摘要： 采用溶胶合成法,以正硅酸乙酯(TEOS)与异丁基三乙氧基硅烷乳液制备TEOS/异丁基三乙氧基硅烷复合渗透型防水材料,保证硅烷乳液稳定性的同时提高了乳液中的硅烷含量。通过混凝土毛细吸盐、快速氯离子迁移系数法,对比研究了异丁基三乙氧基硅烷乳液、TEOS、TEOS/异丁基三乙氧基硅烷复合乳液对混凝土抗氯离子渗透性能的影响。结果表明:TEOS/异丁基三乙氧基硅烷复合乳液对混凝土抗氯离子渗透能力最强,且将氯离子向混凝土的渗透深度控制在5 mm以内。与未经过涂覆处理的空白试块相比,其在混凝土(强度等级分别为C40和C50)浅表层的氯离子含量分别降低了69.38%和56.39%。在快速氯离子渗透试验中,复合乳液也表现出优异的防护效果,与空白试块相比渗透深度分别下降71.71%和71.15%,氯离子扩散系数分别降低83.67%和83.33%。

关键词: 混凝土, 硅烷, 正硅酸乙酯, 毛细吸盐, 氯离子扩散

Abstract: A new kind of permeable waterproof material had been synthesized from tetraethyl orthosilicate (TEOS)and isobutyl triethoxysilane as raw materials through sol synthesis in this paper. The stability of the prepared emulsion was ensured, meanwhile, the silane content in the emulsion was increased The effect of EOS, isobutyl triethoxysilar emulsion and TEOS-isobutyl triethoxysilane composite emulsion on capillary chloride absorption and chloride permeation resistance of the coated concrete were studied The result showed that composite emulsion was the most excellent when the concrete surface was coated. Furthermore the penetration depth of chloride ion into concrete is controlled within 5 mm. The chloride content at the surface of concrete strength grade of C40 and C50)was decreased by 69.38% and 56.39%. Chloride permeation resistance test results showed that the composite emulsion strengthened the protective effect of the coated concrete. The penetration depth of chloride ion into concrete was decreased by 71. 70% and 71. 15%, and diffusion coefficient of chloride ion was decreased by 83. 67% and 83.33% respectively as compared to the control samples.

Key words: concrete, silane, TEOS, capillary chloride absorption, chloride ion diffusion