FATIGUE AND HEALING CHARACTERIZATION OF ASPHALT MIXTURES

This paper investigates the effect of the processes on fatigue fracture and fracture healing during controlled-strain, dynamic mechanical analysis (DMA) testing. Sand asphalt samples were fabricated with two SHRP-classified binders: AAD-1 and AAM-1. DMA testing was performed at 25°C and at 10 Hz. The mechanical response during DMA testing was monitored using three different damage indicators: (1) change in dynamic modulus; (2) change in pseudo stiffness; and (3) change in dissipated strain energy. When either of these parameters are plotted versus the number of load cycles, two inflection points are apparent that define a significant change in sample behavior due to damage. The second inflection point is a reasonable definition of failure, as it is strongly correlated with the peak of the plot of phase angle versus load repetitions. Furthermore, the phase angle drops precipitously at the second inflection point. By performing controlled-strain torsional fatigue tests at three different strain levels, each great enough to induce damage, a reproducible fatigue relationship (number of load cycles as a function of stress level) is developed. The introduction of several rest periods during testing lengthened fatigue life. Successful development of this testing method is suggested as a potential specification-type test method because of its efficiency, reproducibility, and reliability.

[1]  Robert L. Lytton,et al.  AN ANALYSIS OF THE MECHANISM OF MICRODAMAGE HEALING BASED ON THE APPLICATION OF MICROMECHANICS FIRST PRINCIPLES OF FRACTURE AND HEALING , 1999 .

[2]  Richard Schapery.  Correspondence principles and a generalizedJ integral for large deformation and fracture analysis of viscoelastic media , 1984 .

[3]  Hussain U Bahia,et al.  NON-LINEAR VISCOELASTIC AND FATIGUE PROPERTIES OF ASPHALT BINDERS , 1999 .

[4]  Mihai O. Marasteanu,et al.  Establishing Linear Viscoelastic Conditions for Asphalt Binders , 2000 .

[5]  R. Christensen.  Theory of viscoelasticity : an introduction , 1971 .

[6]  Didier Martin,et al.  Evaluation of fatigue criteria for asphalt binders. Discussion , 2001 .

[7]  J. Goodrich.  ASPHALT AND POLYMER MODIFIED ASPHALT PROPERTIES RELATED TO THE PERFORMANCE OF ASPHALT CONCRETE MIXES (WITH DISCUSSION) , 1988 .

[8]  G M Rowe,et al.  Performance of asphalt mixtures in the trapezoidal fatigue test , 1993 .

[9]  D W Christensen,et al.  Interpretation of dynamic mechanical test data for paving grade asphalt cements , 1992 .

[10]  D. Little,et al.  ONE-DIMENSIONAL CONSTITUTIVE MODELING OF ASPHALT CONCRETE , 1990 .

[11]  D N Little,et al.  HEALING IN ASPHALT CONCRETE PAVEMENTS: IS IT REAL? , 1994 .

[12]  S. Hesp,et al.  Crack Pinning in Asphalt Mastic and Concrete: Regular Fatigue Studies , 2000 .

[13]  R Reese,et al.  PROPERTIES OF AGED ASPHALT BINDER RELATED TO ASPHALT CONCRETE FATIGUE LIFE , 1997 .

[14]  D. Little,et al.  Fatigue characterization of asphalt concrete using viscoelasticity and continuum damage theory , 1997 .

[15]  R B Leahy,et al.  Validation of SHRP binder specification through mix testing , 1993 .

[16]  J L Goodrich,et al.  Asphaltic binder rheology, asphalt concrete rheology and asphalt concrete mix properties , 1991 .

[17]  Yang H. Huang,et al.  Pavement Analysis and Design , 1997 .

[18]  Y. Kim,et al.  CONTINUUM DAMAGE MECHANICS-BASED FATIGUE MODEL OF ASPHALT CONCRETE , 2000 .

[19]  Mihai O. Marasteanu,et al.  Evaluation of Fatigue Criteria for Asphalt Binders , 2001 .

[20]  Y. Kim,et al.  Correspondence Principle for Characterization of Asphalt Concrete , 1995 .