| Title: | Environmental Impact on VOCs Emission of a Recycled Asphalt Mixture with a High Percentage of RAP |
| Author(s): | Wei M; Wu S; Zhu L; Li N; Yang C; |
| Address: | "School of Transportation, Wuhan University of Technology, Wuhan 430070, China. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China. Technology Center of Dongfeng Automobile Group Co. Ltd., Wuhan 430056, China" |
| ISSN/ISBN: | 1996-1944 (Print) 1996-1944 (Electronic) 1996-1944 (Linking) |
| Abstract: | "Recycling of reclaimed asphalt pavement (RAP) has gradually emerged as a hot topic in the current research of building materials. Manufacturing the recycled asphalt mixture with a high RAP content still remains a major challenge due to the problem of inferior water damage resistance and fatigue cracking resistance. The aim of this study is to evaluate the servicing performance of recycled asphalt mixture with high percentage of RAP and assess its environmental impact on volatile organic compounds (VOCs) emission. To further explore the intrinsic factor on the performance of a recycled asphalt mixture, the mixed asphalt binder with a different content of extracted RAP binder was firstly investigated. The results show that the larger the content of RAP binder, the lower the mechanical indexes and VOCs emission. There exists an internal relationship between the chemical composition and VOCs release behavior with the variation of the recycled asphalt binder content. Based on the results of mixed recycled asphalt binder, the road servicing performance of a rather high utilization of RAP (i.e., 50%, 60%, and 70%) was assessed. It was found that the reuse of RAP aggregates has little influence on the volume performance of recycled asphalt mixture, and servicing performances still meet the construction requirements in spite of a descending trend. Moreover, a significant reduction effect on VOCs emission was found in the mixing stage of recycled asphalt mixture, indicating that the VOCs emission can be decreased by 94.82% when the content of RAP aggregates increases to 70%. The recycling of RAP with a high content contributes to the sustainable development of road engineering and the construction of green pavements" |
| Keywords: | VOCs emission high content RAP recycled asphalt mixture servicing performance; |
| Notes: | "PubMed-not-MEDLINEWei, Minghua Wu, Shaopeng Zhu, Lei Li, Na Yang, Chao eng 71961137010/National Natural Science Foundation of China/ 51778515/National Natural Science Foundation of China/ 2017YFE0111600/Ministry of Science and Technology National Key R&D Plan/ No. SYSJJ2019-20/State Key Laboratory of Silicate Materials for Architectures/ 2019AEE023/Technological Innovation Major Project of Hubei Province/ Switzerland 2021/03/07 Materials (Basel). 2021 Feb 17; 14(4):947. doi: 10.3390/ma14040947" |
