Abstract

In this research, four types of geotextiles were selected and their impact on fatigue life and average flexural stiffness of hot mix asphalt (HMA) specimens was investigated. Fatigue tests were implemented by four-point bending beam test at strain control condition with haversine wave and 10 Hz frequency. The fatigue tests were carried out in four strain levels 250, 400, 650 and 1000 micro strain. Based on test results, the fatigue life of all specimens reinforced by four types of geotextiles was increased, but this increase in specimens of Geot Type 1 and Geot Type 2 was more than that of Iranian ones. Fatigue life was different at various strain levels for any type of geotextile materials and results showed that specimens made of reinforced geotextiles had higher performance at high strain levels. Results also expressed that geotextiles may reduce or increase the average flexural stiffness of specimens but they totally cause the improved quality of the asphalt pavement.

Key words: Fatigue life, geotextiles, bending beam test, strain levels, flexural stiffness.