<![CDATA[The use of sustainable materials in concrete is important to reduce dependence on conventional constituents without compromising material performance. This study investigated the effect of biochar and sodium silicate (Na₂SiO₃) on the compressive strength and porosity of Portland Composite Cement (PCC) concrete. The objective was to analyze the influence of 2% biochar and sodium silicate contents of 5%, 10%, and 15%, and to determine the optimum sodium silicate dosage. An experimental laboratory method was employed using cylindrical specimens measuring 150 × 300 mm. Compressive strength was tested at 7, 14, and 28 days, while porosity was measured at 28 days. The results showed that 5% sodium silicate provided the best performance, with a 28-day compressive strength of 16.49 MPa and the lowest porosity of 1.48%. The addition of 2% biochar alone was not sufficient to improve the 28-day compressive strength. Therefore, 5% sodium silicate was identified as the optimal dosage for producing PCC concrete with a denser internal structure and competitive mechanical performance.]]>
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