The technical condition of hard shoulder in expressway reconstruction and expansion projects affects the spli-cing method and position of new and old pavement,also related to the social and economic benefits of the project.Based on the reconstruction and expansion project of the Shanghai-Wuhan Expressway,firstly,the structural performance of the hard shoulder pavement was analyzed using representative values of deflection,deflection basin parameters,and deflection ba-sin back calculation modulus;secondly,the mechanical properties of the hard shoulder asphalt surface layer were analyzed using dynamic modulus tests,the crack resistance of the asphalt surface layer was analyzed based on semi-circular bending tests,the water damage resistance of the hard shoulder asphalt surface layer was analyzed using immersion Marshall tests and freeze-thaw splitting tests,the aging degree of the asphalt surface layer was analyzed based on asphalt recovery tests,the me-chanical properties of the base layer were analyzed using unconfined compressive strength and rebound modulus tests;finally,the utilization plan of hard shoulder was analyzed and the pavement structure verification was carried out.
关键词
高速公路/改扩建工程/硬路肩/路面结构强度/路面材料性能
Key words
expressway/reconstruction and expansion project/hard shoulder/pavement structural strength/pavement mate-rial properties
维普
万方数据