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Short-term aging performance of activated rubber powder/SBScomposite modified asphalt(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2021年5期
Page:
23-33
Research Field:
道路工程
Publishing date:

Info

Title:
Short-term aging performance of activated rubber powder/SBScomposite modified asphalt
Author(s):
YANG Yongqiang1; 2;  KANG Bingduo2;  GUO Haidong1;  MA Yuan1; KUANG Dongliang2;  CHEN Huaxin2
(1. Qinghai Huangyuan Highway Section, Xining 812100, Qinghai, China; 2. School ofMaterials Science and Engineering， Changan University, Xian 710061, Shaanxi, China)
Keywords:
road engineering;  asphalt pavement;  desulfurization rubber powder;  rubber powder/SBS composite modified asphalt;  shortterm aging;  road performance
PACS:
-
DOI:
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Abstract:
In order to explore the effect of SBS composite modification on the shortterm aging performance of activated rubber powder modified asphalt, the shortterm aging behavior of composite modified asphalt was simulated by asphalt film heating test (TFOT), and the hightemperature performance, lowtemperature performance and workability of composite modified asphalt before and after aging were evaluated by softening point, penetration, elastic recovery, viscosity and force ductility tests. The softening point was taken as the main reference index, and the performance stability of composite modified asphalt under different aging conditions was studied. The correlation was analyzed by scanning electron microscope (SEM) and volume microscope between the micro morphology and shortterm aging properties of activated rubber powder/SBS composite modified asphalt. The results show that after shortterm aging, the changes of high temperature performance, low temperature performance and workability of activated rubber powder/SBS composite modified asphalt are reduced, and the addition of SBS improves the aging resistance of activated rubber powder modified asphalt. The softening point of activated rubber powder/SBS composite modified asphalt is less affected by the changes of aging time and aging temperature, and the composite modified asphalt has good stability under different shortterm aging conditions. The network structure formed by SBS and asphalt effectively slow down the secondary degradation of rubber powder during shortterm aging of activated rubber powder/SBS composite modification. The addition of SBS in the microscope show that the activated rubber powder /SBS composite modified asphalt maintain a relatively multiphase structure in the short term aging process. It is conducive to the rubber powder and SBS degradation products react with asphalt to supplement the components in the asphalt and play an antiaging role. 5 tabs, 14 figs, 30 refs.

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Last Update: 2021-09-30