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observation is made about the elastic modulus estimated from the experimental tensile stress- strain data: value of Er.HDPE ≈ 0.50 GPa and about half of the typical values of the elastic modulus of commercially available PP or the engineering grade HDPE plastics. Therefore, while the mechanical properties of HDPE are degraded by recycling process and the physical properties remain similar to those of the new HDPE, they overally remain lower than the typical engineering properties of new PP. Table 2: Physical properties of recycled (r.) HDPE compared with those of the typical new HDPE and polypropy- lene (PP). Property Yield strength Elastic modulus Ultimate strength Yield strain Ultimate strain Density Thermal expansion Melting point Flash point Ignition point 2.3. Concrete and FRC specimens Units r.HDPE MPa 12.0 GPa 0.50 MPa 37.0 % 4.0 % 28 g/cm3 0.94 1/K 12.6 · 10−6 ◦C 129 ◦C 448 ◦C 487 New HDPE 40 ÷ 80 0.90 ÷ 1.10 30.0 ÷ 60.0 10 ÷ 12 120 ÷ 180 0.93 ÷ 0.96 12.0 · 10−6 130 ÷ 140 430 ÷ 480 480 ÷ 500 New PP 30 ÷ 60 1.20 ÷ 1.50 70 ÷ 80 10 ÷ 12 150 ÷ 200 0.90 ÷ 0.92 11.5 · 10−6 150 ÷ 160 480 ÷ 500 520 ÷ 535 Table 3: Fibre reinforced concrete (FRC) mixes. Concrete Series fibres slump air label % [mm] % Plain concrete C1 - 65 3.2 FRC(fibres:Ø1 =0.25mm,L1 =23mm) C2 0.40 36 3.4 (ra1 = 92) C3 0.75 22 3.3 C4 1.25 17 3.4 FRC(fibres:Ø2 =0.40mm,L2 =30mm) C5 0.40 33 3.2 (ra2 = 75) C6 0.75 18 3.4 C7 1.25 13 3.3 Seven mixes of concrete were produced to cast a series of test specimens: one of plain concrete and, for each of the two available fibre diameters Ø1 = 0.25 mm and Ø2 = 0.40 mm, three series with 0.40%, 0.75% and 1.25% of added fibres (by volume). The details of the individual concrete mixtures, with designations from C1 (plain concrete) to C7, are given in Table 3 together with the lengths, L, and the aspect ratios, ra = L/Ø, of HDPE fibres. The 4PDF Image | Mechanical properties of concrete reinforced with recycled HDPE
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