Red mud is an industrial waste material generated during production of alumina from bauxite by Bayer Process.  These Industrial waste hold some heavy aim of the paper is to study the compressive strength according to the age of the concrete structure using ultrasonic pulse velocity method. If the correlation between the ultrasonic pulse velocity and compressive strength according to the age is derived the compressive strength of early age of the concrete structure can be estimated at the new construction site and the compressive strength of the existing structure can be estimated at the remodeling construction site.  The estimation equation confirmed that it is possible to estimate the compressive strength of concrete according to its age using nondestructive test methods.

Index terms: Alkali – activated slag cement, Compressive strength test, Red mud, Split tensile test, Ultra pulse velocity.