Influence of Crack Depth on Performance of Geosynthetic-Reinforced Asphalt Overlays

Vinay Kumar, V and Sireesh, Saride (2019) Influence of Crack Depth on Performance of Geosynthetic-Reinforced Asphalt Overlays. In: Geotechnics for Transportation Infrastructure. Lecture Notes in Civil Engineering, 29 (29). Springer, Singapore, pp. 181-193. ISBN 9789811367120

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Abstract

The influence of crack depth in the existing pavement layer on the performance of geosynthetic-reinforced asphalt overlays against reflective cracking is evaluated in this study. The two-layered asphalt beam specimens having a crack depth of 40, and 25Â mm in the bottom layer are tested under repeated load four-point bending test to understand the influence of crack depth on the performance of geosynthetic-reinforced asphalt overlays. A digital image analysis technique was incorporated to study the failure modes of unreinforced and geosynthetic-reinforced specimen. Two different types of geosynthetic interlayers, namely woven geo-jute mat (GJ) and a biaxial polypropylene grid with a square aperture size of 40Â mm (PP), are used in the study. The repeated loading tests were conducted on all the specimens under four-point bending configuration in a load-controlled mode at a frequency of 1Â Hz. The performances of reinforced specimens were compared with the unreinforced specimen (CS), and the improvement in fatigue life was estimated. Fatigue test and DIC results indicate that the reinforced specimens improved the fatigue life of overlays, irrespective of crack depth and among them, the performance of PP specimens is superior. A superior performance of geosynthetic interlayers is witnessed at a larger crack depth (40Â mm), irrespective of the interlayer type.

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