Research On Performance Of Graphene Oxide(GO)-Bamboo Fiber Composite Modified Asphalt And OGFC Asphalt Mixture

With the introduction of the concept of "sponge city",the open graded friction course(OGFC)with large porosity could alleviate road drainage problems caused by urbanization.However,the high-viscosity asphalt for preparing OGFC asphalt mixture in our country mainly depends on imports,which leads to high construction costs and is not conducive to the popularization and application of drainage pavements.To solve the problem of high-viscosity asphalt depends on imports,and build economical and environmentally friendly roads,the graphene oxide(GO)and bamboo fiber are used to prepare modified asphalt mortar and OGFC asphalt mixture.In addition,comparing them with the TPS high-viscosity asphalt commonly used in engineering and to judge the possibility of them as the high-viscosity asphalt modifiers.Based on the characteristics of good coating force,strong adhesion and anti-stripping ability with high-viscosity asphalt,the adhesion performance of different asphalt binders modified by GO are studied.Simultaneously,the adhesion work,peeling work and compatibility rate between GO modified asphalt and different mineral materials also were analyzed.The results show that the addition of GO can significantly improve the surface free energy of asphalt and its dispersion component,making it with stronger adhesion.Othermore,the adhesion work and compatibility ratio between asphalt and different mineral materials are significantly improved,but the peeling work does not change significantly.Compared with the TPS high-viscosity asphalt,the adhesion of SBS+GO modified asphalt has reached the requirements of high-viscosity asphalt and has the potential to prepare high-viscosity asphalt.To make the GO modified asphalt with higher adhesion,the bamboo fiber with low-cost,renewable,low-pollution,and widely-sourced was used to modify GO modified asphalt.And the physical properties,adhesion properties and synergistic mechanism of composite modified asphalt mortar were studied.The research results show that bamboo fiber could improve the high temperature stability and low temperature crack resistance of asphalt.The bamboo fiber can form a three-dimensional network structure in asphalt mortar by the lap,toughening and bridging,thereby improving the dynamic viscosity at 60℃,viscosity and pull-out strength of asphalt mortar,and improving the adhesion between composite asphalt mortar and aggregate,The Cohesion and high temperature resistance to permanent deformation were also enhanced.In addition,the results of thermal performance analysis suggest that adding bamboo fiber can enhance the elasticity,viscosity and crosslinking density of asphalt at low temperatures,thereby effectively enhancing the low-temperature crack resistance of asphalt mortar.The neutralization chemical reaction and the three-dimensional network structure formed between GO and bamboo fiber make them with a synergistic promotion effect,which could further enhance the high temperature stability,low temperature crack resistance and adhesion performance of asphalt..In order to study the road performance of GO-bamboo fiber composite modified asphalt mortar as the high-viscosity asphalt,the OGFC-13 mineral aggregate gradation determined by volumetric method.The Marshall test,Schellenberg leak test and Cantabro flying test determined that the optimal content of bamboo fiber is 0.3%and the optimum oil-stone ratio of each asphalt mixture.The results show that the addition of GO and bamboo fiber can improve the high temperature stability of OGFC-13 asphalt mixture,the adhesion performance between the asphalt mortar and the mineral aggregate,and the anti-stripping ability of the asphalt on the surface of the aggregate under load.In odditon,each OGFC-13 asphalt mixture with excellently anti-skid performance and drainage performance.The 70#+GO+bamboo fiber modified asphalt and SBS+GO+bamboo fiber modified asphalt mortars and mixtures with the adhesion and the road performance have reached the technical level of similar products TPS high viscosity asphalt in current market.The results illustrate that the two OGFC-13 modified asphalt mixtures by 70#+GO+bamboo fiber modified asphalt and SBS+GO+bamboo fiber modified asphalt have the potential to be used as drainage pavement mixtures.