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This paper deals with an experimental and analytical study on the influence of recycled polyethylene terephthalate (R-PET) fibres as reinforcement of mortars. The mixtures were produced using Portland cement, fly ash, silica sand, superplasticizer and different amounts of R-PET fibres (0%, 1.0% and 2.0%). Dry density, total porosity and compressive tests were carried out. The results indicated that the incorporation of R-PET fibres significantly improves the post-cracking behaviour of mortars with a major improvement in mortar toughness. However, the addition of R-PET had no beneficial effect on the compressive strength and elastic modulus of the composite mixtures with 1% and 2%. A reduction of strength (up to 54%) and elastic modulus (up to 28%) was observed for composite mixtures due to increased porosity caused by fibre addition. Analytical models found in the literature for stress-strain behaviour were used along with curve fitting algorithms.

COMPRESSIVE STRESS-STRAIN BEHAVIOUR OF R-PET FIBRE REINFORCED MORTARS