USAGE OF GEOGRIDS IN FLEXIBLE PAVEMENT DESIGN

As on 31 March 2018 estimates, the total road length in India 6,603,293km (4,103,096 mi) making the Indian road network, the second largest road network in the world after the united states. But the roads are not giving desired result due to poor CBR value. Roads in India have mostly the problems like formation of potholes, ruts, cracks and localized depression and settlement,especially during rainy season. These are mainly due to insufficient bearing capacity of the subgrade in water saturated condition. The subgrade soil mostly yields low CBR value 2-5%. In the CBR method of pavement design ( IRC:37-2012 ) total thickness of pavement increases exponentially with decrease in the CBR value of subgrade soil which in turn increases the cost of construction. So it has been tried to use geogrid material for increasing the bearing capacity of subgrade. Laboratory and simulated field CBR tests are conducted on soil samples with and without inclusion of geogrid layer and also by varying the position of it in the mould. Use of geogrid increases the CBR value of the subgrade and thereby reduces the pavement thickness considerably up to 40%. This study will have a positive impact on cost as it will reduce the Project as well as maintenance cost of road. Our project will discuss in detail the process and its successful applications.