Influence of RAP content on durability of warm mix recycled asphalt mixture(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年05期
- Page:
- 25-31
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Influence of RAP content on durability of warm mix recycled asphalt mixture
- Author(s):
- LI Da1; 2
- Keywords:
- road engineering; recycled asphalt pavement; RAP content; moisture induced sensitivity test; semicircle bending test; simple performance test; durability
- PACS:
- -
- DOI:
- -
- Abstract:
- To study the effect of old material content on durability of warmmix recycled asphalt mixture, the water resistance performance of mixtures were studied by freezethaw splitting test and moistureinduced sensitivity test (MIST), the anticracking performance of asphalt mixtures were studied by semicircular bending test，the change trend of the dynamic modulus of the mixture.were studied by simple performance tester (SPT). The results show that, with an increase in recycled asphalt product (RAP) content, the dynamic modulus ratio of the asphalt mixture increases gradually after water treatment, the influence attenuation of water to the dynamic modulus is relatively low. The dissipated creep strain energy (DCSEf) of the warmmixed asphalt first increases and then decreases. an optimum RAP content in warm mix recycled asphalt mixture. There is an increase in RAP reduces the anticracking ability of the asphalt mixture to a certain extent and causes the mixture to develop brittleness. When the RAP content reaches a certain level, the cracking resistance performance of the recycled asphalt is no longer reduced. Under the same conditions, the greater the RAP content, the greater the dynamic modulus of the regenerated mixture, the greater the stiffness, and the more brittle the mixture. With an increase in test temperature, the dynamic modulus of the warmmixed asphalt shows more viscoelastic characteristics. In a comparison between hotmixed and warmmixed asphalts with the same RAP content, the resistance to deformation, crack resistance, and dynamic modulus of the hot recycled asphalt mixture were higher than those under similar conditions. Under the condition of hot regeneration, The amount of old asphalt that RAP material is more than that of warm mix, under conditions of thermal regeneration. The higher density of the mixture and the change in volume characteristics lead to differences in performance. 4 tabs, 4 figs, 23 refs.
Last Update: 2018-10-23