Unbonded concrete overlay

Unbonded concrete overlays are a type of concrete overlay that are used to restore structural capacity to an existing pavement that is moderately to significantly deteriorated. They are used as a minor or major rehabilitation strategy. As opposed to bonded overlays, unbonded overlays are not bonded to the existing pavement structure and instead use it as a stabilized base. When the existing structure is an asphalt or composite pavement, partial or full bonding between the overlay and existing surface will not cause any problems. If an unbonded overlay bonds to a concrete pavement, the bonding can stress the overlay and result in reflective