English：

In order to improve the performance of recycled aggregate concrete compared to naturalaggregate concrete, low calcium bentonite with a mass substitution rate of 0, 5%, 10%, 15%, and 20%was used to replace ordinary portland cement to prepare specimens. The workability, fresh mix density,air content, compressive strength, and splitting tensile strength tests were conducted. The experimentalresults show that the workability of recycled aggregate concrete is higher than that of natural aggregateconcrete. As the amount of bentonite increases, the workability of both natural aggregate concrete andrecycled aggregate concrete decreases. When other conditions are the same, the air content of recycledaggregate concrete is relatively higher than that of natural aggregate concrete. When high-efficiency waterreducing agents are not used, the air content of natural aggregate concrete and recycled aggregateconcrete increases with the increase of bentonite content. When using high-efficiency water reducingagents to achieve the target slump, compared with the corresponding control group, the air content ofnatural aggregate concrete and recycled aggregate concrete decreases with the increase of bentonitecontent. Under the same conditions, the density of recycled aggregate concrete is lower than that ofnatural aggregate concrete. When no high-efficiency water reducing agent is added, adding bentonite willreduce the density of fresh recycled aggregate concrete and natural aggregate concrete. When adding ahigh-efficiency water reducing agent with the target slump dosage, the addition of bentonite will increasethe density of fresh recycled aggregate concrete and natural aggregate concrete. The addition of bentonitesignificantly improves the later strength of recycled aggregate concrete aggregates. When the replacement rate of bentonite is 15%, the tensile and compressive strength of recycled aggregate concrete and naturalaggregate concrete increase the most.