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研究冻融循环侵蚀作用下,C25、C35及C50混凝土在不同侵蚀溶液中的抗侵蚀性能变化。结果表明:混凝土试件在蒸馏水环境、硫酸钠溶液及硫酸钠与氯化钠混合溶液经冻融循环300次后,对混凝土的侵蚀破坏依次加强;随着混凝土强度的降低,水灰比逐渐加大,混凝土试件在冻融循环后损伤也逐渐严重;经喷涂聚脲弹性体防护材料的混凝土试件经冻融循环后基本无损伤;冻融循环侵蚀下混凝土由表及里的胀裂是主要问题,在不同盐溶液,这一问题呈现出不同的表现趋势。
The corrosion resistance of C25, C35 and C50 concrete under different freeze-thaw cycles was studied. The results show that the corrosion damage of concrete specimens in the distilled water environment, the sodium sulfate solution and the mixed solution of sodium sulfate and sodium chloride are strengthened by 300 cycles of freeze-thaw cycles. As the concrete strength decreases, the water-cement ratio gradually increases Large and concrete specimens were gradually damaged after freeze-thaw cycles. Concrete specimens sprayed with polyurea elastomer material were almost non-destructive after freeze-thaw cycles. Concrete under freeze-thaw cycling was mainly composed of The main problem, in different salt solutions, presents a different trend of performance.