The Effectiveness of Bioconc in Increasing the Compressive Strength of K-250 Concrete with Cement Reduction

This study aims to determine the effect of reducing cement usage on the compressive strength of K-250 grade concrete by using Bioconc as an additive. The background of this research is rooted in the need for environmentally friendly and efficient construction materials, considering that the cement industry is one of the largest contributors to global carbon emissions. Bioconc is a bio-based additive containing microorganisms capable of producing calcium carbonate (CaCO?) through metabolic processes, which helps fill concrete pores and strengthen its internal structure. The research employed an experimental method with variations in cement reduction of 10%, 13%, and 15% from the standard composition of K-250 concrete. Each mix was supplemented with Bioconc according to the recommended dosage. Compressive strength tests were conducted at 28 days following the SNI 03-1974-1990 standard. The results showed that a 15% cement reduction with Biocon addition achieved the highest compressive strength at 271.50 Kg/Cm², surpassing the normal concrete (269.28 Kg/Cm²). Meanwhile, reductions of 10% and 13% resulted in lower compressive strength. In conclusion, Bioconc can be used as an effective additive to partially replace cement in K-250 concrete mixtures, but only at optimal reduction levels. These findings offer a promising avenue for developing more sustainable concrete technologies without compromising structural quality.