表面干湿循环条件下氯盐在碱矿渣混凝土中的传输

Chloride transport in alkali activated slag concretes under chloride intermittent ponding

氯盐侵蚀是引起钢筋混凝土中钢筋锈蚀的主要原因。模拟海工工程浪溅区环境,氯盐在碱矿渣混凝土表面进行干湿循环作用,测试混凝土在不同深度处的氯离子含量,以此探究在最为严苛的环境下氯离子在碱矿渣混凝土中的传输。研究结果表明,在氯盐干湿循环作用下,碱矿渣混凝土各深度处总氯含量和水溶氯含量均明显低于水泥混凝土,反映出前者具有较好的抗氯离子侵蚀能力。碱矿渣混凝土6%-1.50组表现出优越的氯离子结合能力。

Chloride transport in concretes is the main reason inducing corrosion of the embedded steel bars.It simulated splash zone in marine construction by using chloride solution to intermittently pond the concrete surface.Chloride transport in alkali activated slag(AAS)concretes under such the harshest environment was studied by testing chloride contents at different depths of the concretes.The results show that under chloride intermittent ponding,both total and water soluble chloride contents at different depths in AAS concretes were lower than them in PC concrete,indicating that the former had good resistance to chlorides.Further,the AAS concrete 6%-1.50 expressed superior chloride binding capacity.