泡沫掺量对超轻质硫氧镁基泡沫混凝土性能的影响

摘要/Abstract

摘要： 硫氧镁水泥具有轻质、导热系数低、耐火等优点,将其制备成泡沫混凝土并应用于建筑外墙保温系统具有巨大的市场潜力。本文通过加入高稳定改性泡沫来调控超轻质硫氧镁基泡沫混凝土的密度,并结合扫描电子显微镜(SEM)、光学显微镜(OM)等测试研究了气孔结构的变化,探究了密度和孔结构变化对超轻质硫氧镁基泡沫混凝土抗压强度和导热系数的影响。结果表明:随着高稳定改性泡沫掺量的增加,超轻质硫氧镁基泡沫混凝土的气孔数量增多且平均孔径明显减小,密度逐渐减小,抗压强度逐渐降低;当泡沫掺量为250%(质量分数)时,超轻质硫氧镁基泡沫混凝土的密度降低至88.33 kg/m³,导热系数降低至0.038 2 W/(m·K)。

关键词: 超轻质, 改性硫氧镁水泥, 泡沫混凝土, 气孔结构, 导热系数, 抗压强度

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

中图分类号:

TU377.1

吕夏婷, 谭洪波, 张世轩, 李懋高, 王金堂, 蹇守卫. 泡沫掺量对超轻质硫氧镁基泡沫混凝土性能的影响[J]. 硅酸盐通报, 2023, 42(12): 4262-4270.

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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