EARLY HIGH STRENGTH CONCRETE OF GRADE M 50 WITH PARTIAL REPLACEMENT OF CEMENT BY GGBS &ALCCOFINE AND USING CONPLAST NC ADMIXTURE

Abstract

The exponential growth in infrastructure around the world has become a challenge to the construction field as concrete requires a specified time for achieving the complete strength. In this project, it is endeavored to attain the early high strength using Conplast NC, Alccofine and Grind Granulated Blast Furnace Slag in a less period of time than usual. Early high strength is obtained by partially replacing cement with Alccofine and GGBS, and water with Conplast NC for M50 grade concrete. GGBS is replaced at a rate of 15%, 25%, 35% & 45% and keeping Alccofine 5% constant. To assess the mechanical properties and durability aspects in concrete specimens like cubes, cylinders and beams of a standard size and shape as commended by the Indian norms are casted, cured and tested for 24 hrs, 36 hrs, 48hrs, 60 hrs, 72 hrs, 7days, 28 days, 56 days and 90 days for compressive strength parameters and, 7days and 28 days tests are carried out for flexural and tensile strengths of concrete. After 28 days of curing, the cubes are immersed in acids of sulphate and chloride solutions for durability tests.