To explore the influence of the substitute rate of recycled coarse aggregate(RCA)and strain rate on the discreteness of the compressive strength of recycled aggregate concrete(RAC),RAC specimens with three different RCA substitute rates were prepared for both quasi-static compression and split Hopkinson pressure bar(SHPB)tests.The test results show that despite the limited change in the discreteness of compressive strength of RAC with increasing RCA substitution rate,it still tends to initially increase and then decrease as the RCA substitution rate increases.The results of the SHPB test indicate that both the RCA substitute rate and the strain rate exert a signi-ficant influence on the variability of the dynamic compressive strength of RAC.The dynamic compressive strength discreteness of RAC with the same RCA substitute rate gradually decreases with increasing strain rate,while it increases with increasing RCA substitute rate under the same strain rate.In addition,the traditional Weibull distribution model was modified by introducing the parameters of RCA substitute rate and strain rate,and a dynamic compressive strength prediction formula for RAC with different RCA substitute rates at any given pro-bability level was proposed.
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