Study On Waterborne Epoxy Based High Friction Course For Asphalt Pavement

With the rapid development of China’s highway construction,the routine work of the pavement maintenance department has shifted from “large-scale construction” to “synchronized construction and maintenance”.The performance and life span of pavements could be improved by pavement preventive maintenance technology(PPMT).PPMT is an important technical means for realizing the preservation of road assets.At present,China’s road maintenance departments have basically accepted the viewpoint of PPMT,and have begun to adopt traditional maintenance techniques such as fog seal,Novachip,and Micro-surfacing to improve pavement performance.However,there are some disadvantages in traditional maintenance techniques,such as complicated construction,insufficient durability,and poor stability at high temperatures.The stiffness and wear resistance of the composite seal have been enhanced,in our study,by adding epoxy resin to ordinary emulsified asphalt.With reference to the sand fog seal technology,a new type of PPMT,named Epoxy Sliding Sealing(EES),was created.For different epoxy content in emulsified asphalt,the material compatibility observation was carried out by Fluorescence Microscope.It shows a stable space skeleton could be established by epoxy resin if resin content is above 50%.The surface profile of epoxy emulsified asphalt was analyzed by Atomic Force Microscope(AFM),which laid the foundation for further analysis of its strength formation mechanism.Polymer materials are sensitive to ultraviolet rays,so their structure is easily damaged and service life would be greatly shorten by high-energy ultraviolet rays.The ultraviolet indoor aging of the epoxy emulsified asphalt is performed in this dissertation,and Scanning Electron Microscopy(SEM)was used to scan the original and aged epoxy emulsified asphalt.The characteristics of aged epoxy emulsified asphalt were analyzed by digital SEM image analysis technology.Based on the abrasion resistance and friction performance of the seal,the Wet Track Abrasion Test and Rub Test were performed to determine the optimal type and size of aggregates,and the optimal proportion of aggregates and epoxy.The curing period of EES is studied by Pull-Off test,and bond strength of traditional PPMT materials and EES were also compared.An EES test road was built by our research team in Foshan City.The patented sealing car and milling car,the EES construction process and quality control measures were introduced in this dissertation.Test results(operated respectively before and after milling work,after work and a half year later)show the anti-sliding performance could be significantly improved,gaps and cracks could be closed by EES,and the seal has good durability.Based on the Life-Cycle Cost Analysis,the economic performance of EES was evaluated.It is shown the benefit-cost ratio of EES is 43.3% higher than traditional sand fog seal technology.