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Appl. Sci. 2022, 12, x FOR PEER REVIEW 7 of 21 Appl. Sci. 2022, 12, 2867 7 of 20 2.6. Workability Tests The Abrams cone test was carried out in accordance with the EN 12350-2:2009 stand- ard [60], seen in Figure 6. Figure 6. Measuring the height of the Abrams cone test. Figure 6. Measuring the height of the Abrams cone test. 2.8. Mechanical Properties 2.7. Physical Properties The determination of uniaxial compressive strength was based on the EN 12390-3:2009 To perform the physical characterisation tests on concrete, specimens obtained from standard [62]. In this test, standardised cubic specimens with 15 cm sides were used. cutting standardised cylinders (300 mm high and 150 mm in diameter) in 3 sub-samples The tensile splitting strength tests were carried out in accordance with EN 12390- of 100 mm high were used. The procedure followed to determine the physical properties 6:2009 [63]. This experiment was performed with samples cut from standardised cylindrical of fibre-reinforced concrete, such as the density, porosity, and absorption coefficient, was specimens; so, before proceeding with the test, a geometric characterisation of the specimen based on the EN 12390-7:2009 standard [61]. is required. 2.8. Mechanical Properties 2.9. Durability The determination of uniaxial compressive strength was based on the EN 12390- The oxygen permeability test was carried out in accordance with standards UNE 3:2009 standard [62]. In this test, standardised cubic specimens with 15 cm sides were 83966:2008 [64] and UNE 83981:2008 [65]. To conduct this test, samples previously used to used. determine the physical properties were taken. The tensile splitting strength tests were carried out in accordance with EN 12390- The water permeability test was in accordance with EN 12390-8:2009 standard [66]. Appl. Sci. 2022, 12, x FOR PEER REVIEW 8 of 21 6:2009 [63]. This experiment was performed with samples cut from standardised cylindri- The same samples that were used to determine oxygen permeability were used for this test, cal specimens; so, before proceeding with the test, a geometric characterisation of the spec- see Figure 7. imen is required. 2.9. Durability The oxygen permeability test was carried out in accordance with standards UNE 83966:2008 [64] and UNE 83981:2008 [65]. To conduct this test, samples previously used to determine the physical properties were taken. The water permeability test was in accordance with EN 12390-8:2009 standard [66]. The same samples that were used to determine oxygen permeability were used for this test, see Figure 7. (a) (b) Figure 7. (a) Water permeability test layout. (b) Example of the moisture trace after the water per- Figure 7. (a) Water permeability test layout. (b) Example of the moisture trace after the water meability test. permeability test. 3. Results and Discussion 3.1. Characterisation of Polyethylene before and after Recycling 3.1.1. Density 3 The mean density value of the polyethylene samples before recovery was 0.92 g/cm ;PDF Image | Recycled Polyethylene Fibres for Structural Concrete
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