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The concrete which is generally cast immediately after mixing at the time t=0 i.e. 0-hr concrete is called as fresh concrete and possess highest strength. If the concrete is kept exposed to the open air for certain time lag t and becomes partially set called old concrete. This concrete is unserviceable and does not achieve the target strength, should be discarded. Now if the partially set concrete i.e. t-hr. concrete is mixed with the freshly prepared concrete i.e. t=0. and this composite mass thus, produced may be reused for attaining the target strength or strength relatively lesser to target strength such concrete is termed as blended composite mix. Ideal strength-time variation of blended concretes. The variation of strength against time lag is generally dropping in nature and the improvement in this dropping strength depends upon the blend ratio r. Over laying is a term credited to the mixing of two distinctive individual blends of a similar blend write however of various r and t esteems into a solitary composite mass, which from now on be called as the selfed mass, and the relating quality of which be named as selfed quality.
