Behavior of Concrete Strength Using Cement Blended With GGBFS and Fly Ash
DOI:
https://doi.org/10.30742/ijremte.v3i1.31Keywords:
GGBFS, fly ash, cement, concrete, the compressive strength, splitting tensile strengthAbstract
The concrete is produced using sand as fine aggregate, crushed stone as coarse aggregate, and mixed with cement and water as the binder. In this study, the focus is on cement mixed with waste material, namely GGBFS and fly ash. Fly ash is a waste product from combustion used in PLTU (Coal-fired Power Plant). GGBFS (Ground Granulated Blast Furnace Slag) is a residue formed during the heating and cooling processes in a blast furnace during steel fabrication. Fly ash and GGBFS contain SiO2; therefore, they can be used as cement substitutes.
Based on this, the research was conducted by combining cement, GGBFS, and fly ash to determine the strength of concrete. In this study, GGBFS was used at 10%, 20%, 30% of the cement weight, while fly ash was used at 10% of the cement weight. The water-cement (w/c) ratio was 0.5. The test results showed that a concrete mixture with 10% GGBFS and 10% fly ash achieved an optimal compressive strength of 50.10 MPa. This indicates that GGBFS and fly ash can be used as partial cement substitutes, with the optimum percentage being 10% for both materials. The result of the splitting test showed that concrete containing 10% GGBFS and fly ash achieved a high tensile strength of 5.06 MPa. The ratio of splitting tensile to compressive strength indicated that concrete containing GGBFS and fly ash had an average splitting tensile strength of 10–11%, indicating good tensile performance.
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