Asphalt binder is generally identified as a brittle material at low service temperature or under high-speed load, and the brittleness becomes serious after weathering aging. Improving the toughness of asphalt binder through adding high-content of crumb tire rubber is an efficient method to solve this problem. Devulcanized rubber modified asphalt binder (DRMA) with different contents (15–40%) of devulcanized rubber (DR) were prepared and their conventional physical properties, toughness, rheological properties, and microstructure were characterized by DSR, dynamic mechanical thermal analysis, sol–gel analysis, gel permeation chromatography and optical microscopy. It was found that DRMA with 35% DR content still had a good processing property. According to the results of Charpy impact and stretching tests, the toughness of DRMA measured under dynamic or fast-speed loads dramatically increased with an increase of DR content. Remarkably, the brittle-tough transition of DRMA with approximately 25% DR content was identified. The toughening effect of DR on asphalt binder was explained in terms of the decreased temperature stress, the improved speed of stress dissipation, and the increased fracture energy of DRMA. These findings provided a perspective on the viscoelastic characteristics of DRMA under a dynamic load by simple adaptation of standardized tests dedicated for polymers.
Authors
- Xiaoxiao Yu,
- Weihong Yang,
- Lu Zhang,
- dr inż. Krzysztof Formela link open in new tab ,
- Shifeng Wang
Additional information
- DOI
- Digital Object Identifier link open in new tab 10.1016/j.conbuildmat.2022.128650
- Category
- Publikacja w czasopiśmie
- Type
- artykuły w czasopismach
- Language
- angielski
- Publication year
- 2022
