Use of APT for validating the efficiency of reinforcement grids in asphalt pavements

Abstract

Reinforcement of flexible asphalt pavements with interlayer systems containing grids is increasingly used to extend service life of roads. Typically, reinforcements are placed between layers. They can be utilized to prevent the propagation of reflective cracking, prolonging the service life of asphalt pavements. Many research and practical experiences have shown the advantages of using reinforcements to increase the life-span of a pavement. However, only few tests were done using Accelerated Paving Testing (APT), where the application of loads is carried out with controlled passing of truck tires. Further, there is still insufficient research carried out to predict the actual effect on the extension of the pavement's life-span. This information is critical for pavement design purposes and to improve the design standards. This research focuses on the effect of different reinforcement systems on the life-span extension of two-layered slabs and an asphalt pavement, using scaled and full scale APT with the Model Mobile Load Simulator MMLS3 and the Mobile Load Simulator MLS10 respectively. Laboratory and full-scale results with MMLS3 and MLS10 show that the different grids used in the test will extend the life-span of the tested pavements up to two times. The full-scale tests show, that the effect of the construction of a reinforcement system combining a grid with a stress absorbing membrane (SAMI) with the grid, increases the rutting of the pavement.