The book is about the effect of Tyre rubber on various properties of fresh and hardened concrete. Later effect of surface treatment of rubber on the properties of rubber-based concrete has also been investigated. This experimental work investigates the impact of substituting part of the conventionalaggregates with rubber aggregates on certain characteristics of the cement concretes. The incorporation of rubber aggregates resulting from cutting worn tyres in practical sizes decreases the mechanical resistances of the concretes while improving slightly the fluidity of the tested mixtures. The effect of these aggregates on the shrinkage of the concretes at an early age is appreciable and even very interesting for the concretes used, for example, in road construction. This technique of cutting worn tyres without any further treatment makes it accessible to everyone which helps not only in saving the environment by getting rid of this cumbersome waste but also in saving traditional aggregates.