EXPERIMENTAL STUDY ON STRENGTH CHARACTERISTICS OF CONCRETE WITH ALCCOFINE AND IRON WASTE AS ADDITIVES

1. Optimal Percentage of Sand Replacement with Iron Waste The experimental results indicate that replacing fine aggregate with iron waste improves both compressive and split tensile strength up to an optimum level. The best performance was observed at 10% iron waste replacement, where split tensile strength reached 2.53 MPa at 28 days, compared to 2.36 MPa for conventional concrete. Beyond this level, strength reduced, indicating that excessive replacement negatively affects performance. 2. Impact of Alccofine on Compressive Strength The study clearly shows that the incorporation of Alccofine significantly improves the compressive strength of concrete up to an optimum level. From the experimental results, compressive strength increased from 28.6 MPa (0%) to 33.5 MPa (10%) at 28 days, indicating a substantial enhancement. However, beyond 10% replacement, strength decreased, confirming that 10% Alccofine is the optimum content for achieving maximum strength. 3. Recommendations for Sustainable Concrete Manufacturing Based on the findings of this study, the following recommendations are proposed: ·                  Use Alccofine as a partial cement replacement in the range of 8–12% for general structural applications to achieve a balance between strength, durability, and sustainability. ·                  Replace fine aggregate with iron waste up to 15–20% to enhance strength while maintaining workability and avoiding segregation issues.

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