An Experimental Investigation on usage of Geogrids in Flexible pavement Design

An Experimental Investigation on usage of Geogrids in Flexible pavement Design

Vivek Kumar 1, Mithun Kumar Rana2, Pushpendra Kumar Kushwaha3

1M. Tech. Research Scholar, Civil Department, RKDF College of Engineering, Bhopal (M. P.),402026 India

2Assistant Professor, Civil Department, RKDF College of Engineering, Bhopal (M. P.), 402026  India

3Assistant Professor, Civil Department, RKDF College of Engineering, Bhopal (M. P.), 402026 India

ABTRACT

There are two main application areas for geogrid reinforcement in permanent paved roads.They are subgrade stabilization and base reinforcement. The kind of subgrade, subbase, and base course materials have a significant impact on the pavement's strength and lifespan.However, the majority of flexible pavements in India are built primarily over troublesome and poor subgrade. Base reinforcement increases the pavement's ability to support loads during repeated traffic by placing geogrids at the bottom of unbound layers of a flexible pavement system. The geogrid serves a critical function in subgrade stabilization applications by providing a construction platform over weak subgrades. This enables the transport of equipment and facilitates the construction of the pavement system while minimizing excessive deformations in the subgrade.Increased pavement thickness is required when the subgrades exhibit a relatively low California Bearing Ratio (CBR).

Soil samples with and without the geogrid layer are subjected to laboratory and simulated field CBR testing, as well as variations in the soil sample's location within the mold. The use of geogrid lowers the pavement thickness by up to 40% by raising the subgrade's CBR value.

Key word - Geogrids, Reinforcement, CBR Value, Flexible Pavement, Subgrade, Highway, Design, Expansive Soil