PERFORMANCE EVALUATION OF CONCRETE MIXTURE WITH HYBRID BLENDS OF METAKAOLIN AND GRANITE DUST

This research investigates concrete mixture with blend of metakaolin and granite dust. The presence of microcracks is one of the major problems associated with cement concrete. Metakaolin proves to be useful in modifying the strength properties of concrete while granite dust improves concrete workability. This project helps to report the optimization of M20 grade concrete produced with metakaolin and granite dust. The chemical properties of the materials were conducted using X-ray Fluorescence (XRF). The setting time and consistency of the paste were determined. Cement replacements by MK and GD at different ratios were studied. The consistency of cement was 29% and increased with increasing Mk and GD content at equal quantities. At 5, 10, 15, and 20% cement replaced by Mk and GD, the values were 34, 35, 37, and 41%. The result of the slump test for the concrete with Mk and GD showed that at 0% (control), the result was 42 mm, 5% (Mk 2.5%, GD 2.5%) was 44 mm, 10% (Mk 5%, GD 5%) was 46 mm, 12.5% (5% Mk, 7.5% GD) was 49 mm, 17.5% (10% Mk, 7.5% GD) was 53 mm, and 20% (10% Mk, 10% GD) was 55 mm. Compressive, tensile and flexural strengths test were conducted on the concrete samples at 3, 28 and 56 days of curing. The strength properties were analysed and modelled using Design Expert 13 Software. Finally, the microstructural analysis will be carried out. The findings of this research will also contribute to the knowledge base regarding sustainable construction materials and provide valuable information for construction industries, architects, engineers, policymakers and building construction regulators.