硅烷复合乳液对水泥基材料中钢筋的防护效果

发布时间：2018-05-19 19:31

本文选题：水泥基材料 + 硅烷防水材料　；参考：《混凝土》2017年12期

【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为主要原料,合成了TEOS/异丁基三乙氧基硅烷复合乳液。利用电化学加速的方法,研究了复合乳液对对水泥基材料中钢筋锈蚀的抑制效果,并通过SEM分析了水泥基材料开裂后的表面形貌,研究了表面元素含量的变化。结果表明:钢筋的阻抗谱特征因电加速时间不同以及钢筋腐蚀程度不同而发生变化,其中涂覆复合乳液的试块,由于抑制了氯离子的侵入,降低了水泥基材料内钢筋表面的氯离子浓度,钢筋初期腐蚀时间较未涂覆时延长了4倍,完全腐蚀时间延长了3.4倍。SEM观察表明,复合乳液可以在水泥基材料表面形成很好的层状保护结构,阻止了外界侵蚀性离子的渗透。
[Abstract]:TEOS/ isobutyl triethoxy silane composite emulsion was synthesized by sol synthesis with tetraethylorthosilicate (TEOS) and isobutyl triethoxy silane emulsion as main raw materials. The inhibition effect of composite emulsion on corrosion of steel bar in cement based materials was studied by electrochemical accelerated method. The surface morphology of cement based material after cracking was analyzed by SEM and the change of surface element content was studied. The results show that the impedance spectrum characteristics of steel bars vary with the time of electric acceleration and the corrosion degree of steel bars, among which the test blocks coated with composite emulsion inhibit the invasion of chloride ions. The initial corrosion time and complete corrosion time of steel bar were 4 times longer and 3.4 times longer than that of uncoated steel bar, respectively. SEM observation showed that the corrosion time of the steel bar in the cement based material was 3.4 times longer than that in the uncoated steel bar, and the total corrosion time was 3.4 times longer. The composite emulsion can form a good layered protective structure on the surface of cement-based materials, which prevents the penetration of external erosive ions.
【作者单位】：青岛理工大学土木工程学院;
【基金】：国家自然科学基金国际合作项目(51420105015);国家自然科学基金资助项目(51308316) 硅酸盐建筑材料国家重点实验室开放基金项目(SYSJJ2016-06) 江苏省土木工程材料重点实验室开放课题(CM2016-04)
【分类号】：TU528

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