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Recycling 2021, 6, 18 f’c10; (c) f’c25. 3.3. Tensile and Compressive Strength Tensile and compressive strengths are the important mechanical properties that iden- tify concrete performance. Figures 7 and 8 display the results of splitting tensile and cy- 11 of 19 Recycling 2021, 6, x FOR PEER REVIEW 10 × 10 mm 5 × 20 mm 2.5 × 40 mm B0 12 of 21 (a) lindrical compressive strength tests for the concrete mixtures containing HDPE addition (the testing results are shown in Appendix A). Our experiments indicated that the strength varied depending on the HDPE content and sizes. 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 4 3 2 1 0 5 4 3 2 1 0 2.5 5 10 20 HDPE % 2.5 5 10 20 HDPE % 10 × 10 mm 5 × 20 mm (b) 2.5 × 40 mm f'c10 Tensile strength (MPa) Tensile strength (MPa) Tensile strength (MPa) 2.5 5 10 20 HDPE % 10 × 10 mm 5 × 20 mm 2.5 × 40 mm f'c25 (c) Figure 7. Tensile strength of concrete mixtures as a function of HDPE content and lamellar shape: Figure 7. Tensile strength of concrete mixtures as a function of HDPE content and lamellar shape: (a) B0; (b) f’c10 MPa; (c) f’c25 MPa. In line with the job mix design shown in Table 3, the concrete aggregate content and w/c ratio had an effect on tensile and compressive strength. Figure 7 shows that the B0 concrete had a lower tensile strength, compared to f’c10 and f’c25. We observed also that the percentage and HDPE sizes behaved differently on concrete strength. Although all sizes of HDPE lamellar had an equal surface area (1 cm2), they produced a different re- sponse. In this case, we found that for all concrete classes, the addition of HDPE up to 5% showed higher tensile strength compared to other percentages (above the baseline), and (a) B0; (b) f’c10 MPa; (c) f’c25 MPa.PDF Image | Recycled HDPE Plastic Additions on Concrete Performance
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