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选取C20,C30,C40,C50共4种强度等级、尺寸均为100mm×100mm×300mm的混凝土试件,在5,10,15,20,25,30,40kN共7个压力等级下测量其回弹值,并通过比较回弹值与压力之间的关系,得出混凝土试件回弹值趋于稳定时的压强临界值约为0.25kN/cm2.将试验结果与原混凝土无损检测规程比对后发现,原无损检测规程在制定测强公式时规定的试件承受压力并不能确保回弹值的正确读取.所得结果可为混凝土无损检测规程的再版修订提供新的依据.
Four kinds of concrete specimens of 100mm × 100mm × 300mm with four kinds of strength grades C20, C30, C40 and C50 were selected and measured under a total pressure of 5, 10, 15, 20, 25, 30 and 40kN And by comparing the relationship between the rebound value and the pressure, the critical value of the pressure at which the rebound value of the concrete specimen tends to be stable is about 0.25 kN / cm 2. The comparison between the test results and the original concrete non-destructive testing protocol It was found that the pressure on the specimen specified in the original non-destructive test procedure when formulating the test formula does not ensure the correct reading of the rebound value. The obtained results can provide a new basis for the revision of the non-destructive test procedure of concrete.