The effect of loading rate on fracture energy of asphalt mixture at intermediate temperatures and under different loading modes

M.R.M. Aliha; M. Fakhri; E. Haghighat Kharrazi; F. Berto

doi:10.3221/IGF-ESIS.43.09

The effect of loading rate on fracture energy of asphalt mixture at intermediate temperatures and under different loading modes

Authors

M.R.M. Aliha Welding and Joining Research Center, School of Industrial Engineering, Iran University of Science and Technology (IUST), Iran
M. Fakhri Department of Civil Engineering, KN.Toosi University of Technology (KNTU), Tehran, Iran
E. Haghighat Kharrazi Department of Civil Engineering, KN.Toosi University of Technology (KNTU), Tehran, Iran
F. Berto Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), Richard Birkelands vei 2b, 7491 Trondheim, Norway

DOI:

https://doi.org/10.3221/IGF-ESIS.43.09

Keywords:

Asphalt mixtures, Loading rate effect, Fracture energy, Temperature effect, Air void effect, Mixed mode I/II loading

Abstract

At intermediate service temperatures hot mix asphalt (HMA) concretely are subjected to different loading rates due to movement of vehicles which can significantly affect their mechanical characteristics and final service load. Hence, in this paper the effect of loading rate on intermediate temperature fracture resistance of HMA materials is investigated experimentally in different modes of cracking. Different hot mix asphalt mixtures made of various compositions were subjected to asymmetric threepoint bend loading in the form of edge cracked semi-circular bend (SCB) specimens. The effect of aggregate type and air void were studied on the fracture energy values for three mode mixities (including pure mode I, mixed mode I/II and pure mode II) and at different temperatures of 5°C, 15°C and 25°C. Trends of change in fracture energy values revealed noticeable influence of loading rate on the low and intermediate temperature cracking behavior of tested asphalt mixtures with different air void contents and aggregate types subjected to mixed mode I/II loading. Also, a change observed in fracture resistance of asphalt mixtures at nearly zero (5°C) and intermediate temperatures (25°C) that was due to change in the behavior of bitumen from elastic to viscoelastic.

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Published

29-12-2017

Issue

Vol. 12 No. 43 (2018): January 2018

Section

Miscellanea

License

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Authors are allowed to retain both the copyright and the publishing rights of their articles without restrictions.

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How to Cite

The effect of loading rate on fracture energy of asphalt mixture at intermediate temperatures and under different loading modes. (2017). Frattura Ed Integrità Strutturale, 12(43), Pages 113-132. https://doi.org/10.3221/IGF-ESIS.43.09