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:||Asphalt;Fatigue;Fracture mechanics;Failure (mechanical);Mixing;Hydraulic systems;Cracks||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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