• Iqra Rouf Nabi
• Rahul Thakur

Abstract:- Geosynthetics are defined herein as fabrics, grids, composites, or membranes. Application of geosynthetics for poor soil up-gradation has become a novel course in modern civil engineering projects, especially in road construction projects. Sub-grade soils which endorse the road surface in load carrying, its physical properties such as permeability, strength, etc. are critical to the pavement design. Moreover, a direct correlation has been found between cost and thickness of the pavement. In the proposed work, Uni-axial geogrids (40 kN/m and 60 kN/m tensile strength) and Bi-axial geogrids (40 kN/m and 60 kN/m tensile strength) were used to investigate the effect on strength improvement of subgrade of flexible pavement. For this, CBR tests were performed on soil Samples (subgrade) consolidated with Uni-axial geogrids and Bi-axial geogrids of depth H/4, H/2, and 3H/4, and H/4, 3H/4 and 2H/3 respectively under soaked and unsoaked conditions. Moreover, in the present research work ideal location establishing the geogrid within the subgrade by changing its position along with the depth and finding the CBR value corresponding to each location. Similarly, for any specific depth, the effect of different types of geogrids towards CBR improvement was also studied. It was found that CBR values improved significantly due to reinforcement. In case of single layer and double layer geogrid reinforcement maximum values were obtained when geogrids were placed at H/4 and H/3 and 2H/3 under soaked and unsoaked conditions respectively. Therefore, geogrids can be utilized to reduce the stresses in case of flexible road surfaces. However, further research should be carried out to confirm the same thing.

CBR, Sub-grade, Geogrid.

"Potential Benefits of Geogrid in a Flexible Pavement System", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.528-537, June 2019, Available :http://www.jetir.org/papers/JETIR1907I65.pdf

"Potential Benefits of Geogrid in a Flexible Pavement System", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp528-537, June 2019, Available at : http://www.jetir.org/papers/JETIR1907I65.pdf