Evaluating Four-Point Bend Fatigue of Asphalt Mix Using Image Analysis
Publication: Journal of Materials in Civil Engineering
Volume 16, Issue 1
Abstract
One of the primary structural distress modes found in bituminous pavement layers is fatigue cracking, resulting from repeated application of traffic-induced stresses. The development of a four-point bending test arrangement to determine the dynamic mechanical properties of rectangular beam specimens dimensions) of bituminous mixtures is discussed. This novel system allows the crack-damaged surfaces of beam specimens to be inspected and monitored digitally in situ during fatigue tests. The test fixture, which was integrated with a closed-loop servo hydraulic feedback system, incorporates a constant clamping mechanism and uses a combined displacement and loading mode of control. A series of four-point bending fatigue tests were performed on specimens of two standard Irish mixtures: a hot rolled asphalt and dense base course macadam. The digitally imaged information on fatigue cracking was used to measure the extent of damage and to characterize a linear elastic fracture mechanics model.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 16 • Issue 1 • February 2004
Pages: 60 - 68
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Mar 27, 2002
Accepted: Apr 23, 2003
Published online: Jan 16, 2004
Published in print: Feb 2004
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