Study On Adaptability Of Fiber Reinforced Chip Seal In Hot-moist Region Of South China

The rapid development of highway, hot and rainy climate, as well as the increasingtraffic volume in the hot-moist region of South China, have led to the early failure of asphaltpavement, such as crack, pit slot, strength degradation and so on. It is imperative to takeappropriate preventive maintenance to avoid the further development of pavement diseaseand structural damage. As a novel preventive maintenance technology, fiber reinforced chipseal has the advantages of Waterproof, high temperature resistance and convenientconstruction. However, a study on the adaptability of the fiber asphalt pavement surface isnearly blank, the choice of its work environment are also lacking the necessary theoreticalbasis. Therefore, in order to achieve the desired effect of the fiber reinforced chip seal, thepaper considers the traffic conditions, climate and environment. Adaptability study on fiberreinforced chip seal has important theoretical significance and application value.Based on the experiment, this paper have a study of the equivalent elastic modulus ofthe fiber reinforced chip seal firstly. The composite model was constructed to calculateequivalent elastic modulus of fiber reinforced chip seal, the effect of fiber was also analyzedto obtain the material parameters. With the calculation, the best fiber volume fraction,stiffness modulus and dynamic modulus were obtained and lay the foundation formechanical analysis. Secondly, vehicle axle load survey, traffic volume and diseases of thehot-moist region of South China were investigated. The factors, such as different load,interlayer touch types, pavement strength degradation and pavement crack, were consideredin the ANSYS sub-model of the fiber reinforced chip seal. Based on the research of avariety of different loading conditions, the applicable condition on different load and oldpavement was proposed. After analyzing the dynamic friction of asphalt pavement, thedynamic finite element model was built with the software called LS-DYNA, consideringdriving condition of speed, brake and longitudinal slope. The applicable condition ondifferent load and old pavement was proposed. Temperature and solar radiation of the hot-moist region of South China were investigated for pavement temperature field models withcomplex boundary conditions, the mechanical response and rutting was analyzed under thecondition of cyclical temperature and thermal-mechanical coupling. Rainfall of the hot-moist region of South China was investigated for analyzing the effect of hydrodynamicpressure and pore water pressure. Water-saturated crack model in the fiber reinforced chipseal was established according to the principle of fluid-structure coupling. this paperanalyzed effect of the speed and crack length on the crack expansion. Finally, thewaterproof mechanism of the fiber reinforced chip seal was researched and verified withpermeability test, proved that fiber reinforced chip seal has good adaptability to the rainyclimate of hot-moist region of South China.