Abstract：In order to study a variety of properties of concrete foamed by steel slag and fly ash,the models predicting foamed concrete compressive strength and porosity were also investigated,and the internal structure of foamed concrete was analyzed through experiments. Results show that the foam concrete compressive strength is exponential to its porosity. With the same porosity,the compressive strength of foam concrete can be improved by increasing stomata aperture. The coefficient of thermal conductivity of the concrete formed by steel slag and fly ash is low,500 ~ 900 kg / m³,and the coefficient of thermal conductivity rang is 0. 113 ~0. 113 W /( m·K).

Keyword：foamed concrete;steel slag;fly ash;compressive strength;porosity;