Pemanfaatan Limbah Plastik HDPE sebagai Substitusi Agregat Halus dalam Pembuatan Bata Ringan CLC: Studi Eksperimental

Abstract

This research focuses on the utilization of High-Density Polyethylene (HDPE) plastic waste as a substitute for fine aggregate in the manufacture of Cellular Lightweight Concrete (CLC) bricks. The main objective is to analyze the effect of using HDPE waste on the physical and mechanical properties of lightweight bricks. The research results show that the addition of HDPE plastic waste has a significant influence. The compressive strength of lightweight bricks decreases with increasing HDPE content, from 1.16 MPa at 0% HDPE to 0.92 MPa at 15% HDPE. The highest oven-dry density was obtained in the 0% HDPE variation with 830,883 kg/m³, but decreased at higher HDPE contents. Water absorption increases from 15,43% at 0% HDPE to 23,29% at 15% HDPE, while porosity increases from 12,79% at 0% HDPE to 17,57% at 15% HDPE. Microstructural analysis reveals the dominance of oxygen and calcium in the chemical composition of HDPE, which can potentially affect the material properties. The impact resistance test shows optimal performance in the 5% and 15% HDPE variations, while the fire resistance test indicates a more even heat distribution at higher HDPE contents. Economic analysis shows an increase in production costs with the increase in HDPE percentage, from Rp10,000 per unit (0% HDPE) to Rp27,739 per unit (15% HDPE). Overall, this study concludes that the utilization of HDPE waste as a substitute for fine aggregate in CLC lightweight bricks has a significant impact on the properties of the bricks, with the potential for cost savings and increased sustainability, but requires careful consideration of the optimal composition.