CHICKEN EGGSHELL WASTE POWDER AS A PARTIAL REPLACEMENT FOR FLY ASH IN GEOPOLYMER CONCRETE
DOI:
https://doi.org/10.33736/jcest.9361.2026Keywords:
compressive strength, concrete, eggshell powder, fly ash, geopolymerAbstract
This study investigates the compressive strength of geopolymer concrete incorporating chicken eggshell powder as a partial replacement for fly ash. The objective is to evaluate the impact of eggshell powder on the properties of geopolymer concrete, specifically its slump value, specific gravity, and compressive strength. The experimental procedure utilized concrete designed for a 25 MPa strength, producing 45 cylindrical specimens measuring 10 cm in diameter and 20 cm in height. The specimens were cured in an oven at a constant temperature of 60°C for 4 hours. Thereafter, they were stored under ambient conditions for 1 day and then immersed in a water-curing tank until one day prior to the designated testing age. Compressive strength tests were conducted at curing ages of 7, 14, and 28 days. The findings indicate that a 10% substitution of chicken eggshell powder yields optimal results, achieving a compressive strength of 25.25 MPa—slightly above the target strength by 1%. As the substitution level increased, the slump value declined, ranging from 6 cm at 0% eggshell powder to 2 cm at 25%. The highest specific gravity was recorded at 10% substitution (2409.55 kg/m³), while the lowest was 2251.59 kg/m³. The maximum compressive strength was observed at 10% substitution after 28 days, showing a 12.77% improvement compared to the control sample. Conversely, increasing the substitution beyond 10% led to a significant reduction in compressive strength, with a 34.18% drop at 25% substitution. The findings demonstrate that chicken eggshell waste can be effectively utilized as a sustainable supplementary precursor in geopolymer concrete. The optimum substitution level of 10% not only improved compressive strength but also provides an environmentally beneficial pathway for reducing agricultural waste disposal and decreasing reliance on conventional industrial materials in sustainable construction.
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