Bituminous materials, a by-product of the oil distillation process, look set to remain as a consti- tuent material of road paving for some considerable time to come, being used to withstand the flexural and compressive stresses caused by traffic hence the main area of usage of bituminous mixtures is in road construction.

The title of bituminous mixtures is called Asphalt in USA. Bituminous mixtures consist of essentially two ingredients, aggregate and binder. The major difference between asphalt and concrete is that bitumen and bituminous materials are used as binder in asphalt.