Transfer of RAP binder and its influence on recycled HMA under three mixing techniques. Issue 5 (4th May 2023)

• Record Type: Journal Article
• Authors: Lei, Yong; Zhang, Chen; Ni, Xinyue; Gao, Junfeng; Chen, Guangfu; Guo, Yongcheng
• Is Part Of: Road materials and pavement design. Volume 24:Issue 5(2023)
• Page Start: 1273
• Page End: 1289
• Publication Date: 2023-05-04
• Subjects: Recycled HMA -- mixing technique -- FTIR -- compaction property -- high-temperature performance; Road materials -- Periodicals; Highway engineering -- Periodicals; Pavements -- Design and construction -- Periodicals; 625.805
• DOI: 10.1080/14680629.2022.2071754
• Languages: English
• ISSNs: 1468-0629

Abstract

Abstract : This study aims to identify the difference in the mobilisation degree of RAP asphalt binder under three mixing techniques and its influences on the performance of recycled hot-mix asphalt mixture (HMA). Glass beads were selected to replace parts of fresh coarse aggregates, and to analyze the transfer of RAP binder using Fourier Transformation Infrared (FTIR) spectroscope analysis. Superpave Gyratory Compactor (SGC) and Hamburg Wheel-Track Device (HWTD) were used to evaluate the compaction property and the high-temperature performance of recycled HMA. Results showed that the relative percentage of reclaimed asphalt recovered ( Rp ) varied with the mixing techniques. The workability of recycled HMA is related to the mixing technique. The softer fresh asphalt binder is more capable of facilitating the mineral aggregates to form a stable skeleton structure. In addition, the transfer of RAP binder in recycled HMA may be an important factor influencing the skeleton structure.