01697356

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Asphalt rubber (AR) mixture has received growing attention in the past years because of its various advantages, such as potential energy recovery, excellent durability and lower tyre-road noise. However, its high construction temperature would result in increased energy consumption and emission during construction. As one of the solutions, warm mix asphalt (WMA) technologies can reduce the construction temperature of AR mixture with the assistance of various WMA additives. In this study, a life cycle assessment (LCA) framework incorporated with uncertainty analysis was built to identify the energy-saving role of WMA technologies in AR pavement, and quantify the life cycle energy consumption of warm AR pavements built with three typical warm additives: Evotherm™-DAT, Sasobit® and Aspha-Min®. The uncertainty parameters were quantified and propagated through the Monte Carlo simulation. The results of this study showed a visible energy reduction due to usage of the WMA technologies during the material production phase. However, when the usage phase contribution was considered, such energy reduction benefits during the material production phase became insignificant, signifying the importance of pavement performance. In addition, it was expected that by incorporating uncertainty analysis into LCA, more reliable information could be provided for decision-making compared with the deterministic assessment results.

This paper was sponsored by TRB committee AFD60 Standing Committee on Design and Rehabilitation of Asphalt Pavements.

19-03712

English

9p

2019

Transportation Research Board 98th Annual Meeting

Digital/other

Figures; References; Tables

Asphalt pavements; Asphalt rubber; Life cycle analysis; Uncertainty; Warm mix paving mixtures

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2019 Paper #19-03712

TRIS, TRB, ATRI

Dec 7 2018 9:25AM