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对比了采用不同拌合用水(自来水和海水)及细骨料(河砂、淡化海砂、海砂)拌合的碱矿渣混凝土(AAS)和水泥混凝土(OPC)在模拟海水浸泡过程中的强度变化,同时通过电化学法加速钢筋锈蚀,研究了AAS混凝土中钢筋早期锈蚀状况。结果表明:在Cl-侵蚀过程中,经蒸压养护的AAS混凝土表现出比OPC混凝土更高的强度性能和更优异的耐腐蚀性能。在42d测试龄期时,OPC混凝土中钢筋锈蚀情况明显比AAS混凝土严重,钢筋失重率约为5%~9%,而AAS混凝土的钢筋失重率仅为0.2%~1.5%。同时还借助SEM测试方法分析探索了蒸压养护下AAS混凝土性能优越的机理。
The strength of alkali slag concrete (AAS) and cement concrete (OPC) mixed with different mixing water (tap water and seawater) and fine aggregate (river sand, desalinated sea sand and sea sand) Change, at the same time accelerate the corrosion of reinforced bar by electrochemical method, and study the corrosion status of rebar in AAS concrete. The results show that autoclaved AAS concrete exhibits higher strength properties and superior corrosion resistance than OPC concrete during Cl-erosion. During the test period of 42d, the corrosion of rebar in OPC concrete was significantly worse than that of AAS concrete. The weight loss of rebar was about 5% ~ 9%, while that of AAS concrete was only 0.2% ~ 1.5%. At the same time, the mechanism of AAS concrete with superior performance under autoclave curing was explored by means of SEM test.