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AGING OF WASTE PET FIBRES USED AS MICRO-REINFORCEMENT IN CEMENTITIOUS MATRICES
Abstract
The increasing amount of poly(ethylene terephthalate) (PET) waste is a worldwide problem which has induced requirements for its recycling and reusing. PET fibres have been used as a dispersed micro-reinforcement in a cementitious matrix. The microreinforcement in the fibre reinforced concrete absorbs tensile strain and prevents formation of microcracks originating from concrete shrinkage. The present work has been aimed at studying the effects of aging PET fibres by alkali hydrolysis and temperature cycles on the compressive and flexural strength of the PET-cement composite. Using differential scanning calorimetry, infrared spectroscopy and water vapour sorption, chemical changes of PET fibres after their degradation have been characterized together with their effect on mechanical properties of the fibres and the resulting PET-cement composite. It has been found that the flexural strength of the composite has been increased by alkali hydrolysis of PET fibres in sodium hydroxide.
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References2
Silva T, Betioli A.M., Gleize P.J.P., Roman H.R., Gomez L. A., Ribeiro J.L.D. Degradation of recycled PET fibers in Portland cement-based materials, Cem. Concr. Res., 35 pp 1741-1746, 2005.
Ochi T., Okubo S., Fukui K. Development of recycled PET fiber and its application as concrete-reinforced fiber, Cem. Concr. Res. 29, pp 448-455, 2007.
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