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混凝土在碳化和干湿循环作用下的抗硫酸盐腐蚀性能

, PP. 127-133

Keywords: 混凝土,碳化,干湿循环,硫酸镁,相对动弹性模量

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Abstract:

采用自然浸泡和干湿循环的试验方法,研究了碳化后的粉煤灰混凝土(FAC)、大掺量矿物掺合料混凝土(HVMAC)及高性能混杂纤维增强膨胀混凝土(HPHFREC)在5%硫酸镁溶液中的损伤过程。结果表明:碳化一定程度上密实了混凝土表层,但改变了混凝土表层的化学组成,降低混凝土的抗硫酸镁腐蚀性能。干湿循环加速硫酸镁的扩散作用,扩展混凝土内部原有的微裂缝。在碳化+硫酸镁双重破坏因素作用下,HVMAC具有优异的抗腐蚀性能,适合应用于硫酸镁腐蚀的严酷环境;在碳化+干湿循环+硫酸镁多重破坏因素作用下,HPHFREC2的三元纤维混杂起到明显的增强增韧效果,抗腐蚀性能较好。

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