The splitting strength,dynamic resilience modulus and shear strength of cold recycled foam asphalt structural layer during its service period of 9 years were tested based on core sampling tests at hard shoulder,carriageway and overtaking lane combined with the test section of the Xindong Road reconstruction and expansion project in Guiyang City.The mechanical properties,shear resistance and distribution of the cold recycled mixture of in-service foam asphalt were analyzed.The results show that with the increase of service life,the splitting strength,dynamic resilience modulus and cohesiveness of the core of the cold recycled foam asphalt pavement structure are not decreased but increased.The increase of the strength of cold recycled mixture of foam asphalt during service is related to factors such as the bond strength of old and new asphalt after infiltration and fusion and the redistribution of old and new asphalt in cold recycled foam asphalt.
关键词
道路工程/冷再生/现场测试/性能研究/演化规律/低碳环保/耐久性
Key words
road engineering/cold recycled/field testing/performance research/evolution law/low carbon and environmental protection/durability
维普
万方数据