Performance Evaluation of Asphalt Rubber Mixture with Additives

Crumb rubber, as a recycled material used in asphalt mixture, has gained more attention in recent years due to environmental benefits and the advantages of its pavement, such as excellent resistance to cracking, improved durability, less road maintenance, lower road noise, etc. However, the high-tem...

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Bibliographic Details
Published in:Materials 2019-04, Vol.12 (8), p.1200
Main Authors: Cheng, Xianpeng, Liu, Yamin, Ren, Wanyan, Huang, Ke
Format: Article
Language:English
Subjects:
Additives
Aggregates
Asphalt mixes
Asphalt pavements
Butadiene
Crack propagation
Crack sensitivity
Durability
Fatigue cracking
Fatigue failure
Fatigue life
Four point bending
Fracture mechanics
Friction
Laboratories
Noise
Performance enhancement
Performance evaluation
Physical properties
Recycled materials
Road maintenance
Rubber
Stone mastic asphalt
Styrenes
Thermal stability
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Summary:Crumb rubber, as a recycled material used in asphalt mixture, has gained more attention in recent years due to environmental benefits and the advantages of its pavement, such as excellent resistance to cracking, improved durability, less road maintenance, lower road noise, etc. However, the high-temperature performance of mixture with crumb rubber does not perform well. In order to improve the performance, this paper examined the effect of additives on the laboratory performance of asphalt rubber Stone Matrix Asphalt (AR-SMA) with additives. Three groups of AR-SMA: no additives, Styrene-Butadiene-Styrene (SBS) and Granular Polymer Durable additive (GPDa) were included, with no additives as a control group. Each group was investigated at three asphalt rubber content (ARC): 6.4%, 6.9%, 7.4% with regard to high-temperature and fatigue properties. The results show that with increasing ARC, the high-temperature performance of mixture without additive decreases, and the high-temperature performance increases first and then decreases for SBS and GPDa. Moreover, the rutting resistance of AR-SMA with GPDa at 6.9% ARC performs best. Under the condition of mixtures with appropriate ARC, AR-SMA with GPDa has higher fatigue life and sensitivity to fatigue cracking than the control group. Simultaneously, the fatigue performance of AR-SMA with GPDa is not as significant as that without additive with increasing ARC. In a word, GPDa is a good choice to improve the performance of AR-SMA. However, it should be noted that optimal asphalt content of AR-SMA mixtures with GPDa is higher than that of traditional mixtures.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12081200