Effect of water glass on setting time and mechanical properties of fly ash slag geopolymer

Abstract

In this paper, the effects of different modulus and content of water glass(sodium silicate solution) on the setting time and mechanical properties of geopolymer were studied, and the internal reaction mechanism was analyzed. Studies show that the setting time (initial setting and final setting) of fly ash slag geopolymers increases with the rise of the modulus of sodium silicate solution, and the compressive strength increases first and then decreases with the rise of the modulus. The optimal modulus range is 1.2 ~ 1.5. With the increase of the water glass content, the setting time of the slurry material becomes shorter. When the water glass content increases to more than 20%, the compressive strength tends to decrease. This article analyzes the hydration and solidification reaction process of the polymer of fly ash slag geopolymer under water glass excitation.