Investigating the Impact of Sika Admixtures on the Physico-Mechanical Properties of Concrete Formulated with Different Cement Types

Abstract

This dissertation investigates the impact of Sika admixtures (Sikalite, Sikalatex, and Sikaviscocrete) on the physico-mechanical properties of concrete formulated with different types of cement, specifically Ordinary Portland Cement (Dangote 42.5) and Pozzolanic Cement (CIMAF 42.5). Despite the widespread use of Sika admixtures in concrete production, there remains limited understanding of their effects on concrete performance across various cement types. The overall objective of this study was to optimize concrete formulations to enhance strength and durability in diverse environmental conditions. The research employs the Dreux-Gorisse method for concrete mix design, targeting a compressive strength of 25 MPa. Laboratory tests assessed compressive strength, workability, density, and water absorption of concrete samples with varying percentages of three types of Sika admixtures: Sikalite, Sikalatex, and Sikaviscocrete. Key findings reveal that the incorporation of Sika admixtures significantly enhances concrete properties. For instance, 7-day compressive strength increased by 31% with Sikaviscocrete, achieving 23.1 MPa for Ordinary Portland Cement and 22.3 MPa for Pozzolanic Cement. Workability improved considerably, with an average slump of 49 mm for Sikaviscocrete compared to control mixes. Water absorption tests indicated a reduction of approximately 42%, underscoring enhanced durability. In conclusion, Sika admixtures effectively optimize concrete performance, making them particularly suitable for applications requiring high strength and durability. This study offers valuable insights for engineers aiming to improve concrete formulations through strategic use of chemical admixtures.