Research on the inhibition of alkali efforescence in cement mortar by polyaluminium chloride
LI Lang
ZHANG Yuwei
GAO Yuhui
LIU Yue
CHENG Yan
ZHENG Weiguo
Abstract：This paper proposes to use polyaluminium chloride(PAC)as a new inhibitor and systematically studies its inhibito-ry effect on alkali efflorescence in cement mortar.The mechanism of action of PAC was revealed through characterization methods such as X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS),and thermogravi-metric analysis(TG).The results show that the addition of 5.0%PAC can significantly inhibit alkali efflorescence in cement mortar and maintain the stability of its apparent color for a long time.PAC reduces the alkalinity of the system and introduces Cl-by consuming Ca(OH)2 generated in the early stage of hydration,promoting the conversion of ettringite(AFt)into Friedel salt,thereby reducing the migration of free Ca2+and inhibiting alkali efforescence.In addition,PAC can promote the hydration reaction of trical-cium silicate(C3S)and dicalcium silicate(C2S),optimize the microstructure,and enhance the later compressive strength of mortar.
Keywords：polyaluminum chlorideefforescence inhibitionfriedel salthydrationettringite
Publication Date：2026-02-25
Online Publishing Date：2026-03-25(First online date of this platform, not the publication date of the document)
Pages：4( 98-100,138 )