• 03 juli 2017

    Innovative construction techniques and functional verification on airfield pavements—a Dutch case study

    Onderwerp Asfalt
    Auteur(s) F.R. Bijleveld, A.H. de Bondt, R. Khedoe
    Gepubliceerd Bearing Capacity of Roads, Railways and Airfields
    Omschrijving There is a push for improving the on-site pavement construction process. In addition, agencies change their specifications towards functional requirements and increase their guarantee periods. However, there is a gap between the tests in the laboratory design phase (CE-marking) and the properties achieved in the field. Also, the on-site construction process is traditionally not routinely monitored. This makes it hard to relate field properties to properties used in the design and properties declared on the CE-marking. This research addresses this gap as well as the need for a better understanding of the on-site construction processes. In the Dutch airfield construction project Rotterdam The Hague Airport, mechanical properties (indirect tensile cracking resistance and triaxial permanent deformation resistance) were determined on (a) laboratory-mixed, laboratory-compacted specimens, (b) plant-mixed, laboratory-compacted specimens, and (c) plant-mixed, field-compacted specimens. Using this methodology, functional verification became possible and it allowed directly comparing field properties with properties promised in the pavement design and declared on the CE-mark. Additionally, supporting technologies were successfully introduced, such as GPS, laserlinescanners and infrared cameras, to monitor the asphalt temperature variability and the number of roller passes. The results made the on-site process explicit and show a consistent and homogeneous process. The paper demonstrates that the fracture energy of the CE-marking specimens are a pretty good estimator for the final fracture energy achieved in the field. Further, the paper demonstrates how technologies can be used to monitor the on-site construction process. Together, this contributes to a deeper understanding of the construction process, consistent asphalt quality and functionally verified field properties.