Theory and practical experiences in pavement rehabilitation using asphalt reinforcement grids
The conventional method for rehabilitation of cracked asphalt pavements is the installation of new asphalt layers. This resurfacing is often not an effective solution, as the existing cracks in the old asphalt layers can rapid propagate to the top of the new overlay. In order to delay the development of reflective cracks, asphalt reinforcement grids have shown outstanding results in addressing the issue of crack propagation, eliminating or delaying the damage caused by water intrusion. Through basic theory and practical experiences this paper will demonstrate the success and extended pavement life that can be achieved by using asphalt reinforcement grids in highway applications. Special attention is given to the performance on site, e.g. the loss of tensile strength due to the paving procedure and the importance of using alkali-resistant materials when in direct contact with concrete or cement stabilized materials. The increased pavement life achieved by the use of this technology not only prevents excessive disruption to traffic flow and local business, but it also demonstrates strong environmental and economic benefits.
Reflective cracking can occur in cracked pavements rehabilitated with a simple asphalt overlay. To delay the development of reflective cracks, an asphalt reinforcement grid can be placed before the new asphalt wearing course. In order to choose the proper product for a road rehabilitation, construction conditions and material characteristics must be chosen taking into account.
The presented case studies have showed that the use of an asphalt reinforcement in pavement rehabilitation can be advantageous. Based on the observed performance, it is possible to conclude that the asphalt reinforcement is an effective treatment against reflective cracking in asphalt overlays, resulting in an extension of the service life of a rehabilitated pavement.