Utilizing Palm Oil Fuel Ash (POFA) in concrete mix is a major way of turning waste to wealth. Gravel as an aggregate is cheaper than granite. Thus, obtaining an optimum combination of these materials in achieving a maximum compressive strength in concrete will go a long way in helping the construction industry.The study was carried out to establish an optimum replacement ratio for Palm Oil Fuel Ash (POFA) blended granite-gravel of concrete. Uniform water/binder (w/b) ratio of 0.5 and mixes ratio of 1:2:4 was utilized. Thirteen runs of experiments plus control were designed using the Central Composite Response Surface method (Design Expert). Based on the analysis, the increase in granite volume led to increase in compressive strength. However, increase in POFA percentage led to decrease in compressive strength at 7, 28, 56 and 90 days curing ages. The study also observed highest compressive strength at 25% POFA replacement and lowest at 35% replacement. Also, for granite, highest and lowest compressive strength were achieved at 100% and 0% replacement respectively. However, for slump height, the higher the percentage of granite or POFA in concrete, the higher the slump height. The optimization analysis showed that, at 29.69% POFA and 98.75% Granite, compressive strength of 24.29 N/mm2 and slump height of 89.36mm were achieved. The optimum strength found is slightly higher than the maximum strength achieved (24.27N/mm2) at 90 days and also, slightly lower than the control (25.33 N/mm2).
Frontiers, E. & SHERIFF, B (2022). Evaluation of Mechanical Properties of Palm Oil Fuel Ash (Pofa) Blended – Granite - Gravel Concrete. Afribary. Retrieved from https://afribary.com/works/evaluation-of-mechanical-properties-of-palm-oil-fuel-ash-pofa-blended-granite-gravel-concrete
Frontiers, Edu, and BABAGANA SHERIFF "Evaluation of Mechanical Properties of Palm Oil Fuel Ash (Pofa) Blended – Granite - Gravel Concrete" Afribary. Afribary, 08 Jan. 2022, https://afribary.com/works/evaluation-of-mechanical-properties-of-palm-oil-fuel-ash-pofa-blended-granite-gravel-concrete. Accessed 24 Jan. 2022.
Frontiers, Edu, and BABAGANA SHERIFF . "Evaluation of Mechanical Properties of Palm Oil Fuel Ash (Pofa) Blended – Granite - Gravel Concrete". Afribary, Afribary, 08 Jan. 2022. Web. 24 Jan. 2022. < https://afribary.com/works/evaluation-of-mechanical-properties-of-palm-oil-fuel-ash-pofa-blended-granite-gravel-concrete >.
Frontiers, Edu and SHERIFF, BABAGANA . "Evaluation of Mechanical Properties of Palm Oil Fuel Ash (Pofa) Blended – Granite - Gravel Concrete" Afribary (2022). Accessed January 24, 2022. https://afribary.com/works/evaluation-of-mechanical-properties-of-palm-oil-fuel-ash-pofa-blended-granite-gravel-concrete