关键词: 碱式硫酸镁水泥;泡沫混凝土;化学发泡;导热系数

Abstract: Basic magnesium sulfate cement foamed concrete(BMSCFC)with dry density of 100-500 kg/m3was prepared by light calcined magnesia and magnesium sulfate heptahydrate as raw material, hydrogen peroxide as vesicant.The effects of dry density and fly ash on the physical properties of BMSCFC were studied, and the modified magnesium oxychloride foamed concrete under the same dry density was compared.The results show that with the increase of dry density of BMSCFC,the volumetric water absorption decreases and the thermal conductivity and compressive strength increase.The addition of fly ash increases the compressive strength of BMSCFC,while reducing its insulation performance. When the quality of fly ash occupies 150%of the light calcined magnesia,the dry density is 402 kg/m3, the compressive strength is 2.22 MPa and the thermal conductivity is 0.138896 W/(m· K).Compared with modified magnesium oxychloride foamed concrete, the BMSC-based foamed concrete has better compressive strength and thermal insulation properties.

Key words: basic magnesium sulfate cement;foamed concrete;chemical foaming;thermal conductivity