The asphalt modified with OMMT/SBR composites were prepared,which the 112#OMMT is chosen,study the impact of OMMT content on the physical properties of the asphalt modified with OMMT/SBR composites,The results show th...The asphalt modified with OMMT/SBR composites were prepared,which the 112#OMMT is chosen,study the impact of OMMT content on the physical properties of the asphalt modified with OMMT/SBR composites,The results show that,the OMMT content is 3%,the physical properties of asphalt modified with OMMT/SBR composites is the best.展开更多
Conventional repairing methods for asphalt pavement have some inconveniences,such as insufficient strength,and are typically time-consuming.To address these issues,this study proposes a new technological method to des...Conventional repairing methods for asphalt pavement have some inconveniences,such as insufficient strength,and are typically time-consuming.To address these issues,this study proposes a new technological method to design and prepare a high-performance assembled asphalt concrete block for fast repair of the potholes.A series of composite modified asphalt binders with 10%crumb rubber(CR)and different dosages(0%,1%,3%,5%)of polyurethane(PU)are examined to determine the optimized binder.Subsequently,the corresponding asphalt mixtures are prepared for further comparison and assessment of engineering properties,such as moistureinduced damage,high-temperature deformation,and low-temperature cracking characteristics.The test results show that PU can significantly improve the high-temperature performance and hardness of(crumb rubber modified asphalt)CRMA binder;3%PU contributes allowing the resistance of CRMA mixture to moisture-induced damage at higher levels,particularly under water whole immersion;as 3%PU is added,the high-temperature rutting deformation resistance of the CRMA mixture increases significantly,and the low-temperature anti-cracking properties are also improved slightly.Therefore,the innovatively designed high-quality assembled fast-repairing asphalt concrete block is recommended as an appropriate option for highway maintenance.展开更多
Waste plastics and rubber have always posed a threat to the environment and a great challenge for disposal.The use of these two waste materials as modifiers for road asphalt provides new road asphalt binders and at th...Waste plastics and rubber have always posed a threat to the environment and a great challenge for disposal.The use of these two waste materials as modifiers for road asphalt provides new road asphalt binders and at the same time provides a new way for waste material resource treatment.Rubber-modified asphalt and plastic-modified asphalt have received widespread attention due to their green and low-carbon characteristics and some performance advantages,but there are still some performance shortcomings that hinder their promotion and application.In order to continue to explore the application of waste materials in the field of road engineering,combined with the performance advantages of both,many scholars began to study the rubber-plastic composite modified asphalt(RPCMA).Therefore,this paper reviewed the different types of waste rubber and plastic,the comprehensive performance of different types of asphalt and its mixture performance,analyzed the modification mechanism of rubber-plastic composite modified asphalt and its performance changes.The results show that rubber-plastic composite modified asphalt is mostly prepared by directly adding modified materials.However,the pretreatment or melt granulation of rubber and plastic will make the performance of rubber-plastic modified asphalt has improved.There is a mutual promotion mechanism between rubber and plastic in asphalt,which makes the performance of rubber-plastic modified asphalt better than that of asphalt obtained by a single modification method(rubber modified asphalt or plastic modified asphalt).In some properties,it can be close to the commercial SBS modified asphalt.The performance of rubber and plastic composite modified asphalt at high temperature has been generally recognized by researchers,but its low-temperature performance is still controversial.Therefore,it is recommended to apply in high-temperature areas.Future work should focus on the development of composite modifiers with stable performance,low cost and ease of use,standardization of modification processes,improvement of low-temperature performance,and monitoring of road performance and environmental impact.展开更多
In recent decades,modified asphalt materials have been used in enhancing the traffic load on the roads.The main objective of this paper is to explore the modifi cation effect of direct coal liquefaction residue(DCLR)o...In recent decades,modified asphalt materials have been used in enhancing the traffic load on the roads.The main objective of this paper is to explore the modifi cation effect of direct coal liquefaction residue(DCLR)on as-phalt binders and investigate the effectiveness of DCLR in improving the performance of asphalt road.This paper prepared modifi ed petroleum as-phalt under diff erent process conditions and tested its penetration,softening point and ductility index.Based on the experimental data,according to gray correlation degree,the performance for the asphalt was compared.The performance for the modified asphalt is simulated and predicted using poly-nomial functions.The modifi ed asphalt was analyzed by FT-IR,TGA,SEM and HPLC.The results show that the optimal process conditions for DCLR modifi ed asphalt are shear mixing time of 45 min,shear mixing tempera-ture of 150℃ and shear mixing rate of 4000 r/min.The predicted fit with the experimental data of 0.993 further demonstrates the effectiveness of the method.The characterization results show no significant chemical change between the DCLR and the asphalt.DCLR can significantly improve the high temperature performance and water stability of the asphalt,but it has little impact on its low temperature performance.展开更多
文摘The asphalt modified with OMMT/SBR composites were prepared,which the 112#OMMT is chosen,study the impact of OMMT content on the physical properties of the asphalt modified with OMMT/SBR composites,The results show that,the OMMT content is 3%,the physical properties of asphalt modified with OMMT/SBR composites is the best.
基金the Scientific Technology R&D Project of CCCC Asset Management Co.,Ltd.(RP2022015294&RP2022015296).
文摘Conventional repairing methods for asphalt pavement have some inconveniences,such as insufficient strength,and are typically time-consuming.To address these issues,this study proposes a new technological method to design and prepare a high-performance assembled asphalt concrete block for fast repair of the potholes.A series of composite modified asphalt binders with 10%crumb rubber(CR)and different dosages(0%,1%,3%,5%)of polyurethane(PU)are examined to determine the optimized binder.Subsequently,the corresponding asphalt mixtures are prepared for further comparison and assessment of engineering properties,such as moistureinduced damage,high-temperature deformation,and low-temperature cracking characteristics.The test results show that PU can significantly improve the high-temperature performance and hardness of(crumb rubber modified asphalt)CRMA binder;3%PU contributes allowing the resistance of CRMA mixture to moisture-induced damage at higher levels,particularly under water whole immersion;as 3%PU is added,the high-temperature rutting deformation resistance of the CRMA mixture increases significantly,and the low-temperature anti-cracking properties are also improved slightly.Therefore,the innovatively designed high-quality assembled fast-repairing asphalt concrete block is recommended as an appropriate option for highway maintenance.
基金sponsored by National Natural Science Foundation of China(No.52308466,No.42271144,No.42071100)Key Research and Development Project of Shaanxi Province(2022SF-328,2022GY-427)+1 种基金the SASAC Science and Technology Innovation Project(JF-23-01-0063)Shaanxi Provincial Transportation Research Project(24-19K,24-20K).
文摘Waste plastics and rubber have always posed a threat to the environment and a great challenge for disposal.The use of these two waste materials as modifiers for road asphalt provides new road asphalt binders and at the same time provides a new way for waste material resource treatment.Rubber-modified asphalt and plastic-modified asphalt have received widespread attention due to their green and low-carbon characteristics and some performance advantages,but there are still some performance shortcomings that hinder their promotion and application.In order to continue to explore the application of waste materials in the field of road engineering,combined with the performance advantages of both,many scholars began to study the rubber-plastic composite modified asphalt(RPCMA).Therefore,this paper reviewed the different types of waste rubber and plastic,the comprehensive performance of different types of asphalt and its mixture performance,analyzed the modification mechanism of rubber-plastic composite modified asphalt and its performance changes.The results show that rubber-plastic composite modified asphalt is mostly prepared by directly adding modified materials.However,the pretreatment or melt granulation of rubber and plastic will make the performance of rubber-plastic modified asphalt has improved.There is a mutual promotion mechanism between rubber and plastic in asphalt,which makes the performance of rubber-plastic modified asphalt better than that of asphalt obtained by a single modification method(rubber modified asphalt or plastic modified asphalt).In some properties,it can be close to the commercial SBS modified asphalt.The performance of rubber and plastic composite modified asphalt at high temperature has been generally recognized by researchers,but its low-temperature performance is still controversial.Therefore,it is recommended to apply in high-temperature areas.Future work should focus on the development of composite modifiers with stable performance,low cost and ease of use,standardization of modification processes,improvement of low-temperature performance,and monitoring of road performance and environmental impact.
文摘In recent decades,modified asphalt materials have been used in enhancing the traffic load on the roads.The main objective of this paper is to explore the modifi cation effect of direct coal liquefaction residue(DCLR)on as-phalt binders and investigate the effectiveness of DCLR in improving the performance of asphalt road.This paper prepared modifi ed petroleum as-phalt under diff erent process conditions and tested its penetration,softening point and ductility index.Based on the experimental data,according to gray correlation degree,the performance for the asphalt was compared.The performance for the modified asphalt is simulated and predicted using poly-nomial functions.The modifi ed asphalt was analyzed by FT-IR,TGA,SEM and HPLC.The results show that the optimal process conditions for DCLR modifi ed asphalt are shear mixing time of 45 min,shear mixing tempera-ture of 150℃ and shear mixing rate of 4000 r/min.The predicted fit with the experimental data of 0.993 further demonstrates the effectiveness of the method.The characterization results show no significant chemical change between the DCLR and the asphalt.DCLR can significantly improve the high temperature performance and water stability of the asphalt,but it has little impact on its low temperature performance.
