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对暴露21年的挡浪坝和预制混凝土扭工字块钻取了一批直径100 mm的混凝土芯样。在实验室测定了芯样中的碳酸钙含量和氯离子分布;通过压汞试验测定了混凝土表层和内部的孔结构;分析材料因素和环境因素对碳化及氯离子分布的影响。结果表明,在相对湿度较高时,混凝土碳化十分有限,且以未完全碳化区为主导;实际暴露混凝土中氯离子侵入深度不大;暴露混凝土表层与内部的微观结构差异明显,混凝土进一步水化和海水中的物质对表层混凝土的填充对氯离子侵入混凝土内部有阻碍作用。
A batch of concrete cores with a diameter of 100 mm were drilled for the 21-year-old retaining bars and precast concrete twist blocks. The calcium carbonate content and chloride ion distribution in the core sample were measured in the laboratory. The pore structure in the surface and the interior of the concrete was determined by mercury intrusion test. The effects of material and environmental factors on the distribution of carbonation and chloride ion were analyzed. The results show that the carbonation of concrete is very limited when the relative humidity is high, and it is dominated by the incompletely carbonized zone. However, the depth of chloride ion intruded concrete is not large. The microstructure of the exposed concrete surface is obviously different from that of the concrete, and the concrete is further hydrated And seawater substances on the surface of the concrete filling of chloride ions invade concrete interior has an impediment.