Interlaying bonding in modern design

摘要

All current design protocols make the assumption that the full road structure acts as a single unit, i.e. all the individual layers are bonded together - the so-called monolithic structure. If there is a weakness in any of these interlayer bonds, the design assumptions about the way the pavement dissipates the stresses are no longer viable. Dr Stephen Tweed, pavement engineer at the Department for Infrastructure (Dfl) Roads, Northern Ireland (Nl). states: In recognition of the importance on interlayer bonding within pavement structures, the application of bond coat in conjunction with each bituminous layer installed is a current requirement within Nl road surfacing contracts. 'Effective bonding between pavement layers is regarded as a key element in providing more durable, longer lasting assets with lower maintenance requirements, reducing the risk of premature failure resulting from layer delamination or water ingress into the pavement structure. The use of high-quality bond coat, between each pavement layer, is considered a fundamental requirement for the delivery of more sustainable pavements with increased service life and whole life value.'