Geogrids are used to reinforced and stabilise the roads and improve the bearing capacity of pavements on soft subgrades. Additionally, geogrids installed within granular layer of a pavement formation are frequently used to control environmental distress and limit longitudinal cracking due to expansive subgrades by providing the stiffening, known as the new function of geosynthetic material to control deformations in the soil-geosynthetic composite. This presentation reviews the issues with expansive subgrades and presents the sustainable solution to control the cracks by using geogrid reinforcement. It covers the research and field monitoring results and full scale trials during last 20 years including the very recent full scale field trial in Australia. An analysis of the first 5 years of monitoring of this full-scale field trial including crack measurement and FWD tests will be presented. The results demonstrate that greater control of cracking has been initially achieved in the test sections where geo-reinforcement was installed. The presentation also covers the important design parameters and construction considerations based on the latest international and local test results and field trials.
Civil Composites For Resilient And Sustainable Transport Infrastructure
Research and development of engineered composite materials and structures in the last two decades have paved way to increasing applications of these advanced materials in