Shear fatigue behavior of geosynthetic-reinforced asphalt layers

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Abstract
The factors influencing bonding between geosynthetics, and asphalt layers have been extensively investigated through monotonic interface shear tests. However, little is known about how the geosynthetic pavement interlayers behaves under cyclic shear loading. Dynamic shear testing is recognized as more appropriate to understand the performance of pavements under traffic loads. This paper presents the characterization of bond stiffness and shear fatigue life using dynamic interface shear tests on three different geosynthetic-reinforced asphalt interlayers, including a geogrid and two reinforcement geocomposites. Double-layered samples of 150 mm diameter were compacted in the laboratory using Marshall adapted method. The dynamic interlayer shear behavior was evaluated using cyclic Leutner device at a frequency of 5 Hz. The bitumen coating content and thickness of the fabric backing showed to most influence the shear fatigue life of geosynthetic interlayers. This research shows that distinct shear fatigue behaviors were obtained for the different types of geosynthetics.

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