以TEOS和MTES为前驱体,将盐酸催化的酸性硅溶胶按比例滴入氨水催化的碱性硅溶胶中,用酸碱两步法制备出海洋工程钢筋混凝土纳米硅渗透型防护剂。用透射电镜(TEM)、扫描电镜(SEM)、砂浆渗透深度、砂浆毛细吸水试验及混凝土氯离子电通量试验等手段对渗透型防护剂结构和性能进行了表征。结果表明:用酸碱两步法制备出类核壳结构二氧化硅颗粒溶胶,防护剂处理砂浆表面呈现明显类核壳结构点坑,砂浆渗透深度为1.3 mm,处理4 h表面吸水率降低85%以上,防护剂处理混凝土6h氯离子电通量降低50%以上。 Using TEOS and MTES as precursors, hydrochloric acid-catalyzed acidic silica sol was dropped into ammonia-catalyzed alkaline silica sol proportionally, and a marine engineering reinforced nanosilica permeable protective agent was prepared by acid-base two-step method. The structure and performance of the permeable protective agent were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), mortar penetration depth, mortar capillary water absorption test and concrete chloride ion flux test. The results showed that the core-shell structured silica sol was prepared by the acid-base two-step method. The surface of the mortar treated with the protective agent showed a clear core-shell crater with a penetration depth of 1.3 mm and a decrease of surface water absorption of 85% % Or more, protective agent treatment of concrete 6h chloride ion flux reduced by more than 50%.