Characteristic Behavior Of High Modulus Asphalt And High Modulus Asphalt Mixtures

High modulus asphalt and high modulus asphalt mixtures are considered tobe essensialengineering materials for solving Chinese heavy traffic and long and steep slope pavementrutting problems presently. Because of late access to China, the researches specialized in highmoudlus asphalt and it's mixtures are very rare and then it's utilization is severely limited. Itis an important aim for road fesearcher to study on the properties and characteristics of highmoudlus asphalt and it's mixtures for a long time. Through combination of SBS and PE, highmodulus asphalt was prepared in this study. And the low temperature and high temperatureperformance of this asphalt have been improved greatly. For high modulus asphalt and it'smixture, their viscoelastic properties, performance characteristics and temperature field ofenvironmental and structural stress analysis are important issues faced to road engineers.This dissertation first analyzed the high modulus asphalt and it's mixtures relatedresearch, and then systematic research was emphasized. By optimizing the preparationprocess, high modulus asphalt with excellent performance was made. After the analysis of theeffect of PE particles on the asphalt system, the mechanism of PE in asphalt was proposed.Using electron microscopy (SEM), differential scanning calorimetry analysis (DSC) andinfrared spectroscopy (FTIR), the modifiers (SBS and PE) distribution in asphalt werestudied.Then, rheology studies of high modulus asphalt were carried out. The modulus andanti-deforamation capacity of high modulus asphalt were found to be far better than SBS andoriginal asphalt. The viscoelastic properties of high modulus asphalt were different fromoriginal asphalt. The addition of PE and SBS could improve the rutting factor significantlyand performance grade of original asphalt and excellent creep properties. Based onviscoelasticity of asphalts, the effects of SBS and PE on the separation of viscocity andelasticity were studied. Measured by dynamic test method, the Zero Shear Viscosity (ZSV)was applied to evaluate the high temperature performance of high modulus asphalt.Through dynamic modulus and static modulus test, wheel track test and other road performance test, the high modulus asphalt mixtures had larger modulus (dynamic modulusand static modulus) after addition of SBS and PE especialy at high temperature. Therefore,two features of high modulus asphalt mixtures were proposed which could be used to verifythe quality of high modulus asphalt mixtures and provide technical information forresearchers.The asphalt mixtures prepared by this dissertation was better than mixtures madeby external addition methods in promoting modulus and dynamic stability, and then themechanism of the two methods was revealed clearly;Adopting three dimensional finite element anlaysis software, after model constructionand analysis of48road structures, the mechanical responses at different load, differenttemperatures and different mechanical parameters were calculated. By coMParative analysis,the C combination (road surface layers made by high modulus asphalt mixtures) was best roadstructure because it had minimum deflection and reasonable shear stress distribution.CoMParing practical engineering applying effects with high modulus asphalt pavement andSBS modified asphalt pavement through test road pavement, high modulus asphalt pavementcan get better road performance.