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Dynamic leaching assessment of recycled polyurethane-coated tire rubber for sustainable engineering applications
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Researchers evaluated the leaching behavior of polyurethane-coated recycled tire rubber mixed into soil, finding that the polymer coating reduced zinc leaching by 99.4% compared to uncoated rubber, suggesting this material is a safe and viable option for sustainable infrastructure applications such as vibration damping and rubberized concrete.
Assessing the material ramifications of waste tire rubber stands as a pivotal endeavor for its practical utility. Dynamic leaching analysis emerges as indispensable in delineating its potentialities within sustainable engineering domains. Waste materials stemming from tire recycling industries, notably polyurethane-coated rubber (PUcR), may exhibit promising viability owing to attenuated leaching, thus fostering the circular economy paradigm. Towards this end, up-flow column percolation leaching tests were conducted on recycled rubber-soil mixture (RSM) alongside PU-coated rubber-soil mixture (PUcRSM). Analysis through Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES) unveiled the leaching dynamics of assorted metals in RSM and PUcRSM, notably showcasing markedly diminished cumulative zinc content (by 99.4 %) in PUcRSM, coupled with mitigated electrical conductivity, redox potential, and eluate pH. Leveraging HYDRUS-1D for analytical modeling predicated on the advection–dispersion equation further underscored these insights. These findings suggest that waste PUcR presents itself as a viable option, distinguished by its diminished leachability, suitable for a wide array of applications. These applications include vibration damping in infrastructure, tunnel linings, asphalt roads, rubberized concrete, and lightweight backfill materials for bridges and retaining walls, among others. This initiative will contribute to recycling a substantial quantity of over 1 billion used tires produced annually, ultimately supporting the circular economy ethos through assured and adaptable repurposing of waste from tire rubber recycling industries.
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Researchers found that recycled car tire microparticles leach hazardous chemicals — including phthalates, benzene, and benzothiazole — into water, with leaching rates influenced by pH, temperature, particle size, and incubation time, raising environmental concerns about using tire waste in civil engineering applications.
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This review examines current practices for utilizing waste rubber from tires and other sources in infrastructure and geoenvironmental engineering applications, covering both technical performance and sustainability considerations. The high resistance of vulcanized rubber to degradation makes developing novel bulk utilization strategies urgent for reducing waste rubber accumulation.
Analysis of Tyre Tread for Metal Tracers with Applications in Environmental Monitoring
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Researchers analyzed tyre tread rubber from passenger car and heavy goods vehicle tyres for 25 elements by ICP-MS to develop a multielement fingerprint for tyre wear as an environmental tracer, finding 19 of the 25 elements detectable and identifying limitations of zinc as a single-element proxy. Thermogravimetric analysis was also used to estimate the inert filler fraction, and compositional differences between tread and sidewall were documented.
Heavy metal release from two typical tire microplastics under different simulated environments and bioavailability assessment in China
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Researchers measured heavy metal (Zn, As, Cd) release from tire repair polished debris and recycled tire crumb rubber under simulated acid rain and seawater conditions, finding significant leaching — especially of zinc — with notable differences between tire brands and regional samples from northern and southern China.
A new look at rubber recycling and recreational surfaces: The inorganic and OPE chemistry of vulcanised elastomers used in playgrounds and sports facilities
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Researchers analyzed the chemical composition of recycled rubber crumb used in playgrounds and sports fields, measuring trace elements and organophosphate esters. They found high zinc concentrations in used tire crumb and identified numerous flame retardant and plasticizer chemicals across all sample types. The study raises concerns about chemical exposure from recreational rubber surfaces and calls for closer investigation of how these compounds weather and leach over time.
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