Influence of Aluminum Sulfate on Calcium Leaching Process of Shotcrete and Its Mechanism
ZHANG Ziwei
NIU Mengdie
LI Guoxin
Abstract：By investigating the performance changes of mortar samples containing aluminum sulfate(AS)in 6 mol/L NH4Cl solution,the influence and mechanism of action of aluminum sulfate on the calcium leaching process of shotcrete were analyzed.The results show that the use level of AS has a significant impact on the calcium leaching process of mortar samples.The addition of 2%AS is beneficial in delaying the performance degradation of mortar samples during accelerated leaching.The leaching process leads to the dissolution of calcium hydroxide in the cement hydration products,the decalcification of calcium silicate hydrate gel and ettringite,and the formation of soluble CaCl2,which accelerates the disintegration of cement stone.The addition of AS alters the composition and structure of cement hydration products,as well as the microstructure of cement stone,thereby influencing the calcium leaching process of shotcrete.
Keywords：calcium leachingaluminum sulfate(AS)acceleratorshotcrete
Publication Date：2025-03-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 244-251 )