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A New Sustainable PPT Coating Based on Recycled PET to Improve the Durability of Hydraulic Concrete
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This study characterized the abundance and types of microplastics in atmospheric fallout in a remote location far from major urban centers. Plastic fibers and fragments were detected at significant deposition rates, confirming that atmospheric transport disperses microplastics to pristine environments globally.
A new, sustainable polypropylene terephthalate (PPT) coating was synthesized from recycled polyethylene terephthalate (PET) and applied onto a hydraulic concrete substrate to improve its durability. For the first step, PET bottle wastes were ground and depolymerized by glycolysis using propylene glycol (PG) in a vessel-type reactor (20-180 °C) to synthesize bis(2-hydroxypropyl)-terephthalate (BHPT), which was applied as a coating to one to three layers of hydraulic concrete substrate using the brushing technique and polymerized (150 °C for 15 h) to obtain PPT. PET, BHPT, and PPT were characterized by FT-IR, PET, and PPT using TGA, and the PPT coatings by SEM (thickness), ASTM-D3359-17 (adhesion), and water contact angle (wettability). The durability of hydraulic concrete coated with PPT was studied using resist chloride ion penetration (ASTM-C1202-17), carbonation depth at 28 days (RILEM-CPC-18), and the absorption water ratio (ASTM-C1585-20). The results demonstrated that the BHPT and PPT were synthetized (FT-IR), and PPT had a similar thermal behavior to PET (TGA); the PPT coatings had good adhesion to the substrate, with thicknesses of micrometric units. PPT coatings presented hydrophilic hydrophilic behavior like PET coatings, and the durability of hydraulic concrete coated with PPT (2-3 layers) improved (migration of chloride ions decreased, carbonation depth was negligible, and the absorption water ratio decreased).
More Papers Like This
A New Sustainable PPT Coating Based on Recycled PET to Improve the Durability of Hydraulic Concrete
AI summary Read the abstract
Researchers synthesized a new sustainable polypropylene terephthalate (PPT) coating derived from recycled PET and evaluated its performance in improving the durability of hydraulic concrete exposed to water and aggressive environments. The coating demonstrated enhanced protection against water penetration and chemical attack, offering a circular economy approach to infrastructure protection.
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Researchers tested waste PET plastic as a partial aggregate substitute in concrete, finding that up to 10% PET incorporation maintains acceptable compressive strength per ASTM standards, offering a potential pathway to divert non-biodegradable plastic waste into low-load-bearing construction materials.
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Researchers tested concrete made with recycled polyethylene and PET plastic aggregates substituted for natural sand and gravel, finding that while plastic additions reduced compressive strength and increased water permeability, they improved impact resistance and chloride resistance, with PET concrete showing no microplastic leaching.
Innovative Sustainable Concrete: Fresh and Hardened Properties Incorporating Plastic Waste
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This study investigated the effects of incorporating plastic waste into concrete on mechanical and durability properties, addressing the hydrophobic nature and poor interfacial adhesion of plastic as a challenge within circular economy frameworks for construction material sustainability.
Insight into the polyethylene terephthalate powder on mechanical performance and sorptivity analysis of concrete
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Researchers turned recycled plastic bottle waste (PET) into nano-sized powder and mixed it into concrete at different amounts, replacing some cement. Lab testing found that replacing about 3% of cement with this PET powder made concrete stronger and less absorbent of water, but higher amounts or larger particle sizes weakened the concrete.
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