The impact of temperature on the mechanical properties and thermal susceptibility of the railway bituminous sub-ballastlayer, has served as motivation to develop the advanced measurement of thermal cycles in this laye...The impact of temperature on the mechanical properties and thermal susceptibility of the railway bituminous sub-ballastlayer, has served as motivation to develop the advanced measurement of thermal cycles in this layer and, an evaluation of the averageseasonal temperatures interpolated by sinusoidal functions, of which characteristic parameters are determined. According to weathersituation, Barber＇s temperature model was used to prove the effectiveness for the railway superstructure. It is included the assessmentof improved modified asphalt mixes performed with coarse rubber from scrap tires, having 1.5 to 3 percent of crumb rubber （particlesize 0.2-4 mm） by weight of the total mix, as sub-ballast layer in railway and base layers on roads, recurring to the Superpave mixdesign compaction enhanced after computer simulations to evaluate real stresses derived from the rail traffic and climatic conditions.This article following the assessment of the average seasonal temperatures, involves the characterization of rubberized materials withattention to crumb rubber properties, designed with dry technology, to enhance the bitumen-rubber and binder-voids ratios. Indirecttensile strength and water sensitivity tests were applied for the evaluation of its mechanical properties including dynamic complexmodulus at elevated temperature to measure the amount of bitumen absorbed by the rubber. The rubberized mix-results obtained andthe comparison with a conventional HMA （hot mix asphalt） show that these dry rubber bituminous mixtures are particularly effective indamping vibrations. The purpose of using rubber modifiers in hot mix asphalt to obtain a stiffer-elastic sustainable material has beenachieved for the assessment of its behavior in sub-ballast/base layers.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
文摘The impact of temperature on the mechanical properties and thermal susceptibility of the railway bituminous sub-ballastlayer, has served as motivation to develop the advanced measurement of thermal cycles in this layer and, an evaluation of the averageseasonal temperatures interpolated by sinusoidal functions, of which characteristic parameters are determined. According to weathersituation, Barber＇s temperature model was used to prove the effectiveness for the railway superstructure. It is included the assessmentof improved modified asphalt mixes performed with coarse rubber from scrap tires, having 1.5 to 3 percent of crumb rubber （particlesize 0.2-4 mm） by weight of the total mix, as sub-ballast layer in railway and base layers on roads, recurring to the Superpave mixdesign compaction enhanced after computer simulations to evaluate real stresses derived from the rail traffic and climatic conditions.This article following the assessment of the average seasonal temperatures, involves the characterization of rubberized materials withattention to crumb rubber properties, designed with dry technology, to enhance the bitumen-rubber and binder-voids ratios. Indirecttensile strength and water sensitivity tests were applied for the evaluation of its mechanical properties including dynamic complexmodulus at elevated temperature to measure the amount of bitumen absorbed by the rubber. The rubberized mix-results obtained andthe comparison with a conventional HMA （hot mix asphalt） show that these dry rubber bituminous mixtures are particularly effective indamping vibrations. The purpose of using rubber modifiers in hot mix asphalt to obtain a stiffer-elastic sustainable material has beenachieved for the assessment of its behavior in sub-ballast/base layers.
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.
