养护环境对水工长龄期混凝土强度增长规律的影响

Influences of Curing Environment on Strength Growth Rules of Long-age Hydraulic Concrete

研究了在标准养护环境和自然养护环境下,普通硅酸盐水泥、矿渣硅酸盐水泥和掺粉煤灰硅酸盐水泥的长龄期混凝土抗压强度及其增长规律。结果表明:(1)自然环境下混凝土早期强度稍高于标准养护环境下混凝土强度,而后期强度则低于标准养护环境下混凝土的强度;(2)不同养护环境下的混凝土抗压强度与龄期关系均呈对数增长关系;(3)养护环境对硅酸盐水泥混凝土各龄期强度及其增长规律的影响稍大于矿渣硅酸盐水泥混凝土;(4)掺粉煤灰硅酸盐水泥混凝土具有早期强度较低,增长率较小,而后期强度增长速度快,至180 d龄期后仍有一定增长的特性。

The compressive strength and its growth law of ordinary Portland cement concrete, ordinary Portland cement concrete with fly ash and slag Portland cement concrete under standard curing environment and natural curing environment are studied respectively. The results show that,（a） the strength of concrete in early age under natural environment is slightly higher than that under standard curing condition, but the latter strength is lower than that;（ b） under different curing conditions, the relationship between the strength and age is in line with the logarithmic growth;（ c） the effect of curing environment on the strength and its growth law of Portland cement concrete in each age is little more than that of slag Portland cement concrete;（d）the concrete early strength of Portland cement with fly ash is lower and its growth rate is also lower too, however, the later strength growth rate is faster, even to 180 d age, there is still a certain growth.