号；3.回弹仪；
4.检测技术；
5.回弹值计算；
6.测强曲线；
7.混凝土强度的计算。

本规程经住房和城乡建设部以公告第1000号批准、发布，自2011年12月1日起实施。

原《回弹法检测混凝土抗压强度技术规程》JGJ/T23-2001同时废止
目录：
1 总则；
2 术语和符号；
3 回弹仪；
4 检测技术；
5 回弹值计算；
6 测强曲线；
7 混凝土强度的计算。

附录A 测区混凝土强度换算表；
附录B 泵送混凝土测区强度换算表；
附录C 非水平方向检测时的回弹值修正值；附录D 不同浇筑面的回弹值修正值；
附录E 地区和专用测强曲线的制定方法；附录F 回弹法检测混凝土抗压强度报告。

本规程用词说明。

引用标准名录。

附：条文说明。

测区泵送混凝土强度换算表表B测区泵送混凝土强度换算表
注：表中未注明的测区混凝土强度换算值为小于10 MPa或大于60MPa 表中数值是根据曲线方程f O.O34488R1.9400 1 O(0.0173咖计算
附录C非水平方向检测时的回弹值修正值表C非水平方向检测时的回弹值修
正值
注：1 R m小于20或大于50时，分别按20或50查表；
2表中未列入的相应于R m的修正值R m，可用内插法求得，精确至
附录D不同浇筑面的回弹值修正值
表D不同浇筑面的回弹值修正值
注：1瓜或R m小于20或大于50时，分别按20或50查表；
2表中有关混凝土浇筑表面的修正系数，是指一般原浆抹面的修正值;
3表中有关混凝土浇筑底面的修正系数，是指构件底面与侧面采用同一类模板在正常浇筑情况下的修正值；
4表中未列入相应于R m或R的R和R b，可用内插法求得，精确至。

混凝土强度等级检测 ( 回弹试验 )回弹法检测砼强度试用于工程构造一般砼抗压强度的检测。

砼强度值确实定分为以下几个步骤：1、回弹值丈量2、2、碳化深度值丈量3、3、回弹值计算4、4、砼强度的计算一、回弹值丈量1、一般规定：构造或物品砼强度检测可采纳以下两种方式，其适用范围及构造或构件数目应切合以下规定：（1）、单个检测：合用于单个构造或构件的检测。

（2）、批量检测：合用于同样的生产工艺条件下，砼强度等级同样，原资料、配合比、成型工艺、保养条件基本一致且龄期邻近的同类构造或构件，按批进行检测的构造构件。

抽检数目不得少于同批构件总数的 30%且不得少于 10 件。

2、每一构造或构件的测区应切合以下规定：（1）、每一构造或构件测区数目应许多于10 个。

对某一方向尺寸小于 4.5 米，且另一方向尺寸小于 0.3 米的构件其测区数目可适合减少，但不该少于 5 个。

（2）、相邻两测区的间距应控制在 2 米之内。

测区离构件端部或施工缝边沿的距离不宜大于0.5 米，且不宜小于0.2 米。

（3）、测区应选在使回弹仪处于水平方向检测砼浇筑侧面，当不可以知足这一要求时，可使回弹仪处于非水平方向检测砼强度浇筑侧面、表面或底面。

但回弹值需修正。

（4）、测区宜选在构件的两个对称可测面上，也可选在一个可测面上，且应均匀散布。

在构件的重要部位及单薄部位一定部署测区，并应避开预埋件。

（5）、测区的面积不宜大于 0.04 ㎡。

（6）、检测面应为砼表面，并应洁净平坦，不该有松散层、浮浆、油垢、涂层以及蜂窝、麻面。

必需时可用砂轮消除松散层和杂物，且不该有残留的粉末或碎屑。

3、回弹值测定（1）、检测时，回弹仪的轴线应一直垂直于构造或构件的检测面。

迟缓施压，正确读数，迅速复位。

（2）、测点宜在测区范围内均匀散布。

相邻两测点的净距不宜小于20mm。

测点距外露钢筋、预埋件的距离不宜小于30mm。

测点不该在气孔或外露石子上，同一测点只应弹一次，每一测区应取16 个回弹值。

混凝土强度等级检测(回弹试验) 回弹法检测砼强度试用于工程结构普通砼抗压强度的检测。

砼强度值的确定分为如下几个步骤：1、回弹值测量2、2、碳化深度值测量3、3、回弹值计算4、4、砼强度的计算一、回弹值测量1、一般规定：结构或物件砼强度检测可采用下列两种方式，其适用范围及结构或构件数量应符合下列规定：（1）、单个检测：适用于单个结构或构件的检测。

（2）、批量检测：适用于相同的生产工艺条件下，砼强度等级相同，原材料、配合比、成型工艺、养护条件基本一致且龄期相近的同类结构或构件，按批进行检测的结构构件。

抽检数量不得少于同批构件总数的30%且不得少于10件。

2、每一结构或构件的测区应符合下列规定：（1）、每一结构或构件测区数量应不少于10个。

对某一方向尺寸小于4.5米，且另一方向尺寸小于0.3米的构件其测区数量可适当减少，但不应少于5个。

（2）、相邻两测区的间距应控制在2米以内。

测区离构件端部或施工缝边缘的距离不宜大于0.5米，且不宜小于0.2米。

（3）、测区应选在使回弹仪处于水平方向检测砼浇筑侧面，当不能满足这一要求时，可使回弹仪处于非水平方向检测砼强度浇筑侧面、表面或底面。

但回弹值需修正。

（4）、测区宜选在构件的两个对称可测面上，也可选在一个可测面上，且应均匀分布。

在构件的重要部位及薄弱部位必须布置测区，并应避开预埋件。

（5）、测区的面积不宜大于0.04㎡。

（6）、检测面应为砼表面，并应清洁平整，不应有疏松层、浮浆、油垢、涂层以及蜂窝、麻面。

必要时可用砂轮清除疏松层和杂物，且不应有残留的粉末或碎屑。

3、回弹值测定（1）、检测时，回弹仪的轴线应始终垂直于结构或构件的检测面。

缓慢施压，准确读数，快速复位。

（2）、测点宜在测区范围内均匀分布。

相邻两测点的净距不宜小于20mm。

测点距外露钢筋、预埋件的距离不宜小于30mm。

测点不应在气孔或外露石子上，同一测点只应弹一次，每一测区应取16个回弹值。

二、碳化深度测量值1、回弹值测量完毕后，应在有代表性的位置上测量碳化深度值。