Preparation and properties of lightweight fly ash foamed concrete
Lightweight fly ash foamed concrete(FAFC)was prepared by chemical foaming method and partial replacement of cement by fly ash.The effects of foaming agent(H2O2),foam stabilizer(calcium stearate)and fly ash on the dry density,compressive strength and thermal conductivity of FAFC were studied.The pore structure of FAFC was characterized.The results show that with the increase of hydrogen peroxide(H2O2)content,the dry density,compressive strength and thermal conductivity of FAFC decrease,and the porosity and pore size increase.Calcium stearate can optimize the pore structure of FAFC and when its content is 1.8％,light weight,heat preservation and high strength FAFC can be prepared.With the increase of fly ash content,the strength of FAFC decreases gradually,the porosity increases first and then decreases,the dry density and thermal conductivity decrease first and then increase,and the dry density and thermal conductivity of FAFC are the smallest when the fly ash content is 40％.
万方数据
维普
