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1、成都市建设管理委员会文件成建委发1998237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
2、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14.0%； 相对标准差er17.0%（2） 专用测强曲线：平均相对误差12.0%； 相对标准差er14.0%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 = 0.00115Rm2.8920.95二、 回弹测强曲线的应用:大流动性泵送砼回弹法测
3、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
4、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3090d的砼；（6）抗压强度为3271MPa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
5、.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
6、.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
7、.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
8、.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
9、.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
10、.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 （注：可编辑下载，若有不当之处，请指正，谢谢!）
