Study of the Properties of Concrete by using Portland Pozzolona Cement and Ultra Fine Slag at Different Age of Curing

Abstract

In Indian iron and steel industry Blast furnace slag is discharged as waste . The recycling of these slag’s will become an important measure for the environmental protection. Iron and steel are basic materials in present day world. Slag which was regarded as waste has now found its application in various sectors thus helping in safe-guarding the environment due to many years of research. Slag has some quality and properties that are difficult to find in natural materials. The primary constituents of slag are lime (CaO) and silica (SiO2). Portland cement also contains these constituents. Slag is soluble in water and exhibits an alkalinity like that of cement or concrete. Ground Granulated Blast Furnace Slag (GGBS) and Ultra Fine Ground Granulated Blast Furnace Slag (UFGGBS) are a by-product from the manufacture of pig iron and obtained through rapid cooling by water or quenching molten slag. Here the molten slag is produced which is instantaneously tapped and quenched by water. This rapid quenching of molten slag facilitates formation of Granulated slag. Ground Granulated Blast furnace Slag (GGBS) is processed from Granulated slag and Further Ground Granulated Blast furnace Slag (GGBS) is granulated into Ultra Fine Ground Granulated Blast Furnace Slag (UFGGBS) by grinding mills. UFGGBS essentially consists of silicates and alumina silicates of calcium and other bases that are developed in a molten condition simultaneously with iron in a blast furnace. The chemical composition of in UFGGBS is similar to that of Portland cement but the proportion varies. Use of industrial wastes and byproducts as an aggregate or raw material is of great practical significance for environment