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Recycling 2021, 6, 18 7 of 19 HDPE Addition f’c10-HDPE 10% 10 × 10 mm 5 × 20 mm 2.5×40mm f’c10-HDPE 20% 10 × 10 mm 5 × 20 mm 2.5×40mm f’c25 f’c25-HDPE 2.5% 10 × 10 mm 5 × 20 mm 2.5×40mm f’c25-HDPE 5% 10 × 10 mm 5 × 20 mm 2.5×40mm f’c25-HDPE 10% 10 × 10 mm 5 × 20 mm 2.5×40mm f’c25-HDPE 20% 10 × 10 mm 5 × 20 mm 2.5×40mm Volume of Concrete (m3 ) 0.021 0.021 0.021 0.021 0.021 0.021 0.021 0.021 0.021 0.021 0.021 0.021 0.021 0.021 0.021 0.021 0.021 0.021 0.021 Table 4. Cont. Fine Coarse Water HDPE (kg) Lamellar Number of Specimens Compressive Tensile Strength Strength 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 Cement (kg) 6.25 6.25 6.25 6.25 6.25 6.25 8.75 8.75 8.75 8.75 8.75 8.75 8.75 8.75 8.75 8.75 8.75 8.75 8.75 Aggregate Aggregate (kg) (kg) (kg) 17.55 21.49 17.55 21.49 17.55 21.49 17.55 21.49 17.55 21.49 17.55 21.49 14.56 25.09 14.56 25.09 14.56 25.09 14.56 25.09 14.56 25.09 14.56 25.09 14.56 25.09 14.56 25.09 14.56 25.09 14.56 25.09 14.56 25.09 14.56 25.09 14.56 25.09 4.03 0.63 4.03 0.63 4.03 0.63 4.03 1.25 4.03 1.25 4.03 1.25 4.56 0.00 4.56 0.22 4.56 0.22 4.56 0.22 4.56 0.44 4.56 0.44 4.56 0.44 4.56 0.88 4.56 0.88 4.56 0.88 4.56 1.75 4.56 1.75 4.56 1.75 The terms used are as follows: B0 refers to normal concrete meeting the standard job mix design without the addition of HDPE lamellar, while B0-HDPE 2.5% refers to B0 concrete with the addition of 2.5% HDPE. The amount of HDPE lamellar particles for the experimental investigation is calculated on the basis of the weight of the cement used. This study used cylindrical specimens with a diameter of 150 mm and a height of 300 mm (Figure 3). The cylinder molds were made of steel to avoid leakage and hold their integrity under severe use. The mold nonabsorbent material avoids a reaction with Portland or other hydraulic cement. For each test, two samples were used for each size of HDPE lamellar particles. Accordingly, the number of samples used for the splitting tensile and cylindrical compressive strength tests was six. The total number of samples used was 156, including those for normal concrete testing. Since only two specimens were used for each design, the data were processed as average. We set a higher water/cement ratio to produce a workable concrete (minimum 0.52). Typically, the minimum water/cement ratio is 0.35–0.4, as a lower ratio may result in the concrete becoming too dry and unworkable [37]. Furthermore, the use of a higher water/cement ratio results in a high slump value. However, the addition of HDPE plastic sheets compensated for this change. To evaluate the effect of adding HDPE lamellar particles, several tests were conducted, including slump testing using the ASTM C143 standard [38], compressive strength testing using the ASTM C39 standard [39], and tensile strength testing using the ASTM C496 standard [40].PDF Image | Recycled HDPE Plastic Additions on Concrete Performance
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