Warm asphalt rubber: A sustainable way for waste tire rubber recycling
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Warm asphalt rubber: A sustainable way for waste tire rubber recycling YU Hua-yang(于华洋)1, 2, DENG Guan-sen(邓冠森)1, WANG Duan-yi(王端宜)1, ZHANG Ze-yu(张泽宇)3, OESER M3 1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China; 2. State Key Laboratory of Subtropical Building Science, Guangzhou 510641, China; 3. Institute of Highway Engineering, RWTH Aachen University, Aachen 52074, Germany © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: Recycling end-of-life tire rubber as asphalt modifier is known as a sustainable paving technology with merits including enhanced pavement durability, waste tire consumption and noise reduction. However, the criticisms on the high construction emissions of asphalt rubber (AR) have limited its application. Warm mix asphalt (WMA) effectively reduces the mixing and compaction temperatures of conventional hot mix asphalt mixtures. The combination of AR and WMA, called warm asphalt rubber (WAR), is a promising paving material which achieves pavement sustainability from principles to practices. Many studies have demonstrated that WMA technologies work effectively with AR pavement in different ways, alleviating the concerns of potential higher emissions of AR by decreasing mixing and paving temperatures. A comprehensive literature review about WAR brings a better understanding of this promising paving technology. The findings of 165 publications were summarized in this review. It summarized the recent developments of WAR in various aspects, including rheological properties, mix design, mixture mechanical performance, field application, construction emission, and asphalt-rubber-WMA additive interaction. It is expected that this review is able to provide extensive information to explore further research development and application of WAR. Key words: asphalt rubber; warm mix asphalt; workability; interaction; performance Cite this article as: YU Hua-yang, DENG Guan-sen, WANG Duan-yi, ZHANG Ze-yu, OESER M. Warm asphalt rubber: A sustainable way for waste tire rubber recycling [J]. Journal of Central South University, 2020, 27(): . DOI: https://doi.org/10.1007/s11771-020-4467-y.
1 Introduction Asphalt concrete (AC), the most frequently used paving material for highway construction, is conventionally prepared by blending aggregates, asphalt binder, and fillers together in elevated temperature with tremendous heat energy [1, 2]. While offering indispensable contribution to society, asphalt pavement significantly influences environment in all periods including construction,
operation, and maintenance [3]. Since nowadays sustainability has attracted a lot of interest worldwide, the construction of infrastructures, including asphalt pavement, are suggested to follow reclaim, recycle and reduce (3R) principles [4]. Generally, reclamation in pavement engineering refers to the process of reclaiming road materials from loss or from a less useful condition; recycling involves processing waste material
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