Analysis of Waste Orange Peel Ash as Cement Substitution in Concrete Mix

Analis Pengujian Bahan Abu Limbah Kulit Jeruk Sebagai Substitusi Semen Pada Campuran Beton

Abstract

Cement production significantly contributes to high carbon emissions and energy consumption, creating an urgent need for sustainable alternatives. This research analyzes the utilization of waste orange peel ash as a partial substitution for cement in concrete mixtures. The ash was produced through the calcination process of orange peel waste and sieved to meet fineness standards. Tests conducted include fineness, specific gravity, setting time, compressive strength, and splitting tensile strength, with substitution levels of 0%, 5%, 10%, 15%, and 25%. The results indicate that orange peel ash exhibits pozzolanic-like physical characteristics and can function as a cement substitute at certain proportions. Lower substitution levels (2.5–10%) still provided acceptable compressive strength for structural concrete, while higher levels (≥15%) significantly reduced performance. Therefore, waste orange peel ash shows potential as an eco-friendly alternative material, supporting circular economy principles and reducing the environmental impact of the construction industry.