硫铝酸盐水泥混凝土抗氯离子侵蚀机理分析

摘要

采用欧洲BUILD492《非稳态氯离子迁移试验法》测定普通硅酸盐水泥与硫铝酸盐水泥混凝土的氯离子非稳态扩散系数,应用X射线衍射分析(XRD)、扫描电镜分析(SEM)以及孔结构分析分别对这种水泥水化产物和水泥石内部结构进行研究,并对其抗氯离子侵蚀性能及其抵抗机理进行了研究分析.结果表明:硫铝酸盐水泥是提高混凝土抗氯盐侵蚀性能的一种理想胶凝材料.随着水灰比的降低,硫铝酸盐水泥的抗氯离子侵蚀能力逐渐增强.%For measuring chloride diffusion coefficient of Portland cement concrete and sulphoaluminate cement-based concrete, the method of chloride migration coefficient from non-steady-state experiments is a-dopted. And their cement hydration products and internal structure were researched by the application of X-ray diffraction analysis(XRD) and scanning electron microscopy analysis(SEM). According to the above studies, the resistance to chloride ion erosion of sulphoaluminate cement and the resistance mechanism of the cement were analyzed. The results show that sulphoaluminate cement is an ideal cementitious material which can significantly improve the resistance to chloride ion erosion of the concrete. At the same time, the performance of the cement is gradually improved with the lower water-cement ratio.