In this paper,foam concrete with different density grades was prepared by partially replacing cementitious materials with tailing powder of machine-made sand.The effects of different dosages of tailing powder of machine-made sand on the working performance,me-chanical properties and thermal performance of foam concrete were studied.The results show that when the dosage manufactured sand pow-der is 10％,the 28d compressive strength of A03 and A10 grade foamed concrete is increased by 66.7％and 10.7％respectively.When the dosage of A06 grade foamed concrete is 5％,its 28d compressive strength is increased by 10.5％.With the change of the dosage manu-factured sand powder,the pore structure of foamed concrete is improved to a certain extent.When the dosage is 20％,the thermal conductiv-ity of A03,A06 and A10 grade foamed concrete is reduced by 18.2％,7.4％and 6.9％respectively.
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