Research On Asphalt Pavement Overlay Thermal Insulation And Super Thin Wear Layer Technology

Under the repeated action of driving load and external environment,candidate asphalt pavement has permanent deformation,anti slip performance and other diseases such as rutting,embracing,passing and so on,reducing the performance and life of pavement and endangering the safety of driving.The traditional methods to solve the above-mentioned diseases of asphalt pavement are mainly to adopt high performance asphalt,high quality aggregate and skeleton dense gradation,which is not ideal in practice.Thin layer repair has become a common measure in pavement maintenance.How to effectively reduce the influence of external temperature change on the pavement structure is the key to maintain the durability of the TLC structure.A feasible method is to effectively prevent the temperature from the external temperature by the TLC material added,so as to control or reduce the occurrence of the high temperature disease of the asphalt pavement.At the same time,the thermal barrier function can also slow down urban heat island effect to a certain extent.In this paper,the heat transfer mode of NBR is analyzed and the influence of thermo physical parameters of thermal resistance resin on the heat transfer performance of the material and the equation of light and heat balance of the pavement are studied.The analysis shows that the ultra-thin wearing layer of thermal resistance resin can theoretically prevent heat from transmitting to the interior of the road and reduce the surface temperature of raw asphalt.Based on the toughening mechanism of NBR,the finite element software ANSYS was used to analyze the stress and strain of the asphalt pavement under the temperature load coupling.It is found that the ultrathin wear layer of the thermal resistance resin can theoretically slow down the deformation of the original asphalt pavement,and the deformation of the thermal resistance resin wear layer is also within its own allowable range,indicating that it can be used for a long time.Secondly,the effects of different butadiene rubber content on the tensile strength,fracture elongation,cooling effect and the bond strength of the asphalt mixture were studied,and the effects of the amount of different butadiene rubber on the cooling performance,road performance and resistance to peeling durability were studied.The optimum dosage of NBR modified epoxy resin is obtained through analysis.At last,in the import and export of Guangxi Cen Shui high speed Changchang tunnel,the test road of ultra-thin wear layer of thermal resistance resin was paved.After more than one year,the performance was excellent and no disease appeared.Moreover,the life cycle cost analysis of the ultra-thin wearing layer of the thermal resistance resin is carried out,and the results show that the economy is good.