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- 2017
干湿循环作用下水泥基复合材料抗氯离子侵蚀性能及其微观结构变化
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Abstract:
为了进一步揭示干湿循环条件下氯离子对水泥基复合材料的侵蚀机制，分别研究了两种水灰比水泥混凝土、砂浆及净浆三种层次试件在干湿循环条件下的抗氯离子侵蚀性能。结果发现，干湿循环作用能促进氯离子入侵速度，增加氯离子入侵深度和浓度，并且水胶比越大，干湿循环作用影响效果越明显；掺入矿粉能增加水泥基复合材料抗氯离子入侵性能，并且降低干湿循环作用的影响效果。净浆样品侵蚀前后的微观结构变化表明，干湿循环作用下，经氯盐侵蚀后水泥基复合材料净浆试件表层明显有Friedel盐生成，而矿粉的加入明显增加了样品中Friedel盐的生成量。 In order to further reveal the mechanism of chloride erosion to cement matrix composite materials under dry-wet cycling, the resistance to chloride erosion of two kinds of water to cement ratio of cement concrete, mortar and paste specimens under dry-wet cycling were studied. It is found that dry-wet cycling can promote the intrusion speed of chloride ions and increase its invasion depth and concentration. With the increase of water to cement ratio, the above effect of dry-wet cycling gets more obvious. Furthermore, the incorporation of slag can increase the resistance to chloride erosion of cement matrix composite materials and reduce the invasive effect of dry-wet cycling. Meanwhile, the corresponding micro-structural changes before and after chloride erosion under dry-wet cycling show that Friedel's salt is obvious on the surface of paste samples of cement matrix composite materials and adding slag significantly increases the formation of Friedel's salt in the sample. 国家自然科学基金（51308308）；浙江省自然科学基金（LY17E080009）；水利部水科学与水工程重点实验室（YK914015）
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