Studies on Rheology, Strength and Cementing Efficiency of High Strength Grade Quaternary Blended Self-Compacting Concrete Incorporating High Reactivity Metakaolin

Seshagiri Rao M V; Shrihari S; Srinivasa Reddy V

Seshagiri Rao M V CVR College of Engineering, Department of Civil Engg., Hyderabad, India
Shrihari S JBIET, Department of Civil Engineering, Hyderabad, India
Srinivasa Reddy V GRIET, Department of Civil Engineering, Hyderabad, India

Abstract

The present work aims at determining the most suitable mix proportion that can produce metakaolin based quaternary blended high strength SCC of desirable strength. The results of this study will lead to the reduction of the usage of cement, further sustainable development in the concrete industry by reusing industrial waste by-products (SCMs) as cement replacements and reducing harmful impact on the environment. This study systematically investigate the synergistic effect of metakaolin (MK) and microsilica (MS) on fresh and strength properties of fly ash based SCC of M80 grade. These results are compared to establish the enhanced micro-structural and engineering properties of metakaolin based quaternary blended SCC.By incorporating MK into MS+FA based ternary blended SCC mixes, the amount of fly ash used has almost doubled. From this observation, it can be concluded that MS in blended SCC mixtures imparts high strength while MK inclusion enhances the usage of high quantity of fly ash in SCC mixes for similar strengths and flow properties.The quaternary blended fly ash based M80 grade SCC mix made of MS and MK together is found to be superior to ternary blended fly ash based M80 grade SCC mix made with MS or MK due to reason that for similar strength, less cement is used and more fly ash quantity is consumed. Efficiency factor for quaternary blended SCC mix reveals that for similar strength, 50% of cement can be replaced with FA28%+MS11%+MK11% combination of pozzolanic mixture.