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研究了干湿循环-硫酸盐侵蚀耦合作用下,纯水泥混凝土、粉煤灰掺量10%和20%的粉煤灰混凝土及矿粉掺量15%和30%的矿粉混凝土的质量损失率、抗压强度和氯离子扩散系数的演变规律。采用X射线衍射、扫描电子显微镜、能谱分析研究了侵蚀后试件的微观形貌与物质元素组成。结果表明干湿循环-硫酸盐侵蚀耦合作用下混凝土性能发展分为2个阶段:即侵蚀初期性能的提高段与随后性能的劣化段;矿物掺和料的掺入不能改善混凝土的抗干湿循环-硫酸盐侵蚀性能。
The effects of dry-wet cycle-sulphate erosion on the mass loss ratio of pure cement concrete, fly ash concrete with 10% and 20% fly ash and slag concrete with 15% and 30% , Compressive strength and chloride ion diffusion coefficient evolution law. X-ray diffraction, scanning electron microscopy and energy spectrum analysis were used to study the microstructure and material composition of the eroded specimens. The results show that the performance of concrete under dry-wet cycle coupled with sulfate erosion is divided into two stages: the initial section of the initial stage of erosion and the later stage of deterioration; the incorporation of the mineral admixture can not improve the resistance of the concrete to dry-wet cycles Sulfate attack properties.