Comparative analysis of interlayer bonding behaviour of different types of pavement interfaces

Abstract

The rehabilitation of flexible pavements aims the recovery of its characteristics and is usually accomplished either by the application of additional bituminous mixtures (reinforcement), or by removing the layers whose function is compromised and subsequent placement of new bituminous layers, seeking to increase load capacity, serviceability and extend its life cycle. The bonding between the applied layers is one of the key aspects in pavements performance, reflecting the capability of pavements to work as a whole. A comparative study of the behaviour of the interface between the bituminous top layer and an underlying layer by applying different reinforcement elements has been developed. In order to evaluate the interface bonding behaviour for national conditions, namely in what concerns the type of actions, applied materials and construction techniques, a laboratory study was made with destructive tests such us pull-of test and shear type test allowing the proposition of reference values.