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1、回弹计算方法回弹强度计算方法1.回弹法测构件强度，一个测区16个点，舍去三个最高点，三个最低点，算出10个点的平均值，然后根据碳化深度查表得出混凝土强度换算值。假如是全面回弹，每个构件布10个或10个以上测区，采用方差法计算评定；否则按最小值法评定。34，38，40的数据，碳化假如在1.5左右，勉强到达C30。3+补充问题：这个透明液体是按1%配比自配的酚酞酒精溶液。酚酞溶液测碳化深度利用的原理就是酸碱反响，酚酞作指示剂遇碱变红，遇酸无色，二氧化碳扩散到的地方，酚酞溶液滴上去呈无色，未扩散到的地方呈红色有碱存在。修改五回弹仪测定混凝土强度计算（规程JGJ/T23-2001）根据2001年公布的
2、（回弹法检测混凝土抗压强度技术规程）JGJ/T23-2001J115-2001代替1992年公布的（回弹法检测混凝土抗压强度技术规程）JGJ/T23-92，有如下主要修改。P119页“统一换算表内容有部分改动下表中的灰色部分回弹均测区混凝土平均抗压强度换算值fMpa平均碳化深度值d平均mm值00.51.01.52.02.53.03.54.04.55.05.562010.310.12111.411.210.810.510.02212.512.211.911.511.010.610.22313.713.413.012.612.111.611.210.810.510.12414.914.614.21
3、3.713.112.712.211.811.511.010.710.410.12516.215.915.414.914.313.813.312.812.512.011.711.310.92617.517.216.616.115.414.914.413.813.513.012.612.211.62718.918.518.017.416.616.115.514.814.614.013.613.112.42820.319.719.218.417.617.016.515.815.414.814.413.913.22921.821.120.519.618.718.117.516.816.415.815.
4、414.613.93023.322.621.921.020.019.318.617.917.416.816.415.414.73124.924.223.422.421.420.719.919.218.417.917.416.415.53226.525.724.923.922.822.021.220.419.619.118.417.516.43328.227.426.525.424.323.422.621.720.93430.029.128.026.825.624.623.723.022.121.320.419.518.33531.830.829.628.026.725.824.824.023.
5、222.321.420.419.23633.632.631.229.628.227.226.225.224.523.522.421.420.23735.534.433.031.229.828.827.726.625.924.823.422.421.33837.536.434.933.031.530.329.228.127.426.224.823.622.53939.538.236.734.733.031.830.629.628.827.426.024.823.74041.639.938.336.234.533.331.730.830.028.427.025.825.04143.742.040.
6、238.036.034.833.232.331.529.728.427.126.24245.944.142.239.937.636.334.934.033.031.229.828.527.54348.146.244.241.839.438.036.635.634.632.731.329.828.94450448.446.443.841.339.838.337.336.34552750648.545.843.241.640.139.037.935.834.332.731.64655052850647.945.243.541.940.839.737.535.834.233.147575552529
7、50047.245.243.742.641.439.137.435.634.54860057655252249247.445.644.443.240.839.037.236.04960057554451349447.546.245.042.540.638.837.55059956753451449548.246.944.342.340.439.1P120页9-16行“构件混凝土强度推定值f推定中的推定值计算方法有所改动：4构件混凝土强度推定值f推定构件混凝土强度推定值是指相应于强度换算值总体分布中保证率不低于95的强度值。l当测区少于10个时，以测区混凝土强度的最小值作为该构件的混凝土强度推定值，即：f推定=fi-min2当测区强度值出现小于少于10.0MPa时：f推定=10.0MPa3当测区不少于10个或按批量检测时，该构件的混凝土强度推定值为：f推定-1=f平均1.645S标准差以上各式中：f推定混凝土强度推定值，MPa；fi-min该批构件中测区混凝土强度换算值的最小者，准确至0.1，MPa；f平均构件混凝土强度平均值，准确至0.1，MPa；S标准差构件混凝土强度标准差，准确至0.0l，MPa。