Recycled aggregate concrete(RAC)was prepared by double-doped recycled coarse aggregate(RCA)and recycled fine ag-gregate(RFA).The replacement rate of RCA was 50％and 70％,and the replacement rate of RFA was 0,15％,30％,45％,and 60％.The 28 d compressive strength,electric flux,and chloride diffusion coefficient of RAC under different replacement rates of RCA and RFA were analyzed.The performance evolution of RAC compressive strength,mass loss rate,and relative dynamic elastic modulus under dry-wet cy-cle was analyzed,and its resistance to chloride salt erosion was studied.The results show that the double-doped RCA and RFA reduce the 28 d compressive strength of RAC,and increase the electric flux and chloride diffusion coefficient of RAC.When the replacement rates of RCA and RFA are 70％and 60％,the 28 d compressive strength of RAC is only 90.26％of that of natural aggregate concrete(NAC),and its electric flux and chloride diffusion coefficient are 2.74 times and 1.91 times that of NAC,respectively.With an increase in the number of dry-wet cycles,the compressive strength,mass,and relative dynamic elastic modulus of RAC increase first and then decrease.After 40 dry-wet cycles,the compressive strength,mass,and relative dynamic elastic modulus of RAC with RCA and RFA replacement rates of 70％and 60％were 43.96％,2.21％,and 16.00％lower than those of NAC,respectively.Based on the comprehensive analysis of the evalu-ation index of RAC resistance to chloride corrosion,it is suggested that the replacement rate of RCA should be 50％and the replacement rate of RCA should be less than 30％,or the replacement rate of RCA is 70％and RFA is not added,the RAC's resistance to chloride salt erosion will be better.
recycled aggregate concreterecycled coarse aggregaterecycled fine aggregateelectric fluxchloride diffusion coefficient
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