Styrene-butadiene-styrene(SBS)modified asphalt(SA)has long found effective applications in road construction materials.When combined with fillers,SBS-modified asphalt has demonstrated promising resistance to fatigue c...Styrene-butadiene-styrene(SBS)modified asphalt(SA)has long found effective applications in road construction materials.When combined with fillers,SBS-modified asphalt has demonstrated promising resistance to fatigue cracking caused by temperature fluctuations and aging.In this study,molybdenum disulfide(MoS_(2))and polyphosphoric acid(PPA)were ground in naphthenic oil(NO)and subjected to mechanical activation to create PPAmodified MoS_(2),referred to as OMS-PPA.By blending various ratios of OMS-PPA with SBS-modified asphalt,composite-modified asphalts were successfully developed to enhance their overall properties.To assess the mechanical characteristics and stability of these modified asphalts,various methods were employed,including penetration factor,flow activation energy,fluorescence microscopy,and dynamic shear rheology.Additionally,the short-term aging performance was evaluated using Fourier transform infrared(FTIR)spectroscopy and nanoindentation tests.The results revealed a 3.7%decrease in the penetration-temperature coefficient for SAOMS compared to SA,while 1-SA-OMS-PPA showed an even greater reduction of 7.1%.Furthermore,after short-term aging,carboxyl group generation in SA increased by 5.93%,while SA-OMS exhibited a smaller rise of 1.36%,and 1-SA-OMS-PPA saw an increase of just 0.93%.The study also highlighted significant improvements in the hardness of these materials.The hardness change ratio for SA-OMS decreased by 43.08%,while the ratio for 1-SA-OMS-PPA saw a notable reduction of 65.16% compared to unmodified SA.These findings suggest that OMS-PPA contributed to improvements in temperature sensitivity,particle dispersibility,and resistance to shortterm aging in asphalts.The results hold significant promise for the future development of advanced asphalt-based materials with potential high-value applications in flexible pavements for highways.展开更多
Modified asphalt binders are essential for enhancing the performance and durability of pavements.In the pursuit of sustainable road construction,incorporating waste materials,such as scrap automotive rubber and oil-ba...Modified asphalt binders are essential for enhancing the performance and durability of pavements.In the pursuit of sustainable road construction,incorporating waste materials,such as scrap automotive rubber and oil-based by-products,into asphalt binders has gained considerable attention.Scrap rubber,a major environmental concern,can improve the binder's resistance to rutting and moisture damage when used in modification.However,challenges remain in enhancing fatigue and cracking resistance,as well as achieving storage stability.Oil modifiers like waste engine oil,cooking oil,vegetable oil,and pyrolytic oils(derived from waste tires,plastics,and biomasses)improve asphalt's fatigue resistance and low-temperature flexibility.Despite the many advantages of oil-modified asphalt binders,their performance at elevated temperatures remains an area that demands further refinement.Recent advancements focus on hybrid or composite modification strategies that combine rubber and oil to create binders with enhanced performance across a broader temperature range.This approach addresses both high-temperature stability and low-temperature flexibility,offering a more balanced and resilient asphalt pavement solution.The blending method critically influences modifier interaction with asphalt binders,directly impacting material performance and making it essential for optimizing the benefits of composite binder modification.This article highlights how combinations of rubber and oil modifiers hold the potential to revolutionize asphalt technology in the years ahead.The review offers a detailed analysis of the storage stability,chemo-rheological properties,aging resistance of binders,and the influence of blending approaches on the performance of rubber-modified,oil-modified,and composite-modified asphalt binders.The article concludes by outlining significant research gaps and suggesting directions for future studies,emphasizing the crucial role of innovative composite modification methods in enhancing the performance of asphalt binders and supporting sustainable practices in asphalt road construction.展开更多
基金financially supported by the Key Research and Development Program of Hubei Province(Nos.2022BCA077 and 2022BCA082).
文摘Styrene-butadiene-styrene(SBS)modified asphalt(SA)has long found effective applications in road construction materials.When combined with fillers,SBS-modified asphalt has demonstrated promising resistance to fatigue cracking caused by temperature fluctuations and aging.In this study,molybdenum disulfide(MoS_(2))and polyphosphoric acid(PPA)were ground in naphthenic oil(NO)and subjected to mechanical activation to create PPAmodified MoS_(2),referred to as OMS-PPA.By blending various ratios of OMS-PPA with SBS-modified asphalt,composite-modified asphalts were successfully developed to enhance their overall properties.To assess the mechanical characteristics and stability of these modified asphalts,various methods were employed,including penetration factor,flow activation energy,fluorescence microscopy,and dynamic shear rheology.Additionally,the short-term aging performance was evaluated using Fourier transform infrared(FTIR)spectroscopy and nanoindentation tests.The results revealed a 3.7%decrease in the penetration-temperature coefficient for SAOMS compared to SA,while 1-SA-OMS-PPA showed an even greater reduction of 7.1%.Furthermore,after short-term aging,carboxyl group generation in SA increased by 5.93%,while SA-OMS exhibited a smaller rise of 1.36%,and 1-SA-OMS-PPA saw an increase of just 0.93%.The study also highlighted significant improvements in the hardness of these materials.The hardness change ratio for SA-OMS decreased by 43.08%,while the ratio for 1-SA-OMS-PPA saw a notable reduction of 65.16% compared to unmodified SA.These findings suggest that OMS-PPA contributed to improvements in temperature sensitivity,particle dispersibility,and resistance to shortterm aging in asphalts.The results hold significant promise for the future development of advanced asphalt-based materials with potential high-value applications in flexible pavements for highways.
文摘Modified asphalt binders are essential for enhancing the performance and durability of pavements.In the pursuit of sustainable road construction,incorporating waste materials,such as scrap automotive rubber and oil-based by-products,into asphalt binders has gained considerable attention.Scrap rubber,a major environmental concern,can improve the binder's resistance to rutting and moisture damage when used in modification.However,challenges remain in enhancing fatigue and cracking resistance,as well as achieving storage stability.Oil modifiers like waste engine oil,cooking oil,vegetable oil,and pyrolytic oils(derived from waste tires,plastics,and biomasses)improve asphalt's fatigue resistance and low-temperature flexibility.Despite the many advantages of oil-modified asphalt binders,their performance at elevated temperatures remains an area that demands further refinement.Recent advancements focus on hybrid or composite modification strategies that combine rubber and oil to create binders with enhanced performance across a broader temperature range.This approach addresses both high-temperature stability and low-temperature flexibility,offering a more balanced and resilient asphalt pavement solution.The blending method critically influences modifier interaction with asphalt binders,directly impacting material performance and making it essential for optimizing the benefits of composite binder modification.This article highlights how combinations of rubber and oil modifiers hold the potential to revolutionize asphalt technology in the years ahead.The review offers a detailed analysis of the storage stability,chemo-rheological properties,aging resistance of binders,and the influence of blending approaches on the performance of rubber-modified,oil-modified,and composite-modified asphalt binders.The article concludes by outlining significant research gaps and suggesting directions for future studies,emphasizing the crucial role of innovative composite modification methods in enhancing the performance of asphalt binders and supporting sustainable practices in asphalt road construction.
