Performance Evaluation of Asphalt Rubber Mixture with Additives.

Cheng Cheng,Liu Liu,Huang Huang,Ren Ren

doi:10.3390/ma12081200

Abstract

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.

Highlights

Crumb rubber, as a recycled material applied in asphalt, has gained more and more attention in recent years due to environmental benefits and property improvements in the virgin asphalt binder [1,2,3]
asphalt rubber Stone Matrix Asphalt (AR-Stone Matrix Asphalt (SMA)) with a nominal maximum size of 13.2 mm was selected in this study
According to the OAC of the traditional SMA, asphalt rubber content (ARC) 6.1% was selected as the initial value

Summary

Introduction

As a recycled material applied in asphalt, has gained more and more attention in recent years due to environmental benefits and property improvements in the virgin asphalt binder [1,2,3]. The blend of virgin asphalt binder and crumb rubber, has excellent physical properties [4]. There are generally many benefits using asphalt rubber mixtures: excellent resistance to cracking, improved durability, less road maintenance, lower road noise, etc. Various types of asphalt pavements have been used to study noise over the years, including. Permeable European Mixture (PEM), Stone Matrix Asphalt (SMA), Asphalt Rubber Open-Graded. The findings showed that the noise of AR-ACFC was lowest for all years and had a minimum increase in service years [6].

Objectives

Results

Conclusion