【摘要】 将硅酸钾与硅酸钠复配溶液作为混凝土表面强化材料，采用Zeta电位研究了复配溶液胶体粒子的基本特性，通过扫描电镜和FT-IR探究经强化后砂浆试件的表面形貌及成分变化，明确其作用机理，通过透气性、渗水高度和毛细吸水试验评价表面强化效果。结果表明：经复配硅酸盐溶液处理后，试件中Ca（OH）₂含量减少，水化硅酸钙凝胶（C-S-H）含量增多；当m（硅酸钠）∶m（硅酸钾）=2∶8时，胶体粒径和电位最大，凝胶含量最多，涂层致密性最佳；与未处理试件相比，吸水率、24 h渗水高度和576 h水蒸气挥发量分别减小了68.2%、61.3%、34.4%。更多还原

【Abstract】 In this study,composite potassium silicate and sodium silicate were used as surface strengthening materials for concrete. Zeta potential was employed to investigate the basic properties of colloidal particles in the composite solution. Scanning electron microscopy and FT-IR were used to analyze the surface morphology and composition changes of the reinforced mortar specimens. The effects of surface strengthening were assessed through air permeability,water permeability,and capillary water absorption tests. The results revealed a decrease in Ca（OH）₂ content and an increase in calcium silicate hydrate（C-S-H）-gel content following treatment with the composite silicate solution. When the sodium silicate to potassium silicate ratio was 2 ∶8,the colloidal particle size and potential were maximized,the gel content was highest,and the coating density was optimal. Compared to the untreated specimens,the capillary water absorption,24-hour liquid level infiltration,and 576-hour gas spill rate showed reductions of68.2%,61.3%,and 34.4%,respectively.更多还原