Performance Evaluation Of Bio-polymer Modified Asphalt Concrete Mixture

Performance evaluation of waste cooking oil-based bio-polymer modified asphalt and asphalt concrete was investigated in this sturdy. Modified asphalt binders were prepared by adding five contents of bio-polymer into the control binder. Firstly FT-IR, Thermogravimetric Analysis(TG) and Derivative Thermogravimetric Analysis, Differential Scanning Calorimetric, and the penetration test at 15℃, 25℃, and 30℃ were conducted In order to investigate the chemical, physical and thermal characteristics of bio-polymer. FT-IR was performed on bio-polymers, biodiesel by-product and control asphalt in order to investigate their chemical composition. Thermogravimetric analysis(TG) and derivative Thermogravimetric analysis(DTG) were performed on bio-polymers and asphalt binder in order to determine their thermal stability. DSR test was performed on bio-polymers in order to investigate their thermal properties(glass transition temperature, melting point, crystallinity). Penetration test was performed on bitumen and Bio-polymers at 15℃, 25℃, and 30℃ to investigate their consistency. Then, empirical tests such as penetration test, softening point test and Superpave performance tests including, dynamic shear rheometer test for virgin binder and rolling thin film oven-aged binder, bending beam rheometer test for PAV-aged asphalt were carried out to investigate the effect of bio-polymer on physical and rheological properties of control asphalt binder.Wheel tracking test at high temperature and bend test at low temperature were conducted on asphalt concrete when used modified and unmodified binder to evaluate the effect of bio-polymer on the rutting resistance and thermal resistance of asphalt concrete. Finally the effect of binder’s modulus variation on asphalt concrete modulus was investigated with the Hirsh model. The FT-IR test results indicated that Bio-polymers and base asphalt have saturated hydrocarbons and amides. Besides, Bio-polymers, have lipids and aromatic compounds while base asphalt has sulfinyl compounds in difference. Meanwhile, the addition of bio-polymer reduced the softening point and increase the penetration grade of the asphalt binder. Moreover, the addition of bio-polymer decreased the high-temperature performance of asphalt binder, while improved the low-temperature performance. In addition, the bio-polymer decrease the dynamic stability of asphalt concrete mixture while increase the stiffness modulus of asphalt concrete mixture in this sturdy. The Hirsh model predictive results indicated that adding 5%, 8% and 10% bio-polymer can decrease the dynamic modulus of asphalt concrete by less than 5%, 10% and 15%. Finally,considering the performance variations of bio-polymer asphalt and environmental requirements, the content of bio-polymer recommended to be used as PG58-28 asphalt binder’s modifier in cold region was 8%.