Effect of chloride & sulphate attack on high strength concrete with elevated temperature

Now a day's High-Performance concrete (HPC) is widely used throughout the world. Super-plasticizers and different kinds of cement replacement materials are used in these concretes to achieve the required workability. Today concrete has been used with an increased strength and durability in connection with the developments in technology in pre-stressed concrete, concrete and reinforced concrete structures which are sometimes exposed to fires and many structures get damaged and out of use. These studies are very useful for the design of special concrete structures subjected to elevated temperatures such as thermal shielding for nuclear reactors, metallurgical and chemical industries, runways etc. As it is known, high temperatures caused as a result of fire decreases the concrete strength and durability of such structures. The most important design parameter for concrete structures is compressive strength. This critical parameter drives the design process and can influence the cost of a project. Through the use of certain mineral admixtures, the cost of concrete can be reduced. These admixtures also enhance the properties of mortar or concrete.