Experimental Study On Properties Of High-Early-Strength Cementitious Grout

Abstract

This paper studied the influences of mineral admixture content on the fluidity, compressive strength and vertical expansion rate of the cementitious grout, which based on a ternary composite cementitious material system of sulfoalminate cement, protland cement and gypsum. The influences of fly ash, slag powder and silica fume were investigated respectively. It was shown that: (1) The initial fluidity grew as the addition of fly ash content in the cementitious grout, 1 d compressive strength and 3 d compressive strength were reduced. (2) The slag powder had great impact on the fluidity, when the content of slag powder more than 18%, initial and 30 min fluidities declined. With the slag powder increased, 1 d, 3 d and 28 d compressive strengths decreased slightly, while 3 h vertical expansion rate increased. (3) The increased of silica fume content made the compressive strengths rised first and then fell. 1 d, 3 d and 28 d compressive strengths could reach their maximum values, when the amount of silica fume was 3.0%.