曹娥江大闸高性能混凝土抗氯离子渗透性能

Ability of high performance concrete of Cao'e River floodgate to resist chloride ion penetration

针对曹娥江大闸枢纽工程的特点,研究普通混凝土和4种配合比高性能混凝土的抗氯离子渗透性能,并进行混凝土抗氯离子侵蚀机理分析及工程寿命预测。自然浸泡法测得高性能混凝土的氯离子有效扩散系数在0.91×10^-12-1.96×10^-12m^2/s之间,试验结果表明：高性能混凝土的氯离子扩散系数显著小于普通混凝土,具有更好的抗氯离子侵蚀性能,能显著延长工程寿命。

According to the characteristics of Cao＇e River floodgate, the ability of ordinary Portland concrete （OPC） and high performance concrete （HPC） to resist chloride ion penetration as well as the mechanism of the concrete to resist the corrosion of chloride ions were investigated, and the service life of the project was predicted. The effective diffusion coefficient of chloride ions in HPC measured by natural marination method was in the range of 0.91 × 10^-12-1.96 × 10^-12 m^2/s. The result of experiments shows that the chloride ion diffusion coefficient of HPC is much smaller than that of OPC. Therefore, HPC is of high ability to resist the corrosion of chloride ions, and it can significantly prolong the service life of the project.