Study On Biologic Bituminous Binders And Regeneration Properties

Due to the good economic,environmental and social effects of bio-bitumen,it has been widely concerned by scholars at home and abroad.In order to study the modification and reuse performance of biological asphalt,50# asphalt,70# asphalt,rock asphalt,lake asphalt and SBS modified asphalt were selected as the research objects in this paper.Four kinds of biological bitumen were used as modifier and regenerant to prepare modified bitumen with admixtures of 5%,10%,15% and 20%.The 70# matrix asphalt and SBS modified asphalt were aged by RTFOT.The regeneration performance of aged asphalt was studied.Three indexes of modified asphalt were studied and it was found that biobitumen can improve the penetration,decrease the softening point and decrease the ductility of asphalt.Through the regeneration experiment of aged 70# asphalt and SBS asphalt,the optimum content of four kinds of biological asphalt was determined.For # 70 aged asphalt,8.1% of bio-bitumen A,13.6% of bio-bitumen B,12.5% of bio-bitumen C and 6.5% of bio-bitumen D had better regeneration effect.For SBS asphalt,9.6% of bio-bitumen A,12.6% of bio-bitumen B,9.5% of bio-bitumen C and 11.2% of bitumen D had the best regeneration effect.The viscosity-temperature curve was used to determine the temperature sensitive type of the regenerated asphalt,and the activation energy was calculated to quantify the temperature sensitivity.The results showed that the construction and heterogeneity of the regenerated asphalt were as follows: A biological asphalt was better than D biological asphalt was better than C biological asphalt was better than B biological asphalt.Through DSR test double modulus and phase Angle,the rut factor and fatigue factor determined the rutting resistance,fatigue resistance of the recycled asphalt,get the complex modulus index GTS,intuitive show various biological asphalt regeneration effect,it is concluded that biological regenerant B biological effect on 70 # asphalt recycled asphalt asphalt is better than that of A biological asphalt is better than C biological asphalt asphalt is better than that of D creatures.The regeneration effect of SBS modified asphalt is better than that of bio-bitumen A than that of bio-bitumen D than that of bio-bitumen B.Low temperature cracking performance of recycled asphalt was determined by BBR experiment,stiffness modulus and change rate were adopted,and Tc value was obtained to evaluate the ability of recycled asphalt of biological regenerating agent to resist low temperature cracking.The regeneration effect of SBS modified asphalt A is better than that of biobitumen D is better than that of bio-bitumen b.the regeneration effect of SBS modified asphalt A is better than that of bio-bitumen D is better than that of biobitumen C is better than that of bio-bitumen B.By studying the modification and regeneration properties of bitumen,the present one-sided evaluation of biologic bitumen is made up,and the practicability of biologic bitumen is extended.At the same time,it provides theoretical support for biologic bitumen in modification and regeneration,and provides reference for engineering application.