科研之友
微信
新浪微博
Facebook
分享链接
摘要
The 7, 28, 60 and 90 day mechanical properties of CSCRA were experimentally tested, including unconfined compressive strength (UCS), resilient modulus, splitting strength and flexural-tensile strength. According to the test results, the strength growth equations and relation models of mechanical indexes are established innovative. The strength criteria of cement-stabilised recycled concrete aggregate (CSRCA) against fatigue failure was proposed based on load response of pavement, mechanical and fatigue properties of CSRCA as well as Miner's theory of fatigue accumulation. Results showed that when the curing age was smaller than 60 days, the UCS and resilient modulus of CSRCA showed a V-shaped variation with the increase of recycled concrete aggregate (RCA) dosage, and decreased with the increasing of RCA content when the curing age was 90 days. Splitting strength and flexural-tensile strength of CSRCA increased slightly with the increase of RCA dosage. A fatigue equation of CSRCA was established, which reflected that the fatigue life of CSRCA increased slightly with the increase of RCA dosage. The strength growth equations could represent strength growth characteristics of CSRCA accurately. The UCS and splitting strength criteria of CSRCA against fatigue failure were proposed, which were correlated with pavement structure and layer, material properties and service life. It realised the goal of structure-material integrated control of CSRCA base or sub-base fracture.
