Evaluation of microdamage, healing, and heat dissipation of asphalt mixtures, using a dynamic mechanical analyzer

Yong Rak Kim, Dallas N. Little, Robert L. Lytton

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Microdamage accumulation due to fatigue loading, healing due to rest periods, and hysteresis heating during fatigue testing of asphalt mixtures using a dynamic mechanical analyzer were investigated. Specially fabricated sand-asphalt specimens were tested under a repetitive, controlled-strain torsional mode at 25°C and 10 Hz. Fatigue performance was evaluated using hysteresis loops of stress-pseudostrain and a simple parameter, pseudostiffness, based on the elastic-viscoelastic correspondence principle. Heat generation and dissipation during fatigue testing were also investigated by measuring temperature changes of a tiny thermocouple inside the asphalt mixtures. The results demonstrate that microdamage healing due to rest periods results in an increase of fatigue life. It was observed that the effects of hysteresis heating on the changes of stiffness during the fatigue test were not significant. Successful development of this testing method is suggested as a potential specification-type test method because of its rapidity, repeatability, and accuracy.

Original languageEnglish (US)
Pages (from-to)60-66
Number of pages7
JournalTransportation Research Record
Issue number1767
DOIs
StatePublished - Jan 1 2001

Fingerprint

Asphalt mixtures
Heat losses
Fatigue of materials
Fatigue testing
Hysteresis
Heating
Heat generation
Hysteresis loops
Thermocouples
Asphalt
Sand
Stiffness
Specifications
Testing
Temperature

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanical Engineering

Cite this

Evaluation of microdamage, healing, and heat dissipation of asphalt mixtures, using a dynamic mechanical analyzer. / Kim, Yong Rak; Little, Dallas N.; Lytton, Robert L.

In: Transportation Research Record, No. 1767, 01.01.2001, p. 60-66.

Research output: Contribution to journalArticle

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