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为提高再生混凝土建筑物的安全性和耐久性.采用氯化物快速迁移法,研究氯离子对再生混凝土结构的侵蚀作用规律.研究成果表明:再生混凝土结构的水胶质量比、再生骨料取代率、矿物质掺量和硬化龄期等不同因素对抵抗氯离子侵蚀能力有不同程度的影响.控制水胶质量比、掺加无机功能材料和再生骨料强化处理,既可以改善界面过渡区的微观结构,也能够有效阻止氯离子的渗入,使得氯离子迁移系数DRCM降低;在结构表面涂刷保护层、适当增加混凝土保护层厚度和阴极保护,可以推迟钢筋产生电化学腐蚀时间,进而使再生混凝土结构抵抗氯离子侵蚀能力不断得到增强.该研究结果为再生混凝土在建设工程中的推广运用具有一定的实际指导意义.
In order to improve the safety and durability of recycled concrete buildings, chloride rapid migration method was used to study the erosion effect of chloride ions on recycled concrete structures.The results show that the mass ratio of water to rubber and the replacement ratio of recycled aggregates , Mineral content and hardening age have different effects on the resistance to chloride ion erosion.Controlling the mass ratio of water to gel, adding inorganic functional materials and recycled aggregate can not only improve the microstructure of interface transition zone Structure, but also can effectively prevent the infiltration of chloride ions, making the chloride mobility coefficient DRCM reduced; brushing the surface of the protective layer, the appropriate increase in the thickness of the protective layer of concrete and cathodic protection, can delay the electrochemical corrosion time of steel, so that recycled concrete The ability of the structure to resist chloride ion corrosion is continuously enhanced.The results of the study have certain practical guiding significance for the popularization and application of recycled concrete in the construction engineering.