早期湿养护时间对用低品质水泥制备混凝土的后期性能的影响

Influence of Moist Curing Time at Early Ages on the Late Properties of Concrete Prepared by Cement with Low Quality

通过设置3种不同的养护方式,研究了缩短早期湿养护时间对混凝土后期抗压强度和氯离子渗透性的影响规律。研究结果显示:早期湿养护时间缩短,混凝土的后期抗压强度降低、氯离子渗透性增大,用低品质水泥制备混凝土的后期性能降低的幅度大于普通混凝土;掺少量石灰石粉能够减小缩短早期湿养护时间对用低品质水泥制备混凝土的后期性能的不利影响;降低水胶比能够降低混凝土的后期性能对早期湿养护时间的依赖性。

The influence of reducing moist curing time at early ages on the late compressive strength and chloride ion permeability of concrete was investigated by setting 3 different curing conditions.The results show that the late compressive strength and resistance to chloride ion penetration of concrete decrease by reducing the moist curing time at early ages,and the properties of the concrete prepared by cement with low quality decrease much more than those of the normal concrete.The adverse effect of reducing moist curing time on the late properties of the concrete prepared by cement with low quality becomes smaller by adding a small amount of limestone powder to the concrete.Decreasing the water to binder ratio helps decrease the dependence of late properties of concrete on the moist curing time at early ages.