The newfangled concept of using concrete overlays are worldwide used for reviving or renovating surfaces of concrete infrastructure which in sequel has proved potent involuntary outcomes for a decade. Various cementitious composites has bespeak high strength and superior durability characteristics to conventional overlay material maintaining a good mechanical bond between the substrate(existing) and overlay(new). Along with further studies, comprehensive equations from codes have shown

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... ble result used for predicting average crack spacing with multilayered reinforced components. Addition to this we see delay in concreting for reasons like improper casting sequence can result in cold joints and cause the executed construction joint limit the successive concrete placement and adversely affect the structure. This experiment is done to study the behavior of bond strength and evaluate properties like ability of deformation i.e. displacement coreponding to given load under four point bending between the interface of RC beam substrate and overlay and calculate the flexural strength, cracking pattern because of the influence of neutral axis depth. It illustrates how the substrate bond restraint affects the surface stress and contributes early age surface crack in bonded concrete overlays under flexure. CE Database subject heading: Bonded concrete overlay, Substrate, flexure load, Cold Joint, De-bonding. Research significance: It is essential to represent loading histories to quantify performance which are prevalent for performance based seismic design as an alternative to routine code design.