Evaluation of fatigue and rutting characteristics of bitumens containing Warm additives

Document Type : Research Paper

Authors

1 Professor, Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.

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

3 PhD Student, Civil and Environmental Engineering Department, Amirkabir University of Technology, Tehran, Iran

Abstract

In order to reduce fuel consumption and CO2 emission in producing and paving asphalt concrete, the warm technology has gained a lot of interests in the recent years in academia and/or industry. In this research study, three warm additives (Sasobit, Rheofalt, and Zycotherm) were used to modify original binder (60-70 penetration grade. (The test data are used to assess the stress sensitivity of asphalt binders at different percentages of additives. The binder fatigue and rutting performance was evaluated through Linear Amplitude Sweep (LAS) and multiple stress creep and recovery (MSCR) test, respectively. The multiple stress creep and recovery (MSCR) test was used to determine the percent recoveries (R), the non-recoverable compliances (Jnr) and the percent differences in non-recoverable compliances (Jnr-diff) of these modified asphalt binders. Results indicated that 3% Sasobit modified binder has the highest percent recovery value and the lowest Jnr value, but had the highest sensitivity to a sudden increase in the stress level inside the asphalt mixture. Unlike the other asphalt binders, the rheofalt and zycotherm modified binders showed small increases in R and slight decreases in Jnr at 64°C temperature. The LAS test results demonstrated that for low strain levels, the fatigue behavior of asphalt binders modified with 1% Sasobit, is the highest one. However, for high strain levels, the 2% Rheofalt had a better fatigue behavior than the other modified binders.

Keywords

References

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History

  • Receive Date: 10 September 2015
  • Revise Date: 06 January 2016
  • Accept Date: 21 March 2017

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