The Effect of Asphalt Binder Aging on Fatigue Performance of Evotherm WMA

Yong Chun Qin; Sui Yuan Wang; Wei Zeng; Xiao Pei Shi; Jian Xu; Song Chang Huang

doi:10.4028/www.scientific.net/AMR.535-537.1686

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 535-537The Effect of Asphalt Binder Aging on Fatigue...

The Effect of Asphalt Binder Aging on Fatigue Performance of Evotherm WMA

Abstract:

One of the main benefits advertised with the use of warm mix asphalt (WMA) is the decreasing aging of the asphalt binder resulting from the lower production temperature compared to conventional hot mix asphalt (HMA). Some tests were performed to determine the asphalt binder aging properties from WMA and HMA. Asphalt binders were recovered by extraction and distillation from asphalt mixtures premixed at different temperatures (140°C, 160°C, 180°C for HMA, 100°C and 120°C for WMA) in the mixing plant. Penetration@25°C, softening point (R&B) and rotational Brookfield viscosity tests were carried out. Results show that the aging of asphalt binder increases as the mixing temperature is elevated, and remarkably accelerates at the temperatures higher than 150°C. Warm mix asphalt (for example, mixing temperature at 100°Cor 120°C) can greatly reduce the aging of asphalt. Aging of the asphalt binder is one of the factors that would affect the mixture’s fatigue life. Four-point beam fatigue test samples were mixed and compacted at 140°C for HMA and 120°C for WMA, and fatigue tests with a frequency of 10 Hz and three constant strain levels (150 micro-strain, 300 micro-strain, 450 micro-strain, respectively) were performed. Results show that WMA’s fatigue life was higher than the control HMA, which indicates that it may reduce aging of asphalt binder and improve fatigue performance of asphalt mixture at lower production temperatures.

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Periodical:

Advanced Materials Research (Volumes 535-537)

Pages:

1686-1692

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.535-537.1686

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Online since:

June 2012

Authors:

Yong Chun Qin, Sui Yuan Wang, Wei Zeng, Xiao Pei Shi, Jian Xu, Song Chang Huang

Keywords:

Aging of Asphalt, Extraction and Distillation, Four-Point Beam Fatigue, Hot Mix Asphalt, Warm Mix Asphalt (WMA)

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