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混凝土结构在硫酸盐侵蚀环境中服役日趋常见,但就硫酸盐侵蚀环境下混凝土防腐技术的研究尚不系统。研究了掺矿物掺合料、液体防腐剂、粉体防腐剂对硫酸盐作用下混凝土轴心抗压强度、抗压耐蚀系数及质量损失的影响,分析了几种防腐技术的作用效果及机理。结果表明,硫酸盐侵蚀环境下,粉体防腐剂、液体防腐剂、矿物掺合料对混凝土抗压强度、抗压耐蚀系数、质量损失率均有所影响;与矿物掺合料相比,防腐剂(特别是粉体防腐剂)的掺加减少了Ca(OH)2、Aft等膨胀型水化产物的生成,显著提升了混凝土抗硫酸盐侵蚀性能。
Concrete structures are becoming more and more commonly used in corrosive environments, but the research on concrete anti-corrosion technology in the environment of sulphate erosion is not systematic. The effects of mineral admixture, liquid preservative and powder preservative on the axial compressive strength, compressive corrosion resistance and mass loss of concrete under sulfate effect were studied. The effects and mechanism of several anticorrosive technologies were analyzed . The results show that under the environment of sulfate attack, the effect of powder preservative, liquid preservative and mineral admixture on the compressive strength, compressive corrosion resistance and mass loss rate of concrete are all affected. Compared with the mineral admixture, The addition of preservatives (especially powder preservatives) reduced the formation of swelling hydration products such as Ca (OH) 2 and Aft, and significantly improved the sulphate corrosion resistance of concrete.