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Air voids reduction phenomena of asphalt concrete – A continuum approach

Abstract

Asphalt concrete used in flexible highway pavement construction has 5–8 percent air voids immediately after laying of the roadway. Constitutive laws for asphalt concrete developed till now have modelled the mix as a linear elastic or viscoelastic material and have not taken into account the effect of void concentration on the mechanical behaviour of the material. In this paper, the theory of linear elastic material with voids is used to model asphalt concrete under isothermal conditions. Two cases of void reduction behaviour are studied, one in which the void volume reduces asymptotically under a constant load and the other in which it reaches the refusal air void content. The model is used to predict the creep behaviour under constant compressive stress as well as to obtain the hysteretic stress-strain behaviour. Solutions for the case of uniaxial deformation are derived and the strains are simulated for a constant compressive stress. Use of the air voids reduction measure as a possible damage parameter is also examined.

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Krishnan, J.M., Rengaraju, V. Air voids reduction phenomena of asphalt concrete – A continuum approach. International Journal of Fracture 97, 337–354 (1999). https://doi.org/10.1023/A:1018323400995

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  • DOI: https://doi.org/10.1023/A:1018323400995

  • Asphalt concrete
  • air voids reduction
  • theory of linear elastic material with voids
  • creep
  • hysteresis
  • damage parameter.