Evaluating Four-Point Bend Fatigue of Asphalt Mix Using Image Analysis

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Title: Evaluating Four-Point Bend Fatigue of Asphalt Mix Using Image Analysis
Authors: Hartman, Anton M.
Gilchrist, M. D.
Permanent link: http://hdl.handle.net/10197/4668
Date: Feb-2004
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 (305×45×50mm 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.
Type of material: Journal Article
Publisher: American Society of Civil Engineers
Copyright (published version): 2004 American Society of Civil Engineers
Keywords: AsphaltFatigueFracture mechanicsFailure (mechanical)MixingHydraulic systemsCracks
DOI: 10.1061/(ASCE)0899-1561(2004)16:1(60)
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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