Thesis (B.S.) -- Cagayan State University, 2024.
Includes bibliographical references.

This study investigates the effect of Kakawate wood ash (Gliricidia sepium) on the compressive strength of normal concrete. Concrete, a fundamental building material, typically comprises cement, sand, aggregates, and water. However, the production of Ordinary Portland Cement (OPC) is energy-intensive and significantly contributes to greenhouse gas emissions. To address these environmental concerns, this research explores the potential of Kakawate wood ash as a partial replacement for OPC in concrete mixtures.

The study was conducted in Enrile, Cagayan, where Kakawate trees are abundant. Kakawate wood was collected and burned in a controlled environment to produce ash. This ash was then characterized in terms of fineness, color, and moisture content. Concrete samples were prepared with varying proportions of Kakawate wood ash (0%, 5%, 10%, and 15%) replacing OPC in a 1:2:3 mix ratio (cement: sand: aggregates). The primary methodology included mixing the materials, curing the concrete, and conducting compressive strength tests after specific curing periods.

The research aimed to determine the optimal percentage of Kakawate wood ash that could replace OPC without significantly affecting the compressive strength of the concrete. The results indicated that while concrete with 0% Kakawate wood ash exhibited the highest compressive strength, the 5% replacement ratio achieved a compressive strength suitable for normal concrete applications. This finding suggests that Kakawate wood ash can be an effective partial replacement for OPC, offering a more sustainable and cost-effective alternative for concrete production. Researchers recommend using up to 5% Kakawate wood ash, extending curing periods to enhance strength, and conducting field trials to validate laboratory findings.

The study concludes that using Kakawate wood ash in concrete not only reduces the reliance on carbon-intensive cement but also utilizes a renewable biomass resource, thereby lowering the overall environmental impact of concrete production. This research provides valuable insights for engineers and the construction industry, promoting eco-friendly construction practices and contributing to the reduction of greenhouse gas emissions. Furthermore, the use of Kakawate wood ash could mitigate waste disposal issues and create an avenue for the sustainable management of agricultural residues, aligning with global efforts towards sustainable development and environmental conservation.

Keywords: Kakawate wood ash, Compressive Strength, Workability.