Performance of asphalt mixture with combine warm mix additives

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Performance of asphalt mixture with combine warm mix additives

 

Author: Wu, Tianyu
Title: Performance of asphalt mixture with combine warm mix additives
Degree: M.Sc.
Year: 2015
Subject: Asphalt concrete.
Pavements, Asphalt concrete -- Materials.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Civil and Environmental Engineering
Pages: ix, 48 pages : illustrations (some color)
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2818315
URI: http://theses.lib.polyu.edu.hk/handle/200/8062
Abstract: Warm mix asphalt is a sustainable paving technology with lower energy cost and better working environment during the pavement construction process. So far, properties and performance of non-foaming warm mix asphalt (WMA) additives have been well evaluated, but whether these additives works well for asphalt rubber (AR) need further investigation. The objective of this study is to assess the effects of different WMA additives (Evotherm-DAT; Sasobit and the combination of Evotherm and Sasobit) on asphalt rubber binders and mixtures. The workability of warm AR binders was evaluated by the rotational viscosity value and the compacting temperature of warm AR mixture is determined by the final air void content. It was found that all the three tested WMA additives are beneficial to improve the workability of AR by decreasing the viscosity value. By comparison, Saobit is the most effective in reducing the compaction temperature, followed by the combined additive and Evotherm. Meanwhile, among all warm AR mixtures, AR mixtures with Sasobit had the highest Marshal Stability, while those with Evothem-DAT had the lowest one. With respect to the air void content, the Evotherm mixture had the lowest air void content at the same compaction temperature, indicating the best workability. Based on the test results, it is believed that with the aid of WMA additives, the mixing temperatures of AR mixtures can be reduced from 170°C to 150°C. The temperature reduction performance of Evotherm seems to be better than Sasobit, but the Sasobit mixture showed better mechinical performance.

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