15-09-2017, 12:53 PM
The special types of concrete are those with properties out of the ordinary or produced by unusual techniques. Concrete is, by definition, a composite material consisting essentially of a bonding medium and aggregate particles, and can take many forms. Special concrete is concrete for special purpose for increased strength and durability for various construction applications. Special concretes are concrete prepared for specific purpose such as light weight, high density, fire protection, radiation shielding etc. concrete is a versatile material that has good compressive strength. But it suffers from many drawbacks such as low tensile strength, liquid permeability, reinforcement corrosion, susceptibility to etching and low durability. Modifications have been made from time to time to overcome the deficiencies of cement concrete. Recent developments in materials and construction technology have led to significant changes that have resulted in improved performance, wider and more economical use.