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Review Paper on assessment of bond between bituminous pavement layers
Author Name : Ishan Hooda, Mrs. Monika
This paper presents the evaluation of bond between the bituminous pavement layers present in a particular road which is used for the transportation of various heavy load vehicles on it. This paper provides the basic information towards the various capabilities of bitumen functions in a pavement. A bituminous pavement is a multi layered structure, generally made up of surfacing base, base course and sub-grade. The boundary between any two consecutive layers is the layer interface. Tack coat and prime coat is generally applied at the interface. Generally all the layers of bituminous pavement are bonded with each other in proper ratio with equal strength. A bituminous pavement is a multi-layered structure generally made up of surfacing, base and sub base courses on a sub grade. An interface is said to be a boundary between any two consecutive layers. So an adequate bond between the layers at the interfaces must be ensured so that multiple layers perform as a single composite structure. In case of non-bituminous layers or bituminous-non bituminous layers, adequate bond is established as such due to the mechanical interlocking between the aggregate surfaces. However, the state of bond at the interface between any two bituminous layers has a significant influence on the stress distribution across pavement layers under traffic loads and hence on the overall performance of the pavement. To increase the adhesion or bonding between two bituminous layers, bituminous tack coats are applied prior to overlay. This study is an attempt to evaluate the interface bond strength between two types of bituminous layer combinations in the laboratory.