<![CDATA[General Background Compressive strength development defines the load-bearing capacity and structural performance of concrete over curing ages. Specific Background Chemical admixtures such as PKAN-55 and BAAS-MIXPLAST 140 W alter cement hydration kinetics and early-age performance. Knowledge Gap However, the precise dosage-dependent non-linear strength gain dynamics of B30 concrete modified with these specific admixtures remain insufficiently quantified across long-term ages. Aims This study investigates the compressive strength kinetics of B30 concrete incorporating PKAN-55 and BAAS-MIXPLAST 140 W at dosages from 0.6% to 1.0% up to 56 days. Results Experimental testing revealed optimum dosages of 0.7% for PKAN-55 and 0.9% for BAAS-MIXPLAST 140 W, yielding 28-day compressive strengths of 43.41 MPa and 41.55 MPa, representing strength increases of 8.47% and 3.82% over control concrete, respectively. Novelty A non-linear relationship between admixture dosage and strength development kinetics was established, showing 80–90% 28-day strength gain within 7 days. Implications These findings establish critical mix design parameters for accelerating early construction formwork removal and enhancing structural performance. Keywords : B30 Concrete, Chemical Admixture, Compressive Strength, Strength Kinetics, Optimum Dosage Key Findings Highlights Optimum dosages of 0.7% PKAN-55 and 0.9% BAAS-MIXPLAST 140 W increase 28-day compressive strength by 8.47% and 3.82%. Modified mixtures achieve 80% to 90% of their design strength within the first 7 days of curing. Exceeding optimum chemical admixture dosages causes non-linear strength reduction beyond design thresholds.]]>
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