Silica fume added into soil-based foamed concrete can
greatly increase the strength and improve the thermal insulation
performance. Besides, the soil-based foamed with 20%
silica fume added can be regarded as water-resistant lightweight
concrete. Based on an analysis of the internal microscopic
pores, silica fume improves the aperture distribution,
making pores more uniform and closed circular, which
improves the insulation performance and the strength.