Impact of geometric and performance grade properties of hot mix asphalt de-bonding layer on performance of unbonded jointed plain concrete overlay

Gauhar Sabih, Rafiqul A. Tarefder

In the proceedings of: GeoOttawa 2017: 70th Canadian Geotechnical Conference; 12th joint with IAH-CNC

Session: Transportation Geotechnics III - Roads B

ABSTRACT: Rehabilitation of existing jointed plain concrete pavements (JPCP) by using unbonded concrete overlay is being overly used worldwide. It is a layer of concrete placed over an existing JPCP with a hot mix asphalt (HMA) interlayer. The purpose of the interlayer is to separate the existing and overlay concrete layers and reduction of reflection cracking. This study focuses on the impact of thickness and superpave performance grade properties of HMA separation layer on performance of concrete overlays. Simulations were conducted using ME design software with varying thickness of the separation layer. The results indicated that with decrease in the thickness of the HMA layer, the performance of unbonded overlay is adversely affected with increased transverse cracking, whereas no significant effect was observed on joint faulting. The impact of variation in superpave performance binder grade on the overlay performance was also analyzed, and no significant effect was observed.

RÉSUMÉ: La réhabilitation des chaussées articulées en béton ordinaire (JPCP) à de revêtement de béton non adhérants est de plus en plus utilisée dans le monde entier. une couche de béton placée au-dessus JPCP existant, avec une couche intermediaire à chaud (HMA). Le but de cette couche intermediaire (intercalaire) est de séparer la nouvelle couche de ainsi que de reduire la remontée de fissures. Cette étude met sur de aisseur et les propriétés du superpave sa comme couche de séparation HMA sur la performance du béton de revêtement s. Des simulations ont été effectuées en utilisant le logiciel de conception ME en variant de la couche de séparation. Les résultats ont indiqué que la reduction de de la couche HMA la performance du recouvrement non-adherants est negativement affectee avec fissuration transversale accrue alors effet significatif a été observé sur la rupture de joints. de la variation de la qualité du liant superpave sur la performance du recouvrement a été également analysé et aucun effet significatif a été observé.

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Cite this article:
Gauhar Sabih; Rafiqul A. Tarefder (2017) Impact of geometric and performance grade properties of hot mix asphalt de-bonding layer on performance of unbonded jointed plain concrete overlay in GEO2017. Ottawa, Ontario: Canadian Geotechnical Society.

@article{geo2017Paper264,author = Gauhar Sabih; Rafiqul A. Tarefder,title = Impact of geometric and performance grade properties of hot mix asphalt de-bonding layer on performance of unbonded jointed plain concrete overlay,year = 2017}