Performance of geosynthetics in unpaved roads

This paper presents results of field studies on unpaved low volume roads constructed over weak subgrade using geosynthetic reinforcement. The relative advantages of placing different reinforcing materials like geotextile, biaxial or uniaxial geogrid, geocell layer and tire shreds at the interface of subgrade and base course are studied in terms of increase in load carrying capacity and reduction in rut depth. The rut depths measured in three different test sections when subjected to moving vehicle load simulated by the passage of a scooter on the road at uniform speed for a maximum of 250 passes are compared to understand the relative efficiency of each of these reinforcing materials in reducing the rut formation in unpaved roads. Traffic benefit ratios were also compared for different reinforced test sections.