Laboratory Investigations of Reinforced Sub Grade Soils

Most of the flexible pavements in India need to be constructed over problematic and poor subgrade. Such subgrades have low California Bearing Ratio (CBR), which leads to more thickness of the pavement. Decrease in avability of suitable subbase and base materials for highway construction have leads to a search for economic method of converting locally available troublesome soil to suitable construction materials. The present research has been undertaken to to study the effect of geogrid reinforcement on Maximum dry Density (MDD), Optimum Moisture Content (OMC), California Bearing Ratio (CBR) and E- Value of subgrade soils. Two types of soils with varying properties and one types of geogrid were selected for this study. The soils were refered as Soil – A and Soil – B. from the study it is cleared that there is considerable improvement in CBR value of subgrade due to geogrid reinforcement and it is the function of types of soil and position of geogrid. In case of soil - A and soil – B the CBR value were 4.15 % and 1.1 % respectively. This value increased to 6.83 % and 2.52 % respectively due to geogrid places at 80% depth from top of the specimen.