Effect of Loading and Temperature on Dynamic Modulus of Hot Mix Asphalt Tested under MMLS3

In this study, the accelerated loading equipment MMLS3, which applies scaled wheel load on a scaled pavement structure, has been used to investigate the effect of loading and temperature on the dynamic modulus (|E*|) of hot mix asphalt (HMA). Several HMA test slabs have been prepared in the laboratory by compacting mixes using vibratory roller compactor. The test slabs, instrumented with strain gauges and thermocouples, have been subjected to repeated wheel load using MMLS3 under controlled temperature condition. The strain and temperature data have been acquired continuously during loading with data acquisition system. The analysis of data indicated that strain signals are composed of several dominant frequencies. The constitutive equation of linear viscoelasticity in time domain was then transformed to frequency domain using the Fast Fourier Transform technique at steady state condition and the complex |E*| values have been determined continuously during the loading. The test results indicated that |E*| is significantly affected by the combined effect of loading and temperature. A general trend of reduction of |E*| values due to these factors has been observed in the study. A simple model has been proposed which can be used to determine |E*| under moving wheel load and varying temperature condition. A comparison of test result with the mechanistic-empirical pavement design guide (MEPDG) model of dynamic modulus indicates that the MEPDG model represents the condition at the beginning of loading when the damage is minimal.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References;
  • Pagination: pp 267-278
  • Monograph Title: Airfield and Highway Pavements. Efficient Pavements Supporting Transportation's Future

Subject/Index Terms

Filing Info

  • Accession Number: 01144397
  • Record Type: Publication
  • ISBN: 9780784410059
  • Files: TRIS
  • Created Date: Nov 12 2009 10:58AM