硅酸盐通报2026，Vol.45Issue(1)：103-111,9.DOI:10.16552/j.cnki.issn1001-1625.2025.0696
发泡压力对超轻质硫氧镁水泥基泡沫混凝土性能的影响
Effect of Foaming Pressure on Properties of Magnesium Oxysulfate Cement-Based Ultra-Lightweight Foam Concrete
摘要
Abstract
This study proposed a preparation technique for magnesium oxysulfate cement-based ultra-lightweight foam concrete(MOS-ULFC),in which pressure is applied during the prefabricated foaming and slurry mixing stages,followed by pressure release during molding.The pressure differential induced bubble expansion,thereby increasing porosity and achieving ultra-lightweight characteristics.The effects of different foaming pressures on the density,mechanical properties,thermal conductivity,and pore structure of MOS-ULFC were systematically analyzed.Results show that,within the range of 101～160 kPa,increasing the foaming pressure markedly reduces the density and thermal conductivity of MOS-ULFC.When the foaming pressure increases from 101 kPa to 130 kPa,the dry density decreases from 157.81 kg/m3 to 49.22 kg/m3,with a reduction of 68.81%,while the thermal conductivity decreases from 0.069 8 W/(m·K)to 0.037 1 W/(m·K),with a reduction of 46.85%.At 160 kPa,both density and thermal conductivity of MOS-ULFC increase slightly but remaine lower than those of the atmospheric-pressure group(101 kPa).Applying pressure during prefabricated foaming and slurry mixing stages significantly increases the internal pressure of bubbles.Upon returning to atmospheric pressure after molding,the trapped air rapidly expands,leading to a substantial increase in bubble size,and consequently,in average pore size and porosity.Specifically,when the foaming pressure increases from 101 kPa to 130 kPa,the average pore size increases from 78.53 μm to 113.49 μm(an increase of 44.52%),while the total porosity increases from 91.94%to 96.21%.This work provides a new approach for the ultra-lightweight design and preparation of foam concrete.关键词
泡沫混凝土/发泡压力/密度/导热系数/孔结构/超轻质Key words
foam concrete/foaming pressure/density/thermal conductivity/pore structure/ultra-lightweight分类
建筑与水利引用本文复制引用
周宇通,周正,裘吕超,鲁旷达,徐冬梅,张士元,张世轩,蹇守卫,谭洪波..发泡压力对超轻质硫氧镁水泥基泡沫混凝土性能的影响[J].硅酸盐通报,2026,45(1):103-111,9.基金项目
国网浙江省电力有限公司科技项目(5211DS240008) （5211DS240008）
