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Reduced zinc leaching from scrap tire during pavement applications
Xuesong Liu1, Jianmin Wang1, Ahmed Gheni1
1Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65409, United States.
Waste Management (New York, N.Y.)
|December 12, 2018
Summary
Asphalt treatment significantly reduces zinc leaching from scrap tire particles used in pavements. This method, along with larger particle size and higher pH, improves environmental safety by minimizing metal release.
Area of Science:
- Environmental Science
- Materials Science
- Geotechnical Engineering
Background:
- Scrap tires pose environmental challenges due to disposal limitations.
- Tire-derived materials in asphalt applications raise concerns about zinc leaching.
- Zinc content in tires necessitates investigation into potential environmental impacts.
Purpose of the Study:
- To investigate zinc leaching from tire particles in asphalt pavement applications.
- To examine the influence of tire particle size and pH on zinc leaching.
- To assess the environmental performance of asphalt-treated tire particles.
Main Methods:
- Investigated zinc leaching from tire particles incorporated into asphalt.
- Examined the effects of varying tire particle size and pH.
- Quantified zinc leaching using a speciation-based modeling approach.
- Evaluated leaching using simulated acid rain.
Main Results:
- Asphalt treatment significantly reduced zinc leaching from tire particles.
- Increased tire particle size and pH further decreased zinc leaching.
- A speciation-based model was developed to predict zinc leaching.
- Asphalt treatment physically blocked tire surfaces, reducing metal release.
- Leaching of zinc and toxic elements from untreated tires was not significant compared to drinking water standards.
Conclusions:
- Asphalt treatment is an effective strategy to mitigate zinc leaching from tire-derived materials in pavements.
- Optimizing particle size and pH can further enhance the environmental safety of tire recycling in infrastructure.
- Recycling tires in asphalt applications offers an environmentally sound solution for waste management.
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