码头混凝土中的氯离子侵入研究

对码头的不同构件钻取了一批混凝土芯样,测量了其中CaCO3的含量和氯离子分布,分析了局部环境对碳化和氯离子分布的影响。试验结果表明,在极度潮湿环境下混凝土碳化进展缓慢,且碳化区域以未完全碳化区为主导,混凝土碳化的深度最终趋于一个极限值。局部环境可导致混凝土中氯离子分布发生较大变化,在混凝土表层氯离子侵入方式复杂,可形成一个氯离子含量平稳区段,只有在一定深度内才符合扩散机理。

Chloride Ingress in Concrete of Port Structures

The specimens of concrete cores were drilled from different elements of a pier,and the content of calcium carbonate and chloride distribution from the specimens were measured,based on which,the influences of local environment on carbonation and chloride distribution were analyzed.The test result shows that the carbonation rate is slow in extremely humid environment,and the incomplete carbonation zone is dominate in carbonation zone,the depth of carbonation tends to be a limit.Chloride ions distribution is influenced greatly by local environment,and dry-wet cycles can change the chloride profile evidently and form a constant content of chloride at the layer of concrete.It conforms to the diffusion mechanism only in a certain depth.