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Appl. Sci. 2022, 12, 2867 17 of 20 may be because, although the fibres reduce the porosity of the concrete, the fibre material itself is permeable to oxygen, making it easier for oxygen to pass through the concrete. As far as water permeability is concerned, EHE-08 requires a maximum water pene- tration of 50 mm. As the marks obtained are greater, it can be concluded that the concrete is quite permeable to water and, therefore, more exposed to potential damage. The high permeability shown is a consequence of a high water–cement ratio, established at 0.60. 4. Conclusions In an effort to promote sustainability in construction, this work has focused on offering an application for industrial polyethylene waste, recycling it as fibres and using it as reinforcement in concrete. Later, an analysis of its mechanical properties was carried out. The following conclusions have been drawn after analysing the results obtained. • The methodology followed for recycling the fibres does not adversely affect their mechanical behaviour; indeed, a material with better mechanical properties than the original one is obtained. • The fibres obtained by injection have a very rough surface, which improves its adher- ence to the concrete. • The addition of fibres to the concrete mix, in the proportions studied, produces a slight increase in the compressive strength of the concrete. This characteristic is linked to a 22% reduction in the porosity of the concrete. • The tensile strength is one of the main advantages of the use of concrete reinforced with polyethylene fibres in comparison to the control concrete, since with 4 kg/m3 of fibres it is possible to increase resistance by 36.71%. • Polyethylene fibres also demonstrate an excellent capacity for controlling cracks in concrete. • A more thorough study of the durability of concrete with polyethylene fibres is required, as well as an analysis of the resistance of the fibres in an alkaline environment. • Concretes with higher fibre percentages should be produced to check whether an in- crease in fibre content leads to an improvement in the tensile behaviour of the concrete. The experimental results confirm the initial hypothesis concerning the potential of recycled polyethylene fibres for reinforced concrete structures. Author Contributions: Conceptualization, C.T.; Data curation, J.A.S.-A. and M.S.; Formal analysis, J.A.S.-A.; Funding acquisition, C.T.; Investigation, M.S., L.G., P.T., G.G.d.A. and A.A.; Methodology, S.D., M.S., P.T. and C.T.; Project administration, C.T. and S.D.; Supervision, C.T.; Writing—original draft, J.A.S.-A.; Writing—review & editing, C.T. All authors have read and agreed to the published version of the manuscript. Funding: This research was funded by the LADICIM (Laboratory of Materials Science and Engineer- ing), Universidad de Cantabria. E.T.S. de Ingenieros de Caminos, Canales y Puertos, Av./Los Castros 44, 39005 Santander, Spain. Institutional Review Board Statement: Not applicable. Informed Consent Statement: Not applicable. Acknowledgments: The authors would like to thank: LADICIM, the Laboratory of Materials Science and Engineering of the University of Cantabria, for making the facilities used in this research available to the authors. The authors would like to thank the “Augusto Gonzalez Linares” postdoctoral grant program of the University of Cantabria for their support. The authors would like to thank the “industrial doctoral” grant program of the Government of Cantabria for their support. Conflicts of Interest: The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.PDF Image | Recycled Polyethylene Fibres for Structural Concrete
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