Experimental Research on the Durability of Foam Concrete Under the Action of Compound Salt
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摘要: 设计泡沫混凝土在氯盐+硫酸盐复合盐溶液作用下侵蚀试验、抗压强度测试、微观试验等,探究复合盐环境对泡沫混凝土质量变化、抗压强度、微观结构等耐久性能的影响。结果表明,复合盐溶液侵蚀作用下,早期试件表面附着有大量白色晶体,试件损伤最早出现在试件棱角处;密度越高的泡沫混凝土在复合盐盐蚀作用后表面损伤越小;在复合盐溶液侵蚀作用下泡沫混凝土试件质量变化率和密度密切相关,且试件质量变化规律总体表现为先增大后减小;泡沫混凝土抗复合盐侵蚀能力随密度的增加而增强,主要表现在试件表观损伤、质量变化及强度变化上;两种盐类之间具有相互作用,Cl-的存在会对硫酸盐腐蚀产生一定的抑制作用。Abstract: A series of tests, including corrosion resistance, compressive strength, and microscopic analysis, were conducted on foam concrete under the combined action of chloride-sulfate composite salt solution. The study investigated the influence of the composite salt environment on the durability of foam concrete, focusing on mass change, compressive strength, and microstructure.The results indicate that under the erosion effect of the composite salt solution, a large number of white crystals formed on the surface of the specimens in the early stages. Additionally, damage to the specimens initially appeared at the edges and corners. The higher the density of foam concrete, the smaller the surface damage would be. The mass change rate of the foam concrete specimens was closely related to their density under the corrosion of the composite salt solution, and the overall mass change trend of the specimens first increased and then decreased. The resistance of foam concrete to compound salt attack increased with the increase of density, which was mainly reflected in the apparent damage, mass change, and strength change of the specimens. There was an interaction between the two salts, and the presence of chloride ions could inhibit sulfate corrosion to some extent.
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Key words:
- foam concrete /
- composite salt /
- corrosion resistance test /
- compressive strength /
- durability
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