Performance Evolution Law and Design System of Long-life Asphalt Pavement Based on One Hundred Million Loading Tests
To develop and verify the design principles and construction technology of long-life asphalt pavement,this study conducted 100 million accelerated loading tests and long-term,high-frequency tracking observations and experimental research of the full-scale test track(RIOHTrack).First,a set of"SIHUA"construction technologies with high engineering reliability and wide applicability,which can significantly improve the durability of asphalt pavement,is proposed and verified,namely"structural design functionalization,material design balancing,construction technology homogenization,and quality control proceduralization."Then,five essential performance evolution laws of asphalt pavement in a wide range of base stiffness are revealed:the coupling effect of load and environment,structural dependence of service performance,inflection point of performance evolution and inverse"S"-shaped trend,the dual damage of pavement T-D cracking and rutting,and the negative thixotropic effect of FWD deflection.Based on the dual-life standards of the long-life pavement including the safety life of structure and functional life of the road surface,as well as the bidirectional fatigue damage mode,a structural system of long-life asphalt pavement in a wide range of base stiffness is established,and the corresponding design principles and indexes are clarified.Taking the structural rigidity and structural modulus as the core,a back-calculation method for the structural layer modulus of the multi-layer system is proposed.This method is based on the FWD deflection basin back-calculation of the four-layer system,and the principles are structural rigidity conservation and uniqueness of the structural layer rigidity response.Finally,based on the inverse"S"evolution trend of service performance,an external factor evolution model is constructed,where the structural rigidity is used as the internal factor index,and the structural modulus is used to determine the mechanical index to solve the structural dependence problem of service performance.As a result,a new model of structural performance evolution that is suitable for the structure in a wide range of base stiffness is proposed,and a design system for long-life asphalt pavement is initially formed.
pavement engineeringlong-life pavementfull-scale test trackwide stiffness rangemoduli back-calculationstructural rigidityperformance evolution model
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