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混凝土凝结时间差即受检混凝土的初凝时间或终凝时间与基准混凝土的初凝或终凝时间的差值,是衡量混凝土外加剂质量的一个重要指标。目前,国家标准中有GB8076-2008《混凝土外加剂》和GB/T50080-2002《普通混凝土拌合物性能试验方法标准》,两者均有“凝结时间试验”方法,对凝结时间的确定,GB8076-2008中只采用绘图拟合方法,GB/T50080-2002中提供了线性回归和绘图拟合两种方
The difference of the concrete setting time is the difference between the initial setting time or the final setting time of the tested concrete and the initial setting or final setting time of the reference concrete. It is an important index to measure the quality of concrete admixture. At present, there are GB8076-2008 “concrete admixture” and GB / T50080-2002 “standard test method for performance of ordinary concrete mixture” in GB8076-2008. Both of them have the method of “setting time test” and the determination of setting time , GB8076-2008 only uses the drawing fitting method, GB / T50080-2002 provides linear regression and drawing fitting two kinds of parties