1引言在我国中小城市,商品混凝土尚未完全普及,各施工单位承接的工程工期紧,任务重,试验室用标养28天强度作为调整确定设计配合比的依据,显然不适应现代施工的需要。笔者采用沸水法加速养护混凝土试件强度来推定28天强度,建立了29h推定的砼强度与用标准方法所得砼强度之间的回 1 Introduction In China's small and medium-sized cities, commercial concrete has not yet been fully popularized, the construction unit to undertake the construction period is tight, heavy tasks, laboratory 28 days with the standard intensity as the basis for adjusting the design mix, apparently not suited to the needs of modern construction. The author used boiling water method to accelerate the curing strength of concrete specimens to estimate the strength of 28 days to establish a 29h estimated strength of concrete and concrete strength obtained by the standard method