Utilization of Power Plant and Agricultural Waste as A Cement Substitute on The Compressive Strength of Environmentally Friendly Concrete

purnomo, julyan
kamil, firmanilah

Journal of Green Science and Technology
Vol 9 No 1 (2025): Journal of Green Science and Technology Vol. 9 No. 1 March 2025

This study aims to assess the effect of using Fly Ash and Rice Husk Ash as cement substitutes in the manufacture of environmentally friendly concrete. Fly Ash, a waste from coal-fired power plants, and Rice Husk Ash, an agricultural waste, were used as partial cement substitutes in four concrete mix variations, viz: normal concrete without substitution (N), concrete with 20% Fly Ash (K), concrete with a combination of 10% Fly Ash and 10% Rice Husk Ash (L), and concrete with 20% Rice Husk Ash (M). The compressive strength test was conducted at the age of 7 days, 14 days, and 28 days. The results showed that concrete with 20% Fly Ash (K) produced the most optimal compressive strength, especially at longer concrete ages. Concrete with Rice Husk Ash substitution (M) and a combination of Fly Ash and Rice Husk Ash (L) showed lower compressive strength than normal concrete (N) and Fly Ash alone. Therefore, the use of Fly Ash at 20% gave the best compressive strength results among the variations tested. Keyword: Cement Substitution, Compressive Strength, Eco-friendly concrete, Fly Ash, Rice Husk Ash