Damage analysis in asphalt concrete mixtures based on parameter relationships

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Title: Damage analysis in asphalt concrete mixtures based on parameter relationships
Author: Song, Injun
Abstract: Asphalt pavements experience damage due to traffic loading under various environmental conditions . Damage can be caused by viscopl microcracks , fracture due to fatigue cracking , or fracture due to thermal cracking . Asphalt pavements have the capability to remedi s damage depending on binder surface and rheological properties , filler surface properties , and length of rest periods . Asphalt mastic (asphalt and fine aggregates ) properties play an important role in controlling damage and healing . This dissertation development of a comprehensive methodology to characterize damage and healing in asphalt mastics and mixtures . The methodology reli ctive imaging techniques (X -ray CT ) , principles of continuum damage mechanics , and principles of micromechanics . The X -ray CT yield meter that quantifies the percentage of cracks and air voids in a specimen . The continuum damage model parameters are derived from p between applied stress and pseudo strain . The micromechanics model relates the damaged mastic modulus to a reference undamaged mo ationship is a function of internal structure properties (void size , film thickness , and percentage of voids ) , binder modulus , aggr and bond energy between binder and aggregates . The internal structure parameters are all obtained using X -ray CT and correlated . The developed methodology was used to characterize damage in asphalt mastic and mixture specimens tested using the Dynamic Mechanic A ) and dynamic creep test . The damage parameter measured using X -ray CT correlated very well with the predictions of the continuum ics models . All damage parameters were able to reflect the accumulation of damage under cyclic loading and were also able to captur of moisture conditioning on damage . Although this dissertation focused on fatigue cracking at room temperatures , the methodology d used to assess damage due to different mechanisms such as permanent deformation and low temperature cracking .
URI: http : / /hdl .handle .net /1969 .1 /1300
Date: 2004-11-15

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Damage analysis in asphalt concrete mixtures based on parameter relationships. Available electronically from http : / /hdl .handle .net /1969 .1 /1300 .

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