The degradation of synthetic fibres derived from post-consumer wastes and used in fibre-reinforced cement 21 mortars was studied. Polyethylene terephthalate (PET) and high-density polyethylene post-consumer bottles were 22 31 countries should be considered. The use of these wastes would, on the one hand, improve the properties of construction 32 materials, and on the other, enable proper management of waste that could otherwise eventually pollute the environment. 33 34 35 reinforcement 36 37 38

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... 39 2 235 monofilament PET fibres present similar degradation in all cases. 237 The preliminary results of this study show overall good behaviour of the studied fibres. This behaviour generally 238 improves when pozzolans are used. Considering that fibres and pozzolans are obtained from wastes and therefore have low 239 economic and environmental costs, the possibility of using these materials in developing countries should be considered. 240 7