冻融损伤条件下水工混凝土渗透性能试验

Tests on the Hydraulic Concrete Permeability Under the Conditions of Freeze-Thaw Damage

氯离子扩散系数是评定混凝土渗透性能的一个重要指标。对水工C30引气混凝土先后进行冻融循环试验和渗透性试验,基于不同冻融损伤程度开展氯离子扩散系数试验,用理论和试验相结合的方式分析冻融损伤对水工混凝土渗透性能的影响。试验结果表明:随着冻融循环次数的增加,损伤程度随之加深,混凝土的密实性逐渐下降,氯离子扩散系数呈线性增长,混凝土抗渗透性能明显下降。

Diffusion coefficient of chlorideion is regarded as an imporetant indicator for concrete permeability. According to the experiment of freeze-thaw damage and chloride penetration on C30 air-entrained hydraulic concrete （ add mineral admixture to enhance the concrete frost resist- ance）, the influence of freeze-thaw damage on the permeability of hydraulic concrete was analyzed. The results show that, with the deepening of freeze-thaw damage degree, the internal damage of concrete increases, compaction drops, the diffusion coefficient of chloride increases linearly arid the permeability of concrete declines obviously.