Effect of Different Types of Coarse Aggregates on Physical Properties of Mostly Used Grades M20, M25, M30 of Concrete

Abstract

Aggregates are inert granular materials such as sand, gravel, or crushed stone that, along with water and binder (cement/blended cement), are an essential ingredient in concrete. For a good concrete mix, aggregates need to be clean, hard, strong particles free of absorbed chemicals or coatings of clay and other fine materials that could cause the deterioration of concrete with required shape and size. Aggregates, which account for 60 to 75 percent of the total volume of concrete, are divided into two distinct categories-fine and coarse. The most important property of concrete is its compressive strength. For the purpose of comparison of such compressive strength, three types of coarse aggregates, quartzite, Granite and river gravel were use. The fine aggregate is normal sand obtained from a borrow pit. This experimental investigation describe the influence of aggregate type and size on concrete density compressive and split tensile strength of concrete. Three different type of coarse aggregates used for developing mix design. The size of coarse aggregate of 40mm, 20mm, 12mm. OPC is intended to be used as binding material and tests are carried out after 7 and 28 days.