Microstructural Mechanism of EVA and Silane Emulsion Improving Waterproof Mortar
ZHANG Yanrong
DING Yi
ZOU Zhilong
KONG Xiangming
ZHANG Xuesong
Abstract：Influence of ethylene-vinyl acetate copolymer(EVA)and silane emulsion on the mechanical properties and frost resistance of the high toughness waterproof mortar was investigated through four-point bending test,bonding test,freeze-thaw cycle test,thermogravimetric analysis,mercury intrusion test and scanning electron microscopy.The results show that EVA has little effect on the bending properties at late age,but significantly improves its bonding strength.With the increase of EVA content,the porosity of mortar initially increases and subsequently decreases,and the frost resistance decreases at first and then increases.The inclusion of silane emulsion significantly reduces the adhesion of hydration products on poly vinyl alcohol(PVA)fibers,resulting in the decreasing of bending properties of mortar.By contrast,at high dosages of silane emulsion,the interfacial roughness between fiber and matrix increases obviously,which is beneficial to increasing the bending properties.The incorporation of silane emulsion alleviates the expansion stress caused by water freezing due to the increasing capillary pores,which significately improves the frost resistance.
Keywords：waterproof mortarpolymer emulsionbending propertyfrost resistancemicrostructure
Publication Date：2024-11-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 1060-1070 )