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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 ...