生土泡沫混凝土试验研究

Experimental Research on Immature Soil-Based Foam Concrete

以生土作为填料,制备了生土泡沫混凝土.试验研究了生土泡沫混凝土的干表观密度、抗压强度、导热系数、孔隙分布和吸湿特性,探讨了微硅粉对生土泡沫混凝土抗压强度和导热系数的影响.结果表明:生土泡沫混凝土干表观密度、抗压强度和导热系数均随着泡沫掺量(体积分数)的增大而减小;随微硅粉掺量(质量分数)增大,生土泡沫混凝土抗压强度和保温隔热性能同时得到改善.利用生土作填料,同时掺加20%微硅粉,可以制备出干表观密度、抗压强度和导热系数分别为790kg/m3,7.8MPa及0.156W/(m·K)的性能优异的生土泡沫混凝土(泡沫掺量为60%).泡沫掺量75%的生土泡沫混凝土(未掺微硅粉)的纳米级孔隙量低,吸湿能力小.

Immature soil was used as filler to prepare immature soil-based foam concrete.The properties,such as dry apparent density,compressive strength,thermal conductivity,pore structure and moisture absorption characteristic of immature soil-based foam concrete were experimentally researched.The effect of silica fume on compressive strength and thermal conductivity of immature soil-based foam concrete was studied as well.The experimental results indicate that the dry apparent density,compressive strength and thermal conductivity of immature soil-based foam concrete decrease with increasing use level（by volume）of foam.The compressive strength and thermal insulation of immature soil-based foam concrete are both improved with increasing use level（by mass）of silica fume.Moreover,the immature soil-based foam concrete（60%foam）with a dry apparent density of 790kg/m3,compressive strength of 7.8 MPa,and thermal conductivity of 0.156W/（m·K）is produced to use immature soil as filler and with addition of 20%silica fume.Nanoscale pore volume of immature soil-based foam concrete with 75% foam（without silica fume added）is low,and its moisture absorption ability is low also.