Nurfajriani, A. Nasir Pulungan, M. Yusuf, Herlinawati, A. Sudrajat, Z. Wirna, Y. Wahyudi
The production of fly ash and blood cockle shells is growing year, but their application is still quite limited, making them waste materials that could contaminate the environment. The purpose of this study is to reduce the amount of cement used to make bricks by using coal fly ash waste (fly ash) as an alternative material that is mixed with blood cockle shells. Three repetitions and a completely randomized design were used in the creation of this study. Fly ash and cockle shell composition varied from 7.5: 4.69 to 10: 4.02, 12.5: 3.35, and 15: 2.68%. 28 days were needed for the sample to spontaneously harden after the manual molding procedure. The following characterisation characteristics were used: compressive strength, density, porosity, morphology, and water absorption. The best density value of 1.64 g/cm3 was obtained by bricks that had SiO2 and CaO added at 12.5% and 3.3%, respectively, according to the test findings. The combination of SiO2 and CaO 10;4.02% had the lowest water absorption and porosity values (WA = 6.43%, porosity = 12.93%), the best morphology, and the maximum compressive strength (298.04 kg/cm2) in the water absorption, porosity, and compressive strength tests. Every brick sample produced for this study satisfies SNI requirements and is classified as a quality I brick. © 2026 Author(s).
Department of Chemistry, FMIPA, Universitas Negeri Medan, Indonesia
