A Comparative Study for Creep and Recovery Behavior Characterization of Modified Bitumens Using the MSCR Test
Source abstract
Abstract
In recent decades, the application of modified bitumens has experienced tremendous growth. However, due to the varying modification mechanism of different modifiers, the creep and recovery properties of modified bitumen have not been comprehensively understood. This study aims to evaluate the creep and recovery properties of several representative modified bitumens using the multi-stress creep recovery (MSCR) test. The MSCR test can highlight the unique delayed elasticity of modified bitumen and it uses a high stress level, which is more comparable to the field. In particular, this test also aims to identify the effects of different aging conditions. To do so, a total of 15 bitumens, including 7 elastomeric-modified bitumens, 5 non-elastomeric-modified bitumens, and 3 plain bitumens, were prepared and examined. Furthermore, 10 different aging conditions were considered. The results suggest that the generation mechanism of elasticity varies for different modified bitumens. There are two types of elasticities, which are energy elasticity and entropy elasticity, and their differences need more attention in the road bitumen material community. Aging changes the percentages of contributions from energy elasticity and entropy elasticity to the bitumen’s overall recovery performance. The increase in “bad” energy elasticity may compensate for part of the “good” entropy elasticity loss, but overall, the bitumen’s recovery rate is decreasing and the ratio of energy elasticity is increasing, which might hinder the bitumen’s road performance.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Asphalt Pavement Performance Evaluation · Infrastructure Maintenance and Monitoring · Geotechnical Engineering and Underground Structures
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Foshan Road and Bridge Supervision Station Co., Ltd., Foshan 528041, China
Foshan Transportation Science and Technology Co., Ltd., Foshan 528041, China
School of Transportation, Civil Engineering and Architecture, Foshan University, Foshan 528225, China
School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410004, China
Highway Engineering Key Laboratory of Sichuan Province, Chengdu 610031, China
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Funding
National key R&D program of China · Hong Kong scholars program · National Natural Science Foundation of China · Sichuan Youth Science and Technology Innovation Research Team
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