Optimization of Compressive Strength of K-350 Concrete with Sika Viscocrete-3115 N Superplasticizer Additive

Concrete is one of the most widely used construction materials in various infrastructure projects due to its high compressive strength and durability. However, in practice, improving concrete quality is often necessary to meet higher strength standards, one of which is through the use of admixtures such as superplasticizers. The method used in this study is a laboratory experiment with variations in superplasticizer content of 3%, 5%, 6%, 7%, and 10% by cement weight. Compressive strength testing was conducted at concrete ages of 3 days, 7 days, 14 days, 21 days, and 28 days following the SNI 03-2834-2000 standard. The results showed that the addition of Superplasticizer Sika Viscocrete-3115 N significantly increased the compressive strength of concrete compared to concrete without admixtures. The maximum compressive strength was achieved at a specific dosage variation, while excessive use of the superplasticizer reduced concrete strength due to increased porosity.