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旨在揭示水泥稳定再生集料(CSRA)的力学特性及其影响因素。设计了4种不同RCA掺量的CSRA,测试其击实特性、抗压强度、抗压回弹模量、劈裂强度与弯拉强度,并建立强度增长方程及力学指标间的关系方程。结果表明,利用废弃混凝土能够生产出满足现行规范要求的再生集料(RCA),且RCA中含有一定活性的硅酸盐,对CSRA的力学特性存在有利影响。当龄期小于60 d时,CSRA的无侧限抗压强度与抗压回弹模量随RCA掺量的增加先降低后增大,当龄期为90 d时,则随RCA掺量的增加而降低。CSRA的劈裂强度与弯拉强度随RCA掺量的增加而增大。所建立的CSRA强度增长方程可较为精确地表征强度增长特性;当试验条件受限时,利用力学指标关系方程可预估其他力学指标。CSRA用于路面基层中,无侧限抗压强度与劈裂强度满足现行规范要求,RCA掺量可达100%。
The purpose of this study is to reveal the mechanical properties and influencing factors of cement stabilized recycled aggregates (CSRA). Four kinds of CSRA with different RCA content were designed and tested for compaction, compressive strength, compressive resilience modulus, splitting strength and flexural strength, and the relationship between strength growth equation and mechanical index was established. The results show that recycled aggregate (RCA) can be produced by using the waste concrete and the RCA contains certain active silicate, which has a beneficial effect on the mechanical properties of CSRA. When the age was less than 60 days, the unconfined compressive strength and compressive resilience modulus of CSRA first decreased and then increased with the increase of RCA content. When the age was 90 days, the unconfined compressive strength and compressive resilience modulus of CSRA increased with the increase of RCA content Lower. The splitting strength and bending strength of CSRA increase with the increase of RCA content. The established CSRA strength growth equation can characterize the strength growth characteristics more accurately. When the test conditions are limited, other mechanical indexes can be estimated by using the mechanical equation relational equation. CSRA is used in the pavement base. The unconfined compressive strength and splitting strength meet the requirements of current codes. The dosage of RCA can reach 100%.