Under the condition that water in wastewater slurry replaces all the mixing water,the effect on the compatibility,com-pressive strength,dry density,drying shrinkage,and thermal conductivity of ceramisite aerated concrete blocks is investigated when the powder in the wastewater slurry replaces in equal amount or the coefficient of 0.65～1.05 replaces some of the fly ash on a conversion basis.The study shows that,when the water-cement ratio is 0.45 and in equal amount the concentration of waste water slurry is 0～18％,the average compressive strength of blocks for 28 d is 5.51～5.54 MPa,the dry density is 728～730 kg/m3,the drying shrinkage val-ue is 0.28～0.41 mm/m,and the thermal conductivity coefficient is 0.137～0.145 W/(m·K);When the concentration of wastewater slurry is 20％,the average compressive strength of blocks at 28 d is 5.18～5.43 MPa after substitution by converting based on coefficient of 0.75～0.95,dry density is 732～743 kg/m3,dry shrinkage value is 0.35～0.42 mm/m,and thermal conductivity coefficient is 0.146～0.178 W/(m·K).At this time,the blocks meet the requirements of JG/T504-2016 for CA5.0B07 blocks.
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