Recycling polyethylene terephthalate wastes as short fibers in Strain-Hardening Cementitious Composites (SHCC)
•This study explores the feasibility of recycling PET solid wastes as fibers in SHCC.•Recycled PET fiber is designed and treated following a micromechanical model of SHCC.•An effective treatment method is developed to improve the PET/matrix frictional bond.•The alkali resistance of PET fibers is imp...
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Veröffentlicht in: | Journal of hazardous materials 2018-09, Vol.357, p.40-52 |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | •This study explores the feasibility of recycling PET solid wastes as fibers in SHCC.•Recycled PET fiber is designed and treated following a micromechanical model of SHCC.•An effective treatment method is developed to improve the PET/matrix frictional bond.•The alkali resistance of PET fibers is improved by the same treatment method.•It offers a promising way to dispose hazardous PET wastes in construction industry.
As an important portion of the total plastic waste bulk but lack of reuse and recycling, the enormous amounts of polyethylene terephthalate (PET) solid wastes have led to serious environmental issues. This study explores the feasibility of recycling PET solid wastes as short fibers in Strain-Hardening Cementitious Composites (SHCCs), which exhibit strain-hardening and multiple cracking under tension, and therefore have clear advantages over conventional concrete for many construction applications. Based on micromechanical modeling, fiber dispersion and alkali resistance, the size of recycled PET fibers was first determined. Then the hydrophobic PET surface was treated with NaOH solution followed by a silane coupling agent to achieve the dual purpose of improving the fiber/matrix interfacial frictional bond (from 0.64 MPa to 0.80 MPa) and enhancing the alkali resistance for applications in alkaline cementitious environment. With surface treatment, recycling PET wastes as fibers in SHCCs is a promising approach to significantly reduce the material cost of SHCCs while disposing hazardous PET wastes in construction industry. |
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ISSN: | 0304-3894 1873-3336 |
DOI: | 10.1016/j.jhazmat.2018.05.046 |