水胶比对大掺量矿物掺合料混凝土耐久性的影响

Influence of Water-binder Ratio on The Durability of Concretes with High Content Mineral Admixtures

本文从抗碳化性能、抗冻性能、抗氯离子扩散渗透性能和抗气体渗透性能四个方面系统研究了大掺量矿物掺合料混凝土在不同水胶比情况下的耐久性能变化规律。结果表明大掺量矿物掺合料混凝土的抗碳化性能、抗冻性能、抗氯离子扩散渗透性能和抗气体渗透性能均随水胶比增大而降低,但其抗气体渗透性系数在早期受水胶比影响较显著,养护90d的大掺量矿物掺合料混凝土气体渗透性系数基本不受水胶比影响。

Four test methods of durability, such as carbonation, frost resistance, chloride diffusion coefficient and gas permeability coefficient were used to study water-binder ratio on the permeability of concretes with high content mineral admixtures. The results showed that, the durability of the high content mineral admixtures concretes decreased with the increasing of the water-binder ratio. For example, the gas permeability coefficient was significantly affected by the water-to-binder ratio at the initial of testing age. However, with the further progressing of curing such as 90 d, he differences decline and the effect of water-binder ratio on the gas permeability coefficient of concretes with high content mineral admixtures more and littler.