The research and development of high-performance pavement materials has been intensified owing to the demand for long-life pavements.This study is performed to develop a novel pavement material using waste rubber powd...The research and development of high-performance pavement materials has been intensified owing to the demand for long-life pavements.This study is performed to develop a novel pavement material using waste rubber powder,waste lubricating by-product(LBP),and asphalt.Subsequently,the aging properties and aging mechanism of activated waste rubber powder modified asphalt(ARMA)are investigated based on its rheological properties and microcharacterization.The rheological results show that,compared with waste rubber powder modified asphalt(RMA),ARMA offers a higher aging resistance and a longer fatigue life.A comparison and analysis of the rheological aging parameters of ARMA and RMA show that LBP activation diminishes the aging sensitivity of ARMA.The microcharacterization result shows that the aging of ARMA may be caused by the fact that LBP-activated waste rubber powder is more reactive and can form a dense colloidal structure with asphalt.Therefore,the evaporation loss of asphalt light components by heat and the damage to the colloidal structure by oxygen during the aging process are impeded,and the thermal-oxidative aging resistance of ARMA is improved.展开更多
Several previous studies have documented the progress in polymer modified asphalt binder with respect to materials'types and properties.However,limited or no effort was made to document findings on the laboratory ...Several previous studies have documented the progress in polymer modified asphalt binder with respect to materials'types and properties.However,limited or no effort was made to document findings on the laboratory preparation practices of polymer modified asphalt binder.Full and clear disclosure of asphalt blend preparation method is necessary for research continuity,reproducibility,and accurate adaptation by future studies for analogy and reliable conclusions.The laboratory preparation processes of various modified asphalt binders have been reviewed in this study.Factors affecting the optimal mixing of asphalt-polymer blends were summarized.The optimal mixing conditions associated with different asphalt modifiers were documented.Gap in the literature on the current practice for the preparation and reporting of various modified asphalt binder was discussed.Modifiers include styrene butadiene styrene(SBS),polyethylene(PE),waste tire rubber or crumb rubber(CR),ethylene vinyl acetate(EVA),sulfur,polyphosphoric acid(PPA),epoxy,polyurethane,nano-materials,etc.Currently,there is lack of modern innovative approached in the preparation of modified asphalt towards better performance.There is no clear standardized definition of term associated with asphalt binder preparation process.Given the limited and common types of polymers utilized for the modification of asphalt binder,it is possible to standardize the mixing procedure for several polymers.Doing so could ease research continuity and facilitates accurate comparison of new studies with earlier ones.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.51778136)the Technology Research and Development Project of China Railway(No.J2019G003)The authors would like to thank the staff at the National Demonstration Center for Experimental Road and Traffic Engineering Education(Southeast University)for their active contributions to this study.
文摘The research and development of high-performance pavement materials has been intensified owing to the demand for long-life pavements.This study is performed to develop a novel pavement material using waste rubber powder,waste lubricating by-product(LBP),and asphalt.Subsequently,the aging properties and aging mechanism of activated waste rubber powder modified asphalt(ARMA)are investigated based on its rheological properties and microcharacterization.The rheological results show that,compared with waste rubber powder modified asphalt(RMA),ARMA offers a higher aging resistance and a longer fatigue life.A comparison and analysis of the rheological aging parameters of ARMA and RMA show that LBP activation diminishes the aging sensitivity of ARMA.The microcharacterization result shows that the aging of ARMA may be caused by the fact that LBP-activated waste rubber powder is more reactive and can form a dense colloidal structure with asphalt.Therefore,the evaporation loss of asphalt light components by heat and the damage to the colloidal structure by oxygen during the aging process are impeded,and the thermal-oxidative aging resistance of ARMA is improved.
文摘Several previous studies have documented the progress in polymer modified asphalt binder with respect to materials'types and properties.However,limited or no effort was made to document findings on the laboratory preparation practices of polymer modified asphalt binder.Full and clear disclosure of asphalt blend preparation method is necessary for research continuity,reproducibility,and accurate adaptation by future studies for analogy and reliable conclusions.The laboratory preparation processes of various modified asphalt binders have been reviewed in this study.Factors affecting the optimal mixing of asphalt-polymer blends were summarized.The optimal mixing conditions associated with different asphalt modifiers were documented.Gap in the literature on the current practice for the preparation and reporting of various modified asphalt binder was discussed.Modifiers include styrene butadiene styrene(SBS),polyethylene(PE),waste tire rubber or crumb rubber(CR),ethylene vinyl acetate(EVA),sulfur,polyphosphoric acid(PPA),epoxy,polyurethane,nano-materials,etc.Currently,there is lack of modern innovative approached in the preparation of modified asphalt towards better performance.There is no clear standardized definition of term associated with asphalt binder preparation process.Given the limited and common types of polymers utilized for the modification of asphalt binder,it is possible to standardize the mixing procedure for several polymers.Doing so could ease research continuity and facilitates accurate comparison of new studies with earlier ones.
