通过对9组每组3块商品混凝土立方体试块在9个低龄期(2d、3d、4d、5d、6d、7d、10d、14d、28d)的抗压试验,研究了低龄期混凝土立方体抗压强度的时变规律。对比国内外现有计算方法,拟合出了标准养护条件下低龄期混凝土立方体抗压强度时变计算公式;另外通过对两种不同配合比商品混凝土各9组每组2个共36个拉拔试验,研究了低龄期混凝土粘结强度的时变规律,拟合出了低龄期混凝土粘结强度的时变计算公式。两公式的计算结果与试验结果均吻合较好,可应用于低龄期商品混凝土抗压强度和粘结强度的推算。 The compressive strength of three cubes of commercial concrete cubes at 9 low ages (2d, 3d, 4d, 5d, 6d, 7d, 10d, 14d and 28d) Time-varying intensity. Comparing the existing calculation methods both at home and abroad, the time-varying formula of compressive strength of low-age concrete cubes under standard curing conditions was fitted. In addition, the compressive strength of concrete cubes with different age- The time-varying law of the bond strength of low-age concrete was studied, and the time-varying formula of bond strength of low age concrete was fitted. The calculated results of the two formulas are in good agreement with the test results and can be used to calculate the compressive strength and bond strength of low-age commercial concrete.