Behaviour of High-Performance Concrete using Metakaolin and Flyash

Abstract

Concrete is a versatile construction material. For more durable and strong structures, the concrete showing high performance is required. High performance concrete (HPC) is nothing new but a concrete which performs acceptable in adverse conditions. To make concrete perform acceptable, pozzolans are added as replacement to cement in concrete. Metakaolin (MK) and Flyash (FA) are such pozzolanas added to the concrete to achieve the required performance. This present study investigates the characteristics strength and durability of the HPC containing MK at various proportions of 0%, 5%, 7.5% and 10% and other mixes with 10% FA along with the above proportions of MK. In this study low water/binder ratio of 0.29 is used and hence, a high range water reducing admixture is used for enhancing the workability of the concrete. The compressive strength, splitting tensile and flexural strength test were done at 7, 28 and 56 days from the starting of curing period. The end results obtained from the compressive strength, splitting tensile strength, flexural strength and durability test like acid resistance test were compared with different levels of mineral admixtures used to get
the optimum proportion of metakaolin and flyash for the desirable performance of the concrete.