Flexible pavements are multi-layered structures. The bond strength between these multi-layers is as much important as the strength and stiffness of the individual layers in controlling the life of these pavements. The repeated loading and the varying climatic conditions cause the cracks and joints in the existing pavement to reflect the overlay over a period of time. This phenomenon is called reflective cracking. Insufficient bonding between the layers of the hot mix asphalt (HMA) is one of the reasons for the early appearance of the reflective cracks. Many interlayer systems are introduced to retard the crack propagation, out of which geosynthetic interlayer system has gained attention due to the ease of installa-tion and cost effectiveness. The index properties of natural geotextiles like coir and jute are found to meet the specifications for paving fabric by different standard organizations. This paper focuses on the study of the interface bond strength of natural geotextiles in asphaltic concrete layers by conducting shear tests. The results are compared with those of unreinforced samples to quantify the influence of the reinforce-ment layers. It has been observed that in most cases the jute and coir geotextile-reinforced samples reduc-es the bond strength by 37% and 14% respectively while the synthetic counterpart improves the shear strength by 26% compared with unreinforced samples.
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