2011•Advanced materials researchRequires access

Study on the Effect of Waste Gypsum on Hardening Paste Structure and Performances of Lime-Fly Ash

Jia Ying Sun, Yi Xu

Abstract

Based on the experiments, the effect of waste gypsum on the formation of paste structure, the early strength and the stability of lime-fly ash is discussed in the article. As is shown by the results, the early strength of paste was improved by adding waste gypsum into lime-fly ash. The stability of lime-fly ash paste modified by waste gypsum could meet technical requirements when waste gypsum admixture was less than 40%. With the increase of hydration age, the number of ettringite (AFt) and C-S-H gel in paste would increase.

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Key concepts: Gypsum, Lime, Fly ash, Ettringite, Materials science, Waste management, Hardening (computing), Metallurgy