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- Title
Effect of Coarse Recycled Aggregate on Failure Strength for Asphalt Mixture Using Experimental and DEM Method.
- Authors
Yao, Yongsheng; Li, Jue; Liang, Chenghao; Hu, Xin
- Abstract
Coarse aggregate is the major part of asphalt mixture, and plays an essential role in mechanical performance of pavement structure. However, the use of poor-quality coarse recycled aggregate (CRA) reduces the strength and stability of the aggregate skeleton. It is a challenge to predict accurately the influence of CRA on the performance of asphalt mixture. In this study, both a uniaxial compression test and a direct tensile test were carried out to evaluate the failure strength of asphalt concrete with four CRA content. The discrete element method (DEM) was applied to simulate the specimen of asphalt concrete considering the distribution and properties of CRA. The results showed that temperature and loading rate have a significant influence on failure strength, especially when the CRA content was more than 20%. With the increase of CRA content, both cohesion force and internal friction angle were gradually weakened. The proposed model can be used to predict the failure strength of asphalt mixture, since both experimental and simulated results had a high consistency and repeatability. With the decrease of CRA strength, the nominal cohesion force of the specimen decreased, while the internal friction angle increased.
- Subjects
ASPHALT; ASPHALT concrete; DISCRETE element method; ASPHALT pavements; INTERNAL friction; TENSILE tests; MIXTURES
- Publication
Coatings (2079-6412), 2021, Vol 11, Issue 10, p1234
- ISSN
2079-6412
- Publication type
Article
- DOI
10.3390/coatings11101234