Forced Convective Drying of Wet Porous Asphalt Imaged with Neutron Radiography

Authors

  • Lily D. Poulikakos,

    Corresponding author
    1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Road Engineering/Sealing Components, Überlandstrasse 129, Dübendorf, Switzerland
    • Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Road Engineering/Sealing Components, Überlandstrasse 129, 8600DübendorfSwitzerland

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  • Saba Saneinejad,

    1. Chair of Building Physics, ETH Zürich, Swiss Federal Institute of Technology Zürich, Wolfgang-Pauli-Strasse 15, Zürich, Switzerland
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  • Marjan Sedighi Gilani,

    1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Building Science and Technology, Überlandstrasse 129, Dübendorf, Switzerland
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  • Iwan Jerjen,

    1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Electronics/Metrology/Reliability, Überlandstrasse 129, Dübendorf, Switzerland
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  • Eberhard Lehmann,

    1. Department of Spallation Neutron Source (ASQ), Paul Scherrer Institute, Villigen, Switzerland
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  • Dominique Derome

    1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Building Science and Technology, Überlandstrasse 129, Dübendorf, Switzerland
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  • The authors would like to thank professors Jan Carmeliet and Manfred Partl for supporting the project. The experiments were carried out at the NEUTRA beamline of the Paul Scherrer Institute, Villigen, Switzerland, the technical support of NEUTRA team, namely Peter Vontobel is greatly appreciated. The contributions and support of the EMPA technicians Stephan Carl, Roger Vonbank and Marcus Erb is acknowledged. Visiting trainee student David Morrice performed the smoke tests and his contribution is gratefully acknowledged.

Abstract

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Characterization of the drying process of porous asphalt (PA) is done using neutron radiography; showing that drying of PA follows two distinct phases with a first more rapid moisture loss followed by a slower moisture loss in presence of disconnected fluid pockets. Moisture content distribution would not be obtainable with traditional methods such as recording the mass versus time.

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