Surface strengthening mechanism and anti-permeability of compound potassium/sodium silicate coating on concrete
MENG Xiujian
LIU Wei
CUI Zhaokuan
ZHANG Shuheng
SONG Jiale
LI Weiguang
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 of 68.2%,61.3%,and 34.4%,respectively.
Keywords：concretesurface strengtheningcompound silicategrain sizeanti-permeability
Publication Date：2025-05-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 73-78 )