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Materials 2018, 11(7), 1145; https://doi.org/10.3390/ma11071145

Fatigue Performance of Different Thickness Structure Combinations of Hot Mix Asphalt and Cement Emulsified Asphalt Mixtures

1
School of Materials Science and Engineering, Chang’an University, Xi’an 710061, China
2
Henan Provincial Communications Planning & Design Institute Co., Ltd., Zhengzhou 450052, China
3
Engineering Research Central of Pavement Materials, Ministry of Education of China, Chang’an University, Xi’an 710061, China
*
Authors to whom correspondence should be addressed.
Received: 15 June 2018 / Revised: 30 June 2018 / Accepted: 2 July 2018 / Published: 5 July 2018
(This article belongs to the Special Issue Environment-Friendly Construction Materials)
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Abstract

Cement emulsified asphalt mixture (CEAM) is widely used in asphalt pavement for its environmental virtues. However, a CEAM layer can influence fatigue performance of asphalt pavement because of higher air voids of CEAM in contrast to hot mix asphalt (HMA). Therefore, it is common to use HMA and CEAM structure combinations for improving the fatigue performance. In this work, three different thickness structure combinations of HMA (AC-10) and CEAM (AC-16) were designed, in which HMA and CEAM were used as top layer and bottom layer, respectively. The fatigue performance of the three combinations was studied. The fatigue equations of the combinations were established and the rational combination was recommended. The distributions of the internal voids in the combinations were studied with X-ray computed tomography (X-ray CT); and the correlation between the fatigue life and the void ratios were analyzed. Artificial neural network (ANN) was employed to predict the fatigue life of each combination. The results show that the fatigue life of the combinations is inversely proportional to the stress ratio level and environment temperature. The optimal combination is the structure with 40 mm HMA and 40 mm CEAM. The internal void ratio of CEAM is higher than that of HMA. A thinner HMA and thicker CEAM structure can result in higher void ratios and lower fatigue life of the combinations. The prediction results of ANN are similar to the experimental results. The obtained results can potentially guide the design of cement emulsified asphalt pavement structures. View Full-Text
Keywords: cement emulsified asphalt mixture; fatigue performance; thickness combinations; X-ray computed tomography; artificial neural network cement emulsified asphalt mixture; fatigue performance; thickness combinations; X-ray computed tomography; artificial neural network
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Wang, Z.; Cai, L.; Wang, X.; Xu, C.; Yang, B.; Xiao, J. Fatigue Performance of Different Thickness Structure Combinations of Hot Mix Asphalt and Cement Emulsified Asphalt Mixtures. Materials 2018, 11, 1145.

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