Journal of Engineering Sciences

Author(s): Islam M. R., Wollega E.

Affiliation(s): Colorado State University, 2200, Bonforte Blvd, Pueblo, CO 81001, USA

^*Corresponding Author’s Address: [email protected]

Issue: Volume 9, Issue 1 (2022)

Dates:
Submitted: March 11, 2022
Accepted for publication: June 9, 2022
Available online: June 13, 2022

Citation:
Islam M. R., Wollega E. (2022). Effect of loading frequency and temperature on the fatigue parameters of asphalt concrete. Journal of Engineering Sciences, Vol. 9(1), pp. D1-D5, doi: 10.21272/jes.2022.9(1).d1

DOI: 10.21272/jes.2022.9(1).d1

Research Area:  MECHANICAL ENGINEERING: Dynamics and Strength of Machines

Abstract. Investigating the behavior of asphalt concrete at low loading frequency is essential to understand the thermal fatigue damage due to cyclic day-night temperature cycles, where the loading frequency is usually very low. This study determines some properties (e.g., fatigue damage, dissipated energy, and stiffness) of asphalt concrete beam samples at a low frequency of loading using four-point bending test apparatus. Results show that fatigue damage is more significant at a lower frequency of cyclic loading and the number of cycles at failure becomes stable at a frequency equal to or lower than 0.01 Hz. The concept of initial stiffness at the 50th cycle of loading is inappropriate at a low frequency of loading as the stiffness reduction with a number of loadings is so considerable at a frequency of loading. In addition, the dissipated energy per loading cycle decreases with a decrease in loading frequency.

Keywords: asphalt concrete, fatigue life, initial stiffness, frequency, temperature.

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