Experimental study of the fatigue behavior of asphalt binder and mixture containing nanoclay through Time-Sweep, Strain- Sweep and bending beam methods

Articles in Press

Document Type : Scientific - Research

Authors

1 Department of Civil Engineering, Savadkouh Branch, Islamic Azad University, Savadkouh, I. R. Iran.

2 Assistant Professor, Department of Civil Engineering, University of Science and Technology of Mazandaran, Behshahr, Iran

3 Department of Civil Engineering, Ayatollah Amoli Branch, Islamic Azad university, Amol, Iran

Abstract

Fatigue resistance of an asphalt mixture is the ability of the mixture to withstand repeated bending loads without failure. The purpose of this research is to investigate the fatigue behavior of asphalt mixtures containing limestone, granite and clay nano additives. In this study, the bitumen used in this research is 60/70, and nano additives were added to the bitumen in the amount of 0, 3 and 6% by weight. In this research, the time sweep test was performed at strains of 2, 3.5 and 5% using a dynamic shear rheometer test. The strain sweep test was also performed to evaluate the linear and non-linear properties of bitumen. The modulus of elasticity and indirect tensile test were also performed on asphalt concrete samples. Four-point bending fatigue test was conducted to investigate the fatigue behavior of asphalt mixtures. The loading strain levels used in this research include 400, 600 and 800 microstrain. Also, all fatigue tests were performed at two average temperatures of 15 and 25 degrees Celsius. The results showed that by adding nanomaterials to bitumen, the linear viscoelastic limit decreased with an increase in shear modulus. The results show that; Adding nanoclay to bitumen and asphalt mixture increases the fatigue life of asphalt samples at all strain levels. Also, increasing the test temperature from 15 to 25 °C increases the fatigue life of asphalt mixtures.

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Quarterly Journal of Transportation Engineering

Articles in Press, Accepted Manuscript
Available Online from 07 May 2024

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History

  • Receive Date: 16 February 2024
  • Revise Date: 27 April 2024
  • Accept Date: 30 April 2024

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