Effect of fine aggregate on fluidity and mechanical strengths of wet shotcrete

Abstract

Air entrained wet shotcrete improves the pipeline transportation efficiency of concrete, besides, the characteristics of fine aggregate have different effects on the fluidity and mechanical properties of air entrained wet shotcrete. In this paper, mainly for air-entrained wet shotcrete, the effects of four different properties of fine aggregates on the fluidity and mechanical properties of air-entrained wet shotcrete were studied, especially the two factors of sand ratio and mud content. Fine aggregate properties include mud content (MC), sand ratio (SR), water content (WC) and particle size (PZ). The results showed that the fluidity and mechanical properties of wet shotcrete were the best when the sand ratio of fine aggregate is 0.56 and the water content is 3%; the fine aggregate has a reasonable particle size as far as possible; the montmorillonite contained in the mud inhibited the fluidity and mechanical properties, and the mud content should be kept as low as possible. The paper provides a reference for the practical application of air entraining wet shotcrete, so as to better deal with pipe blockage.