Longterm performance of the interlayer bond - relation between value after construction and long term performance (VSS2005/503)
Overview
Background & policy context:
In 1999 the research project FA12/94 "Methods to determine the adhesion between pavement layers" has been accomplished. It was found that the shear test according to Leutner was a suitable method to characterise interlayer and in-layer shear properties of asphalt pavements. For pavements with asphalt concrete and SMA wearing courses a value of 21kN was proposed as a requirement immediately after construction. However, since it was not within the scope of that project, the study could not provide information on long-term adhesion properties. The new project is intended to fill that gap by re-evaluating the still existing sections after 10 years of operation.
Objectives:
Goal of the project is the quantitative determination of the development of interlayer adhesion in asphalt pavements during service in order to establish a relationship between test results immediately after construction (contract values) and the adhesion properties during operation (after exposure of the road to traffic and climate). The investigation deals with the properties between and within the wheel tracks.
Methodology:
The examination of the layered composite is carried out as early as the research FA 12/94 using the Shearing test Leutner. Based on changes in the FA 12/94 investigation and the testing of the Swiss standard SN 640 961 while a test temperature is chosen from 25 ° C.
Examines each 5 from the wheel track (trafficked area) and 5 from marginal areas (non-moving energy range) are tested and averaged extracted cores.
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