EXPERIMENTAL STUDY ON BEHAVIOUR OF FIBER REINFORCED TERNARY BLENDED CONCRETE USING DIFFERENT TESTS

The construction techniques have been modernized with focus on high strength, dense and uniform surface texture, more reliable quality, improved durability, and faster construction. High strength concrete is a type of high performance concrete with a specified compressive strength of 50Mpa or greater. Optimum concrete mixture design results from locally available materials that make the fresh concrete place-able and finish-able and that ensure the strength development and other desired properties of hardened concrete as specified by the designer high strength concrete containing metakaolin and flyash as admixture along with crimped fibers were cast and tested to study the mechanical properties. The concrete was designed to have compressive strength of 60Mpa. Pozzolona’s such as metakaolin and flyash as mineral admixture imparts additional strength to the concrete by reacting hydration products to create additional c-s-h gel. The part of the paste responsible for strength, a common practice is to use a super plasticizer. Concrete mixes containing varying percentages 0%, 5%, 10%, 15% and 20% replacement of cement by metakaolin and flyash with constant w/c ratio of 0.32 and 0.25%, 0.5%, 0.75% and 1% by volume of crimped fibers were also prepared. The effect of mineral admixture with and without crimped fibers on the hardened properties of concrete was investigated. Mixtures with metakaolin and flyash at higher percentages replacement exhibited lower workability, less bleeding and slightly lower air content. Mixtures incorporating metakaolin with fibers developed marginal increase in compressive strength, split tensile strength and greater flexural strength and more ductility at higher percentages of fibers at all ages. The enhancement was more pronounced as the age of curing is more, i.e. 28 days. This report concentrates mainly on studying the basic strength properties like cube compressive strength. Split tensile strength and modulus of rupture of metakaolin and flyash blended high strength with crimped fibers at the age of 28 days. The results are analyzed to make useful conclusions regarding the basic strength properties of the ternary blended concrete with various percentages of fibers.