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Jayaneththi YH, Robert D, Giustozzi F. A critical review on leaching of contaminants from asphalt pavements. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 950:174967. [PMID: 39097010 DOI: 10.1016/j.scitotenv.2024.174967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2024] [Revised: 07/17/2024] [Accepted: 07/20/2024] [Indexed: 08/05/2024]
Abstract
Contaminant leaching from asphalt pavements poses a significant environmental concern, potentially damaging soil and groundwater quality. The growing interest in incorporating recycled materials in asphalt pavements has further raised concerns over the potential environmental hazards due to contaminant leaching. Consequently, this paper offers a comprehensive review of the literature over the past three decades structured into six sections: groundwater contamination via leaching, methodologies for evaluating leaching, analysis of contaminants, contaminants and leaching from road materials incorporating recycled waste, other factors affecting leaching of pollutants from asphalt pavements, and mathematical models to predict leaching from asphalt pavements. Despite the importance of addressing leaching issues, there is a lack of standardised leaching tests and guidelines specific to asphalt materials, limited attention to evaluating contaminants beyond heavy metals and PAHs in asphalt leachates, insufficient understanding of optimal instrument parameters for asphalt leachate analysis, and a scarcity of mathematical models to predict future leaching potential.
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Affiliation(s)
| | - Dilan Robert
- Civil and Infrastructure Engineering, RMIT University, 124 La Trobe St., Melbourne, VIC 3001, Australia
| | - Filippo Giustozzi
- Civil and Infrastructure Engineering, RMIT University, 124 La Trobe St., Melbourne, VIC 3001, Australia.
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Li H, Sun J, Hao G, Zhao Q, Hu Y, Zou X, Li Z. Effect of styrene butadiene styrene and desulfurized rubber powder on asphalt modification: Preparation, performance enhancement, mechanism analysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169077. [PMID: 38056672 DOI: 10.1016/j.scitotenv.2023.169077] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 11/09/2023] [Accepted: 12/01/2023] [Indexed: 12/08/2023]
Abstract
The aim of this study is to propose a desulfurized rubber powder / styrene butadiene styrene (DRP/SBS) composite modified asphalt technology by combining the advantages of DRP and SBS. This reduces the production cost of modified asphalt and improves the performance of asphalt. In this paper, orthogonal tests were used to optimize preparation process parameters of DRP/SBS composite modified asphalt. And the physicochemical properties, modification mechanism of composite modified asphalt had been thoroughly studied. Subsequently, the results showed that the optimum content of DRP and SBS modifiers are 25 % and 2 %, respectively. The suitable preparation process is to add SBS first, then DRP, while shearing at 5000 r/min for 50 min. In addition, DRP/SBS composite modified asphalt has better high-temperature performance, viscosity-temperature characteristics, aging resistance, and storage stability. Meanwhile, the storage stability of the composite modified asphalt was verified by fluorescence microscopy test. Through the Fourier transform infrared spectroscopy test, it was observed that the composite modified asphalt modification process is a compatible and stable modification of physical and chemical coexistence. Overall, the composite modification method achieves recycling of waste tires while improving pavement performance, thus promoting the sustainability of pavement.
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Affiliation(s)
- Haibin Li
- School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China; Road Engineering Research Center, Xi'an University of Science and Technology, Xi'an 710054, China.
| | - Jianmei Sun
- School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China; Road Engineering Research Center, Xi'an University of Science and Technology, Xi'an 710054, China.
| | - Gongxin Hao
- School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China; Road Engineering Research Center, Xi'an University of Science and Technology, Xi'an 710054, China.
| | - Qiongyang Zhao
- School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China; Road Engineering Research Center, Xi'an University of Science and Technology, Xi'an 710054, China.
| | - Yihong Hu
- School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China; Road Engineering Research Center, Xi'an University of Science and Technology, Xi'an 710054, China.
| | - Xiaolong Zou
- School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China; Road Engineering Research Center, Xi'an University of Science and Technology, Xi'an 710054, China.
| | - Zhigang Li
- School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China; Road Engineering Research Center, Xi'an University of Science and Technology, Xi'an 710054, China.
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