Quantitative characterization experiments on the residual slurry of recycled fine aggregate were carried out,as well as conventional concrete workability tests,rheological properties tests and mechanical properties tests to investigate the effects of different residual slurry mass fractions on the rheological and mechanical properties of recycled fine aggregate concrete.It is found that the removal of residual slurry on the surface of recycled aggregate can significantly improve its basic properties,and the use of recycled fine aggregate will accelerate the slump and expansion loss,increase the yield stress and decrease the plastic viscosity of fresh concrete.As the mass fraction of residual slurry of re-cycled fine aggregate decreases,the compressive strength and splitting tensile of the recycled concrete prepared with it subsequently increase.When the mass fraction of slurry is 14.9％,the aggregate-ce-ment interfacial transition zone is tightly bonded,and the 28 d compressive strength and splitting ten-sile strength of recycled fine aggregate concrete are 28.50 and 2.30 MPa,respectively,which are a-bout 89％and 77％of tho se of normal concrete.Therefore,the recycled fine aggregate with lower re-sidual slurry mass fraction can replace natural sand in concrete applications.
recycled concreterecycled fine aggregateresidual slurry mass fractionrheological prop-ertiesmechanical properties
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