Foamed Warm Mix Asphalt Mix Design using Response Surface Method

Articles in Press

Document Type : Original Article

Authors

1 Department of Civil and Environmental Engineering, Tarbiat Modares University, Tehran

2 Tarbiat modares University

Abstract

Application of Warm Mix Asphalt (WMA) together with presence of Reclaimed Asphalt Pavement (RAP) is increased because of their environmental and economic benefits. However, lack of an accepted approach to obtain the optimum mix design of WMA reported as one of main challenges in this way. Presence of RAP particles in WMA would increase this challeng with respect to the interaction of virgin asphalt binder and RAP aged binder. So, the interaction between different testing variables (i.e. RAP content, Asphalt binder content and mixing temperature) was considered to present the mix design. The foam bitumen technology was applied in this work to fabricat the WMA mixes containing various RAP contents (30%, 50% and 70%). In addition, the optimization process was progressed using The Response Surface Method (RSM) in which the desirability index was employed to obtain the optimum mix design. Furthermore, the Image Proccessing method was carried out to investigate the stripping intensity of various mixes exposed to boiling Texas test. The results of this study showed that Foamed WMA mixes are more prone to moisture distress compared with conventional Hot Mix Asphalt. Moreover, the beneficial impact of RAP particles on the moisture resistance of Foamed WMA mixes is evident. Increase of RAP content in this mix led to decrease its susceptibility to moisture.

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Journal of Transportation Research

Articles in Press, Accepted Manuscript
Available Online from 22 June 2020

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