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ICADME 2021 IOP Publishing Journal of Physics: Conference Series 2051 (2021) 012043 doi:10.1088/1742-6596/2051/1/012043 plastic waste increases, the absorbency of sound energy also decreases [17]. Lowest reflection energy indicates higher sound absorption result in good absorbency of sound energy [18]. 3.3. Water Absorption test The graph in Figure 6 shows the water absorption analysis at different composition ratio of HDPE plastic waste for lightweight concrete (LWC) samples. The highest value water absorption test is 11.06% for the composition ratio of 0.5 HDPE plastic waste and the lowest value of water absorption is 2.0 HDPE plastic waste at 8.28%. It is revealed that 2.0 of HDPE plastic waste have the higher water resistance compared to other samples due to less presence of voids and the material of higher composition of HDPE plastic waste the reason of water resistance characteristic of the samples [19]. Meanwhile, the 0.5 HDPE plastic waste have more voids present in LWC samples that leads to higher water absorption. For ratio of 1.0 of HDPE plastic waste and 1.5 of HDPE plastic waste, the water absorption was 9.81% and 9.20%, respectively. This can be analyzed as the average range of voids present in both samples that influence the water absorption rate. In conclusion, the ratio of the increasing of HDPE plastic waste in LWC samples will produce lower water absorption properties [20]. Figure 5. Sound absorption coefficient (SAC) Figure 6. Water absorption test at different at different composition ratio of HDPE plastic composition ratio of HDPE plastic waste for LWC waste for LWC samples samples 4. Conclusion In conclusion, the optimum composition ratio of HDPE plastic waste is 1.5 reinforced with polystyrene and Portland cement. From the findings, the compressive strength test of 1.5 HDPE plastic waste produce 97.28 kN, sound absorption coefficient (SAC) at 0.42 at 350 Hz and 0.47 at 1500 Hz and water absorption at 9.2% is better physical and mechanical properties to be potential apply in lightweight concrete (LWC) for partition panel application. The additional of waste substances of HDPE plastic waste and polystyrene waste give environmental impacts of LWC production. 5. References [1] Chen, H.L., Nath, T.K., Chong, S., Foo, V., Gibbins, C. & Lechner, A.M. (2021). The plastic waste problem in Malaysia: management, recycling and disposal of local and global plastic waste. SN Applied Sciences, 3(437), pp. 1 – 15. [2] Lebreton, L. & Andrady, A. (2019). Future scenarios of global plastic waste generation and disposal. Human and Social Sciences Communications, Palgrave Communications, 5(6), pp.1–11. [3] Marsi, N., Subramaniam, L., Rus, A.Z.M., Sulong, N., Fodzi, M.H.M., Huzaisham, N.A., Yusuf, N.A.A.N., Mahmood, S., Shaari, F. and Shariff, H.H. (2020). The Mechanical Performance of Pipe Based on Fiberglass Reinforced with Plastic Waste (FRPW) Composites. IOP Conference Series: Materials Science and Engineering, vol.854(1), pp.1-7. 5PDF Image | analysis of HDPE plastic
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