Abstract
This article presents the evalution of strength properties of High-Performance Concrete (HPC) due to the addition of nanosilica and metakaolin. Metakaolin partially replaces the cement at 10%, 20%, and 30% by weight. The addition proportions of nanosilica are 0%, 1. 5%, 3.0%, and 4.5% by weight of binder for each of the metakaolin replacement levels. Water-to-binder ratios of 0.3, 0.325, 0.35, 0.375, 0.4, and 0.425. The hardened HPC mixes were tested for their compressive, split tensile, and flexural strength at 7 and 28 days. Additionally, the compressive strength test was carried out after 90 days of curing to study the long-term strength development. The obtained results were compared with conventional concrete as a reference mix. HPC with 10% metakaolin, 3% nanosilica and 0.3 water-to-binder ratio yielded the best performance with 36.11%, 31.75% and 34.59% improvement in 7, 28 and 90 days compressive strength respectively. The improvement in split tensile strength were 25.24% and 40.26% at 7 and 28 days respectively. The flexural strength was enhanced by 41.10% and 30.30% at 7 and 28 days respectively. Furthermore, mathematical relationships between cube compressive strength and split tensile strength, flexural strength were derived from the experimental results of this investigation.
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