Structural Behavior And Material Design Of Fiber Reinforced Chip Seal

By the end of2011, the highway traffic mileage of our nation has reached4.05millionkilometers. Because we attach importance to highway construction than maintenance, thepremature damage especially asphalt pavement surface feature decay of highway iswidespread. In order to regeneration pavement surface features and prevent the developmentof pavement damage, the pavement need preventive conservation. Fiber reinforced chip sealis a new asphalt pavement preventive maintenance technology，which has more advantages inperformance and efficiency than similar preventive maintenance. But it lacked a clearunderstanding of it’s structural behaviour, appropriate evaluation index system has not beenestablished and material composition design methods has not formed. In this paper, for thekey problems in the theory and application of technology, researches on road behaviormechanism and material design, and focus on exploring crack resistance and resistance tohydrodynamic in theory, have important theoretical and practical significance for thedevelopment and application of this new technology.By finite element analysis, using of statics and dynamics, respectively calculating themechanical response of fiber reinforced chip seal road under static and dynamic loads, andprovide a basis for fiber reinforced chip seal design. For exploring the mechanism of fiberreinforced chip seal crack behavior, based on composite materials and fracture mechanicstheory, by image analysis techniques，to calculate and analyze the fracture toughness of fiberreinforced chip seal and the stress intensity factor of asphalt road surface crack，and exploreresistance behavior law in the crack tip stress. Combination of work environment, the waterdamage mechanism is firstly analyzed theoretically. Dynamic permeable test instrument andmoving water pressure flushing tester are invented for depth study of fiber reinforced chipseal anti-hydrodynamic behavior. Taking advantage of these new equipments, throughdynamic permeable test under different material conditions, variation of Seal coat materialsbehavior and performance are discussed, and fiber reinforced chip seal performance controlindicators under moving water effect is propose. Applicable conditions and the bestmaintenance timing method based on fiber reinforced chip seal are determined，by analyzing impact of the fiber reinforced chip seal work environment to performance, and focus on theadaptability to the natural environment, traffic conditions, as well as the old road trafficthrough theoretical analysis and finite element calculation.System theory is led into research on fiber reinforced chip seal material compositiondesign. According to system theory, fiber reinforced chip seal design methods can be dividedinto three levels, asphalt layer material design, fiber asphalt layer design and fiber reinforcedchip seal design. Through theoretical analysis and experimental study, fiber reinforced chipseal multi-index control system are proposed, considering Interlayer shear strength as controlindex of bonding properties, considering the strength under hydrodynamic pressure asimpermeability indicators, considering the material removal rate as adhesion properties index,considering structure depth as slip resistance index and fiber reinforced chip seal designmethod and process based on system theory are proposed. Relying on entity engineering, testroad was paved through the application of fiber reinforced chip seal design, and a depth studyon construction process control technology was carried out.