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成都市建设管理委员会文件成建委发〔1998〕237号关于批准试用“成都地区大流动性泵送砼回弹法测定抗压强度曲线”的通知各区（市）、县建委，各有关单位：由成都市混凝土协会等单位承担的《成都地区大流动性泵送砼回弹测定抗压强度曲线的建立》课题，于一九九八年一月十九日通过鉴定。该曲线的建立满足中华人民共和国行业标准JGJ/T23-92《回弹法检测砼抗压强度技术规程》的要求，为成都地区的大流动性泵送砼的抗压强度的检测提供了一种简单、快速、经济、可靠的非破损检测方法，有利于砼强度的质量控制。现批准自一九九八年七月一日起在成都地区试用，各部门在试行中有什么问题或意见，请及时反馈我委。一、成都地区大流动性泵送砼回弹测强曲线：成都地区大流动性泵送砼顺弹测强曲线函数为fccu=0.00115Rm2.892。曲线平均相对误差σ为±9.8%，相对标准差er为±12.3%。达到“规程规定误差要求。“规程”规定的“地区和专用测强曲线”的允许误差为；（1）地区测强曲线：平均相对误差σ≤±14.0%；相对标准差er≤17.0%（2）专用测强曲线：平均相对误差σ≤±12.0%；相对标准差er≤14.0%成都地区大流动性泵送砼回弹测强曲线的建立，已于一九九八年一月通过市级技术鉴定。为了对结构安全更为可靠，在应用中进行减少5%的修正，即fccu=0.00115Rm2.892×0.95二、回弹测强曲线的应用:大流动性泵送砼回弹法测砼抗压强度的方法，回弹仪技术要求，碳化深度测试，仪器测试角度及测试构件表面性质（即砼浇筑表面或浇筑底面），构件砼强度推定值评定（单个构件或批量检测），均按中华人民共和国行业标准《回弹法检测砼抗压强度技术规程》（JGJ/T23-92）办理。只是砼强度换算值，试用大流动性泵送砼回弹测强曲线计算。为了方便应用，我们对大流动性泵送砼回弹测强曲线进行了制表，以便查用。三、大流动性泵送砼回弹测强曲线的应用范围：大流动性泵送砼的回弹测区强度换算表，可用于符合下列条件的砼：（1）砼拌合物坍落度≥180mm，并采用泵送工艺浇筑的普通砼及高强砼；（2）采用425#或425#R或525#或525#R的硅酸盐或普通硅酸盐水泥配置的砼；（3）粗骨最大粒径≤40mm的卵石及最大粒径≤31.5mm的碎石和中砂配制的砼；（4）采用高效减水剂或高效泵送剂或缓凝减水剂配置的砼；（5）龄期为30～90d的砼；（6）抗压强度为32～71MPa的砼；（7）成都地区生产使用的大流动性泵送砼。四、回弹测区砼强度换算表平均回弹值Rm测区混凝土强度换算值（MPa）平均碳化深度值dm(mm)00.51.01.52.02.53.035.031.930.629.428.227.126.024.935.232.431.129.828.627.526.425.335.433.031.730.429.228.026.925.835.633.532.230.929.628.427.326.235.834.132.731.430.128.927.826.636.034.633.231.930.629.328.227.036.235.133.732.331.029.828.627.436.435.734.332.931.630.329.127.936.636.334.833.432.130.829.528.436.836.935.434.032.631.330.028.837.037.435.934.433.131.730.429.237.238.136.635.133.732.331.029.837.438.737.235.634.232.831.530.237.639.237.636.134.733.231.930.637.839.938.336.735.333.832.531.238.040.538.937.335.834.333.031.638.241.139.537.936.334.933.532.138.441.740.038.436.935.433.932.638.642.440.739.137.536.034.533.1续表平均回弹值Rm测区混凝土强度换算值（MPa）平均碳化深度值dm(mm)00.51.01.52.02.53.038.842.941.239.537.936.434.933.539.043.641.940.238.537.035.534.139.244.342.540.839.237.636.134.639.444.943.141.439.738.136.535.139.645.643.842.040.338.737.135.639.846.344.442.640.939.337.736.240.046.945.043.241.539.838.236.640.247.645.743.842.140.438.737.240.448.446.544.642.841.039.437.840.649.047.045.143.341.639.938.340.849.747.745.843.942.140.538.841.050.448.446.444.642.741.039.441.251.149.147.145.243.341.639.941.451.949.847.845.944.042.240.541.652.550.448.446.444.542.741.041.853.351.249.147.145.243.441.642.054.151.949.847.845.944.042.342.254.852.650.548.446.544.642.8续表平均回弹值Rm测区混凝土强度换算值（MPa）平均碳化深度值dm(mm)00.51.01.52.02.53.042.455.653.451.249.247.145.343.442.656.354.051.949.847.745.844.042.857.154.852.650.548.446.544.643.057.955.653.351.249.147.145.243.258.656.354.051.849.747.745.843.459.557.154.852.650.548.446.543.660.257.855.453.251.049.747.043.861.058.656.253.951.749.747.644.061.859.356.954.652.450.348.344.262.760.257.755.453.251.049.044.463.561.058.556.153.851.749.644.664.361.759.256.854.552.350.244.865.262.660.057.655.353.150.945.066.063.460.858.356.053.751.545.266.964.261.659.156.754.552.245.467.765.062.459.857.455.152.945.668.665.963.260.658.255.853.645.869.466.663.961.358.956.554.246.070.367.564.762.159.657.254.946.271.368.465.763.060.558.055.7本曲线由成都市混凝土协会管理，其具体解释工作由混凝土协会负责。一九九八年七月八日抄送：省建委科技处