关键词: 固废;发泡混凝土;绝干密度;抗压强度;孔隙率

Abstract: Solid waste foamed concrete was prepared by using the ultrafine fly ash and the steel slag as the main raw material with amount of cement and a little of aluminum powder.The influence of some factors including water-solid ratio,aluminum powder content and foaming temperature on the product properties such as dry density,compressive strength,water absorption and porosity were investigated.The results show that with the content of aluminum powder varying from 1‰ to 7‰,the change rate of dry density and compressive strength decrease by about 36％and 84％respectively,while the decreasing rate of water absorption and porosity are about 79％and 30％respectively;when the water-solid ratio increases from 0.65 to 0.95,the change rate of dry density and compressive strength decrease by about 26％and 82％;while,it showes a trend of increasing first and then decreasing for water absorption and porosity,the increasing rate of 34％at first and then with a decrease of 24％for water absorption,the increasing rate of 18％at first and then with the decreasing rate about 9％for the porosity.With the foaming temperature increasing from 25 ℃ to 90 ℃,it showes a trend of decreasing first and then increasing for dry density and compressive strength,the decreasing rate by about 30％at first and then with increasing rate of 60％for the dry density,the decreasing extent by about 50％at first and then with the increasing extent of up to 140％.The optimized conditions: the content of aluminum powder of 1‰-3‰,the water-solid ratio of 65％-75％,the foaming temperature is about 40 ℃.The otherness of the change rate between the compressive strength and the dry density with preparation conditions indicate that it is possible to obtain the foamed concrete products with higher strength and lower density by optimization the preparing condition.

Key words: solid waste;foamed concrete;dry density;compressive strength;porosity