Evaluation of Flexural Fatigue Behavior of Two Layered Asphalt Beams with Geosynthetic Interlayers Using Digital Image Correlation

Saride, Sireesh and V, Vinay Kumar (2017) Evaluation of Flexural Fatigue Behavior of Two Layered Asphalt Beams with Geosynthetic Interlayers Using Digital Image Correlation. In: Transportation Research Board 96th Annual Meeting, Washington, DC United States.

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Abstract

In the current study, the flexural fatigue performance of two layered asphalt beams with and without geosynthetic interlayers has been evaluated using digital image correlation (DIC) technique. The two layered asphalt specimens consist of an old deteriorated pavement slab as the bottom layer, a conventional tack coat along with geosynthetic interlayers and a bituminous concrete (BC) mix compacted as an overlay. The digital images are recorded at a specific interval of load cycles during flexural fatigue testing (four point bending) using a high definition digital camera. The displacement fields obtained from the digital images are analyzed to provide an information on the crack width, crack height and the tensile strains to study the crack initiation and crack propagation stages of beam specimens. The deformation data obtained from the DIC analysis is validated with the vertical deformations measured during the fatigue testing. The results correlate well with an acceptable level of accuracy. The DIC data depicted that the tensile strains are as high as 4.75% at the crack tip in the control specimen at 335 load cycles against 1.42% in a polyester grid interlayered specimen at 13116 cycles

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