Funct. Mater. 2025; 32 (3): 380-385.
Investigation of the mechanical characteristics of composites based on CFA and rLDPE
1Department of Mechanical Engineering, Faculty of Engineering, Halu Oleo University, 93232 Kendari, Indonesia
2Department of Civil Engineering, Faculty of Engineering, Halu Oleo University, 93232 Kendari, Indonesia
3Department of Management, Faculty of Business and Economics, Halu Oleo University, 93232 Kendari, Indonesia
The effect of coal fly ash (CFA) as a filler in recycled low-density polyethylene (rLDPE) matrix composites on the compressive strength, flexural strength and flexural modulus of this material was investigated. The composites were prepared by blending CFA and rLDPE at levels of 20 wt%, 30 wt% and 40 wt% CFA with 80 wt%, 70 wt% and 60 wt% rLDPE. Mixing was carried out at 160 °C until the rLDPE melted, then CFA was added and mixed until homogeneous. The mixture was then poured into a mold and subjected to direct molding. Compressive strength tests were performed according to ASTM D695 and flexural strength tests according to ASTM D790-03. SEM analysis was used to characterize the microstructure of the composite. The results showed that the composite with 20 wt% CFA and 80 wt% rLDPE provided the highest compressive and flexural strength of 9.60 MPa and 16 MPa, while higher proportion of CFA reduced the compressive strength. SEM analysis shows that good distribution of CFA in rLDPE matrix improves the mechanical properties of the composite.
1. A. N. Mak′sudah, Y. A. Saputro, D. Rochmanto. Stabilization of Fly Ash, Bottom Ash, and Cement Mixtures on the Effect of Unconfined Compression Test Values, Indonesia (2023). [in Indonesian]
2. D. Bawono R. B. Muin, Effect of Activator Molarity (NaOH) on Geopolymer Concrete with Fly Ash Waste Binder from Lontar PLTU, Indonesia (2023). [in Indonesian]
3. P. Mayana, G. Kavyasree, P. L. Narasimhulu, S. G. A. Hussain, E. M. Reddy, N. Syman, in : Conf. Ser. Mater. Sci. Eng. (2022), p. 12081 [in English]
4. W. S. Winanti, W. Purwanta, W. Wiharja, in : Iop Conf. Ser. Earth Environ. Sci. (2022), p. 12003 [in English]
5. G. L. Golewski, Materials, 16, 5218 (2023).
6. C. Lim, M. H. M. Pisal, K. C. Lim, M. N. Baddrulsham, J. Adorna, Key Eng. Mater., 997, 71 (2024)
7. I. M. A. Markuwat, W. T. Putra, Y. Winardi. The Effect of Waste Plastic Mixture of LDPE and PET with Polyester Resin Matrix on Tensile Strength and Microstructure, Indonesia (2022). [in Indonesia]
8. S. M. Kumar, M. K. Vishwanathaiah, A. Bharatish, M. Basavanappa, N. Namdev, M. Nagaral, Appl. Res., 3, 2132 (2024).
9. S. Huang, C. Zhou, Z. Xin, Ind. Eng. Chem. Res., 63, 1396 (2024)
10. S. Widodo, R. Alfirahma, A. Prawiranegara, M. F. Amir, A. N. Dewi, Civ. Eng. J., 9, 437 (2023).
11. C. Turan, A. A. Javadi, R. Vinai, Materials (Basel)., 15, 1845 (2022).
12. D. Mohamad, S. Beddu, N. L. Mohd Kamal, Meena, S. Karim, in : MATEC Web Conf. (2024), p 01006 [in English]
13. A. M. Mayet, A. A. Al-Qahtani, R. M. A. Qaisi, I. Ahmad, H. H. Alhashim, E. Eftekhari-Zadeh, Buildings, 12, 1743 (2022).
14. J. Zhang, K. Yang, X. He, Z. Wei, X. Zhao, J. Fang, Metals (Basel)., 12, 1155 (2022).
15. H. Tariq et al., Polymers (Basel)., 14, 1774 (2022).
16. C.-W. Chuang, T.-A. Chen, R. Huang, Appl. Sci., 13, 13212 (2023).
17. A. I. Candra, F. Romadhon, F. M. Azhari, E. F. Hidiyati, Increasing Compressive Strength of the Red Brick With Fly Ash and Rice Husk Ash, Indonesia (2022). [in Indonesia]
18. M. El Messiry, M. Elmor, J. Ind. Text, 54 (2024).
19. İ. BİLİZ Y. H. Çelik, Eur. J. Tech., 12, 117 (2022)
20. W. Mu et al., Polym. Compos., 45, 12199 (2024).
21. B. Rollastin, J. Juanda, Y. Oktriadi, G. M. Rahmatullah, Simulation Analysis of the Effect of the Strength of HGM Alloy and Natural Fiber Composite Materials on Ballistic Test Strength, Indonesia (2023). [in Indonesia)
22. A. Hariyanto, SEM (Scanning Electron Microscope) Analysis and Microphotographs on Corn Stalk Fiber Composite Materials with Polypropylene Plastic Matrix, Indonesia (2023). [in Indonesia]
23. J. Fajrin, I. Permatasari, H. Hariyadi, M. Eniarti, S. Suparjo, P. Pathurahman, Tensile and Flexural Strength of Polyester-Abaca Composites Exposed to Aggressive Environments, Indonesia (2023). [in Indonesia]
24. S. Hastuti, X. Salahudin, A. A. N. Irsan, A. Nurdin, Analysis of Adhesive Bonding Strength of Single Overlap Joint of Aluminum 6063 - Coconut Fiber Composite, Indonesia (2023). [in Indonesia]
25. Y. YUNASFI, P. Purwanto, M. Mashadi, Utilization Of Hem Technique For Growth Of Cnt From Graphite Powders By Using Ni As Catalyst, Indonesia (2023). [in Indonesia]