The effect of nano silica modified alkali free quick setting agent on the durability of C30 shotcrete
WANG Liya
SONG Xicheng
LIU Jun
CAI Guisheng
WANG Haijian
WANG Kaiyu
Abstract：Through water penetration resistance and freeze-thaw resistance tests,the influence of alkali-free accelerators containing nano-silica on the durability of C30 shotcrete was investigated,and the effects of different dispersion methods of nano-silica on the properties of the concrete were compared.The results show that compared with ordinary accelerators,the addition of nano-silica accelerators reduces the electrical flux and average water penetration height of the concrete,increases the elastic modulus,and reduces the mass and compressive strength loss rates.This indicates that the alkali-free accelerators containing nano-silica can improve the water penetration and freeze-thaw resistance of the concrete and effectively inhibit the enlargement of air bubbles within the concrete.Moreover,pre-dispersing nano-silica in the accelerator achieves better results compared with the external addition of nano-silica.
Keywords：alkali free rapid setting agentnano silicashotcretedurability
Publication Date：2025-04-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 38-41,60 )