Rheological Properties of Self-Compacting Lightweight Concrete with Metakaolin

Abstract

To escalate the structural efficiency of concrete is one of the best practices to achieve sustainability of concrete. Development of high strength lightweight aggregate self-compacting concrete has significant importance in this circumstance. Due to lower strength of the porous lightweight aggregate, it is very much necessary to improve the strength of the binder that is used in the concrete. Incorporation of metakaolin in the binder is one such practice to improve the strength of the binding material and to achieve these rheological properties of the concrete is very important. The present study evaluates the rheological and mechanical properties of high strength self-compacting lightweight aggregate concrete developed using metakaolin. SCCs were developed with binder content of 550�kg/m3 and water-binder ratio of 0.28, having metakaolin replacement percentages of 7.5, 10, 12.5 and 15%. Fresh properties of all the developed concretes using metakaolin were satisfying the SCC criteria. The compressive strength of the concretes increased due to the addition of metakaolin. At higher replacement level of metakaolin, it was also observed that the yield stress and plastic viscosity of the concrete increased. All these evidences justify that metakaolin is a potential material for the development of high strength lightweight self-compacting concrete which not only improves the rheological properties but also the mechanical properties of SCCs. � RILEM 2020.