Effect of Foam Content on Performance of Ultra-Lightweight Magnesium Oxysulfate Foamed Concrete

Abstract

Abstract: Magnesium oxysulfate cement has the advantages of light weight, low thermal conductivity and fire resistance, so it has great market potential to be prepared as foamed concrete and applied in building exterior insulation system. The density of ultra-lightweight magnesium oxysulfate foamed concrete was regulated by incorporating high stability modified foam. The changes in pore structure were investigated through scanning electron microscope (SEM) and optical microscope (OM). Additionally, the effects of density and pore structure variations on the compressive strength and thermal conductivity of ultra-lightweight magnesium oxysulfate foamed concrete were also studied. The results indicate that with the increase of content of high stability modified foam, the number of pores increases and the average pore size significantly decreases. The density of ultra-lightweight magnesium oxysulfate foamed concrete decreases gradually, and the compressive strength gradually decreases as well. When the foam content is 250% (mass fraction), the density of ultra-lightweight magnesium oxysulfate foamed concrete reduces to 88.33 kg/m³, and the thermal conductivity reduces to 0.038 2 W/(m·K).

Key words: ultra-lightweight, modified magnesium oxysulfate cement, foamed concrete, pore structure, thermal conductivity, compressive strength

CLC Number:

TU377.1

LYU Xiating, TAN Hongbo, ZHANG Shixuan, LI Maogao, WANG Jintang, JIAN Shouwei. Effect of Foam Content on Performance of Ultra-Lightweight Magnesium Oxysulfate Foamed Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4262-4270.

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