United States Department of Transportation
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Microdamage healing in asphalt and asphalt concrete, volume 3 : a micromechanics fracture and healing model for asphalt concrete.
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2001-06-01
[PDF-4.91 MB]
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Edition:Final; Feb. 1998.
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;
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Abstract:Volume 3 documents the development of a micromechanics fracture and healing model for asphalt
concrete. This model can be used to calculate the density and growth of microcracks during repeated direct
tensile controlled-strain loading. The model is based on a relationship among stiffness changes in the mixture as
damage occurs, the rate of change in dissipated pseudo strain energy as loading are applied to the samples and
as damage occurs and mixture properties including crack length changes upon loading and mixture cohesive
surface energies. The report demonstrates that microcrack growth is the dominate mode of distress at
temperatures below 25C and that microcrack healing is the dominate mode of recovery of dissipated pseudo
strain energy at these test temperatures. However, at temperatures above about 25C, the predominate mode of
distress is plastic damage. Cracking rates during fatigue damage are related to de-wetting cohesive surface
energy measurements of the bitumen whereas microcracking healing rates are related to wetting cohesive surface
energy measurements of the bitumen. Surface energies of five bitumens with widely different chemical
compositions were found to correlate strongly with healing properties as defined by viscoelastic fracture and
healing theory.
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