EFFECT ON CBR VALUE OF EXPANSIVE SOIL WITH GEOGRID REINFORCEMENT

The aim of this study is to look into the effect of geo-grid on the improvement of California bearing ratio (CBR) of expensive soil. Construction of structures over expansive soils possesses difficulties like differential settlements, poor strength and high compressibility. Expansive soils are poor in strength and that they will lead to poor pavement support and ultimately affects the pavement performance and its life period. The status and life of pavement is considerably affected by the type of subgrade, sub-base, and base course materials. The California bearing ratio (CBR) of these sub-grade soils have low, which leads to provide more thickness of flexible pavement. For this study of improving CBR value of the sub-grade soil one type of geo-grid is used. The result of this study clearly shows that there is significant increase in the CBR value of the sub-grade soil due to the geo-grid reinforcement. The CBR value was tested by placing the geo-grid mesh at varying depths and it was found that geo-grid placed at 0.5 the distance from the top of the CBR test mould shows higher value.