Research results from some previous studies shows a consequence of Austroads’ design guides inability to recognise the benefit of geogrid reinforcement and enhanced stiffness of the stabilized aggregate layer with a geogrid. The current Austroads empirical design charts cannot be used to design a geogrid reinforced/stabilised pavements. This presentation reviews the different approached to use geogrid within the Australian design methodologies and presents the modification in the current empirical design charts to consider geogrid reinforcement into the design. A modified version of the charts will be introduced for geogrid reinforced pavements, which have been developed by using a Mechanistic-Empirical (ME) approach. The details of the ME approach and the steps for developing the charts and design examples will be presented. The charts have been verified through large scale cyclic load test with Australian gravel, which will be presented in the paper.
Road Safety and Vehicle Technology Initiatives
The following road safety and vehicle technology research projects and trials have been undertaken in recent years through the road construction industry in conjunction with