由正硅酸乙酯（TEOS）,g-缩水甘油醚氧丙基三甲氧基硅烷（GPTMS）作为前躯体,端羟基硅油（PDMS）作为改性剂,通过溶胶凝胶技术制备的一种混凝土耐腐蚀涂层,二月硅酸二丁基锡（DBTL）作为Si—O—Si结构形成的催化剂,红外光谱分析结果说明正硅酸乙酯（TEOS）、g-缩水甘油醚氧丙基三甲氧基硅烷（GPTMS）和端羟基硅油（PDMS）有效地通过化学键形成一种有机/无机复合材料。涂膜后混凝土表面静态接触角由原来的40°增加到90°~110°,吸水率降低90%以上,并随着端羟基硅油的含量增加,疏水性增强。5%NaCl作为盐雾试验源,盐雾试验结果显示复合溶胶有8~14mm的降低氯离子渗透能力,结果说明复合溶胶有效增强了混凝的耐腐蚀能力。
A hydrophobic erosion resistant coating on the surface of a concrete was prepared by sol-gel process.In the process,tetraethyl orthosilicate(TEOS) and 3-glycidoxypropyltrimethoxy-silane(GPTMS) were used as the precursors,hydroxyl-terminated polydimethylsiloxane(PDMS) as the modifier and Di-n-butyltin dilaurate(DBTL) as the catalyst for the siloxanebond(Si—O—Si) formation.FTIR spectra revealed that TEOS and PDMs were fully reacted to form organic/inorganic hybrid material.Water contact angle measured on the concrete surface increased from 40 degree to 90~110 degree,the water absorption capillarity(WAC) reduced by more than 90%.The hydrophobic property of the hybrid sols increased with the content of PDMS.Using 5% NaCl solution as source solution,salt spray test suggested a reduction of 8~14 mm in Cl-penetration depth induced by hybrid sol.The result demonstrated that the hybrid sols increased the erosion resistance of the concrete.
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