Assessment of ZSV in Asphalt Concrete Using Shear Frequency Sweep Testing
Publication: Journal of Materials in Civil Engineering
Volume 24, Issue 10
Abstract
This study elaborates on methods for assessing the material property called zero shear-rate viscosity (ZSV) in asphalt concrete based on shear frequency sweep testing. The purpose of ZSV assessment is for linear viscoelastic permanent deformation modeling. The basic approach was to fit parameters of the Laplace-transformed Burger’s model to the measured shear dynamic modulus data. This method produced multiple solutions, although an approximate measure of the minimum ZSV could be estimated. Therefore, extrapolation was necessary to assess the frequency-independent ZSV based on the measured frequency sweep data. The method was complemented with the simplified Cross extrapolation model that was successfully fitted to the measured data. The extended method also produced multiple solutions, although the minimum ZSV could be assessed unambiguously. The results were in accordance with expectations based on measured dynamic shear modulus and phase angle.
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Acknowledgments
The writers wish to thank Hassan Hakim at the Swedish National Road and Transport Research Institute for his technical support. Further, Richard Nilsson at Skanska Teknik and Monica Berntman at Lund University contributed with some useful advice. The work was funded by the Swedish Transport Administration (formerly Swedish National Road Administration-SNRA) and the Development Fund of the Swedish Construction Industry (SBUF).
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 24 • Issue 10 • October 2012
Pages: 1305 - 1309
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Feb 14, 2011
Accepted: Feb 17, 2012
Published online: Feb 21, 2012
Published in print: Oct 1, 2012
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