Concrete

what is concrete? concrete grade, Prestressed concrete, mass concrete Concrete is a mixture of Portland cement, water, and coarse and fine aggregates. It consolidates into a hard mas because of a chemical reaction called hydration between cement and water. Proportioning a concrete mix for a given purpose is thus the art of obtaining a suitable ratio of the various ingredients of concrete with the required properties at the lowest cost. Table of contant what is concrete design mix concrete prestressed concrete mass concrete Concrete is generally graded according to its compressive strength. In the designation of concrete mix, the letter M refers to the mix and the number is the specified characteristic strength of 150 mm work cubes at 28 days, expressed in MPa (N/mm²). Concrete is a construction material composed of cement, fine aggregates (sand) and coarse aggregates mixed with water which hardens with time. Portland cement is the commonly used type of cement for the