Low Temperature Performance Evaluation and Mechanism Analysis of Wood Tar-Based Rejuvenated Asphalt

被引：0
|
作者：
Liu C. [1 ]
Jiang K. [2 ]
Wu C. [3 ]
Liu K. [1 ]
机构：
[1] Institute of Southern Green Road, Central South University of Forestry and Technology, Changsha
[2] Hunan Communications Research Institute Co., Ltd., Changsha
[3] Hunan Provincial Engineering Research Center for Construction Solid Wastes Recycling, Changsha
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2021年 / 24卷 / 06期
关键词：
Biomass material; Component analysis; Infrared spectrum; Low‑temperature cracking resistance; Wood tar‑based rejuvenated asphalt;
D O I：
10.3969/j.issn.1007-9629.2021.06.018
中图分类号：
学科分类号：
摘要：
To explore the low‑temperature cracking resistance of wood tar‑based rejuvenated asphalt, the low‑temperature cracking resistance and its mechanism of base asphalt, wood tar‑based rejuvenated asphalt and RA‑102 rejuvenated asphalt were tested and compared. The correlation between performance indexes and low‑temperature cracking resistance of asphalt was evaluated by grey relational degree analysis. Research results show that the addition of rejuvenator can effectively restore the low‑temperature deformation ability and stress relaxation ability of the aged asphalt, and resist the adverse effects of low temperature on the aged asphalt to a large extent, but it is difficult to completely recover to the level of original asphalt. Wood tar‑based rejuvenator can significantly decrease the brittleness and crystallinity of the aged asphalt, inhibit the crystallization of asphalt at low temperature and improve the flexibility of the molecular chain, thus improving the stress relaxation effect and increasing the ductility. Wood tar‑based rejuvenator can blend the components of aged asphalt and adjust its colloidal structure, effectively improve the concentration of asphalt relative molecular mass, weaken the intermolecular force, and reduce the relative content of macromolecular substances. The correlation degree between various performance parameters of rejuvenated asphalt and its low‑temperature performance is quite different. In the future, a multi‑parameter comprehensive evaluation system and index between the type and performance of rejuvenator, the ratio of rejuvenated asphalt and the recovery of low‑temperature performance of rejuvenated asphalt should be established to realize the directional control of low‑temperature crack resistance of different rejuvenated asphalt. © 2021, Editorial Department of Journal of Building Materials. All right reserved.
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页码：1255 / 1264
页数：9
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