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ICADME 2021 IOP Publishing Journal of Physics: Conference Series 2051 (2021) 012043 doi:10.1088/1742-6596/2051/1/012043 3. Results and Discussions 3.1. Compressive strength test Figure 4 exhibited the graph of force versus time for different composition ratio of HDPE plastic waste. It is clearly exhibited that ratio of 1.5 of HDPE plastic waste withstand the higher maximum compressive strength value of 97.28 kN, followed by composition ratio of 1.0 HDPE plastic waste with value of 97.19 kN. The composition ratio of 0.5 of HDPE plastic waste with value of 96.98 kN and composition ratio of 0.0 of HDPE plastic waste at 96.32 kN, finally the lowest compressive strength at 96.08 kN for 2.0 HDPE plastic waste. For previous research had studied the compressive strength plastic waste used concrete was lowered by the addition of plastic. The reduction loss may be attributed to the poor bond strength between plastic particles and Portland cement. Composition ratio of 1.5 of HDPE plastic waste had higher compressive strength due to strong cohesion bonding of HDPE plastic waste, polystyrene and Portland cement of matrix bonding [12]. The compressive strength decrease start to the composition ratio of 2.0 HDPE plastic waste is mainly due to the production of LWC samples with high crack resistance require reduction in adhesive strength between the surface of the HDPE plastic waste, polystyrene and Portland cement. The hydration of cement is one of the factors restricted by means of using HDPE plastic waste which it is a hydrophobic material [13]. In addition, higher composition ratio of HDPE plastic waste presence of plastic aggregate relatively less performance when compared with effectively used others waste materials as a conservation point of view, hydrophobic material which may restrict the hydration of cement. The reduction in split tensile strength and flexural compressive strength [14]. Figure 4: Compressive strength versus time at different composition ratio of HDPE plastic waste to produce LWC samples. 3.2. Sound absorption coefficient (SAC) analysis HDPE plastic waste mix with polystyrene and Portland cement to produce lightweight concrete (LWC) is one of potential as good in sound absorption properties. In this study, the sound absorption coefficient test was conducted by impedance test tube with the range of 350 Hz to 1500 Hz. This range classified as low frequency region, as thicker composite absorbency is better for absorption for lower frequency than higher frequency region [15]. In Figure 5, the graph shows the rate of sound absorption coefficient (SAC) at low frequency 350 Hz to 1500 Hz. Based on the result, the ratio of 1.5 HDPE plastic waste has the highest sound absorbency compare to others with SAC value of 0.42 at 350 Hz and 0.47 at 1500 Hz. The data can be analyzed as 42% sound absorbed at 350 Hz. The composition ratio of HDPE plastic waste present in this sample was only 1.0. Hence, the present of lignocellulose are less compared to other sample since lignocellulose fibers are good in reduction of sound energy [16]. Moreover, 1.0 plastic waste sample has the average sound absorption coefficient. As a conclusion, when the ratio of 4PDF Image | analysis of HDPE plastic
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