暴露26年后的混凝土的碳化和氯离子分布

CARBONATION AND CHLORIDE DISTRIBUTION OF CONCRETE AFTER 26 YEAR-EXPOSURE

对北海船厂码头的不同构件钻取了一批直径100mm的混凝土芯样。在实验室测量了芯样碳化区域的CaCO3的含量,芯样中的氯离子分布,分析了材料因素和环境因素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。氯离子分布受局部环境条件的影响显著,并可导致芯样表面对流区深度发生较大变化。

The specimens of concrete core with a diameter of lOOmm were drilled from different elements of the dock in Qingdao Beihai Dockyard. The content of calcium carbonate in carbonation zone and chloride distribution from the specimens ware measured. The influence of materials and environments on carbonation and chloride distribution were analyzed. The test results show that the carbonation rate is slow in extremely humid environment, and the incomplete carbonation zone is dominant in carbonation zone, the depth of carbonation tends to a limit. The distribution of chloride ions is influenced evidently by local environment conditions, which can make the depth of convection zone changing widely.