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
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
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
【目的】针对不同特立尼达湖沥青(Trinidad Lake Asphalt,TLA)掺量的苯乙烯-丁二烯-苯乙烯嵌段共聚物(styrene-butadiene-styrene,SBS)复合改性沥青,通过建立宏观和微观性能技术指标体系揭示TLA和SBS提升复合改性沥青性能的作用机理,为...【目的】针对不同特立尼达湖沥青(Trinidad Lake Asphalt,TLA)掺量的苯乙烯-丁二烯-苯乙烯嵌段共聚物(styrene-butadiene-styrene,SBS)复合改性沥青,通过建立宏观和微观性能技术指标体系揭示TLA和SBS提升复合改性沥青性能的作用机理,为沥青路面材料的优化提供理论支撑。【方法】采用试验分析方法,设计了13组不同质量配比的TLA/SBS复合改性沥青试验。通过对复合改性沥青的软化点、针入度、延度等性能指标进行测试并结合微观结构表征,揭示不同的TLA掺量对复合改性沥青性能的影响机理。【结果】TLA掺量的增加能显著地提升复合改性沥青在高温下的稳定性,TLA掺量每增加1%,软化点就提高0.221℃,并且TLA掺量的增加能降低复合改性沥青对温度的敏感性;TLA中的灰分均匀分布形成的粗糙表面与孔隙协同作用,增强了基体的稳定性;根据AC-10型沥青混合料的施工要求,确定TLA和SBS最佳质量比为3∶7;微观分析表明,火山灰质灰分的叠加可增强沥青界面之间的结合,SiO_(2)基矿物的组成及其独特的粒度分布可显著地改善复合改性沥青胶浆的黏韧性,通过调控灰分的分布可显著地改善复合改性沥青的性能。【结论】研究结果可为湿热地区重载交通条件下沥青路面的材料设计与性能提升提供方法和依据。展开更多
Fume suppression mechanisms and the effect of expanded graphite on the performance of asphalt were studied by applying infrared spectroscopy（FT-IR）, X-ray diffraction（XRD）, scanning electron microscopy（SEM） and ...Fume suppression mechanisms and the effect of expanded graphite on the performance of asphalt were studied by applying infrared spectroscopy（FT-IR）, X-ray diffraction（XRD）, scanning electron microscopy（SEM） and comprehensive thermal analysis（TG, DSC）. The experimental results confirm that asphalt which is mixed with expandable graphite will expand in the process of hot mix, and the expanded graphite layer will swell by the light component in the asphalt. The light component in the asphalt and PAHs adsorption on expanded graphite surface or part of the plug in the expanded graphite layer between plates made nucleation crystallization growth. And the Van der Waals force and the bonding of the lattice can effectively restrain the asphalt fume release. Meanwhile, the expanding agent with oxidative can spread into the asphalt, leading to asphalt oxygenated and plastic abate, while the ductility decreases. Expanded graphite, SBS modifier and environment- friendly plasticizers are used to composite modified asphalt. According to asphalt fume release experiment, normal test of asphalt performance, Brookfield viscosity test, RTFOT test and asphalt mixture tests（high temperature stability, low temperature stability, water stability）, it has been proven that the modified asphalt’s performance is better than that of matrix asphalt and equivalent to that of SBS modified asphalt. Furthermore, it has good fume suppression effect.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.
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.
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【目的】针对不同特立尼达湖沥青(Trinidad Lake Asphalt,TLA)掺量的苯乙烯-丁二烯-苯乙烯嵌段共聚物(styrene-butadiene-styrene,SBS)复合改性沥青,通过建立宏观和微观性能技术指标体系揭示TLA和SBS提升复合改性沥青性能的作用机理,为沥青路面材料的优化提供理论支撑。【方法】采用试验分析方法,设计了13组不同质量配比的TLA/SBS复合改性沥青试验。通过对复合改性沥青的软化点、针入度、延度等性能指标进行测试并结合微观结构表征,揭示不同的TLA掺量对复合改性沥青性能的影响机理。【结果】TLA掺量的增加能显著地提升复合改性沥青在高温下的稳定性,TLA掺量每增加1%,软化点就提高0.221℃,并且TLA掺量的增加能降低复合改性沥青对温度的敏感性;TLA中的灰分均匀分布形成的粗糙表面与孔隙协同作用,增强了基体的稳定性;根据AC-10型沥青混合料的施工要求,确定TLA和SBS最佳质量比为3∶7;微观分析表明,火山灰质灰分的叠加可增强沥青界面之间的结合,SiO_(2)基矿物的组成及其独特的粒度分布可显著地改善复合改性沥青胶浆的黏韧性,通过调控灰分的分布可显著地改善复合改性沥青的性能。【结论】研究结果可为湿热地区重载交通条件下沥青路面的材料设计与性能提升提供方法和依据。
基金Funded by the National Natural Science Foundation of China(No.51078372)the Doctoral Program of Higher Specialized Research Foundation(No.20105522110002)
文摘Fume suppression mechanisms and the effect of expanded graphite on the performance of asphalt were studied by applying infrared spectroscopy（FT-IR）, X-ray diffraction（XRD）, scanning electron microscopy（SEM） and comprehensive thermal analysis（TG, DSC）. The experimental results confirm that asphalt which is mixed with expandable graphite will expand in the process of hot mix, and the expanded graphite layer will swell by the light component in the asphalt. The light component in the asphalt and PAHs adsorption on expanded graphite surface or part of the plug in the expanded graphite layer between plates made nucleation crystallization growth. And the Van der Waals force and the bonding of the lattice can effectively restrain the asphalt fume release. Meanwhile, the expanding agent with oxidative can spread into the asphalt, leading to asphalt oxygenated and plastic abate, while the ductility decreases. Expanded graphite, SBS modifier and environment- friendly plasticizers are used to composite modified asphalt. According to asphalt fume release experiment, normal test of asphalt performance, Brookfield viscosity test, RTFOT test and asphalt mixture tests（high temperature stability, low temperature stability, water stability）, it has been proven that the modified asphalt’s performance is better than that of matrix asphalt and equivalent to that of SBS modified asphalt. Furthermore, it has good fume suppression effect.
