TY - JOUR AU - Kasun Wimalasena, AU - Chamara Prasad Gunasekara Jayalath, PY - 2020/01/27 Y2 - 2024/03/28 TI - EFFECT OF GEOGRID REINFORCEMENT IN WEAK SUBGRADES JF - GEOMATE Journal JA - INTERNATIONAL JOURNAL OF GEOMATE VL - 18 IS - 65 SE - Articles DO - UR - https://geomatejournal.com/geomate/article/view/415 SP - 140-146 AB - <p><br>Geogrids can be identified as comparatively low cost alternative for pavement construction on <br>soft subgrades. However, comprehensive mathematical models are yet to be developed to define the composite <br>behaviour of geogrid pavements. Therefore, it is required to perform pavement model testing to understand the <br>performance of geogrid reinforcements under different pavement and geogrid conditions. Hence, this research <br>study aims to compare the behaviour of composite geogrid in a weaker subgrade (CBR &lt;3%) by performing <br>two pavement model tests under repeated loading conditions. A steel test box with length, width and height of <br>1m, 1m, 1.2m respectively were used to construct both models with a subgrade having 500mm thickness and <br>3% CBR. A 200mm thick granular layer was compacted on top of the subgrade by achieving 91% degree of <br>compaction. One model was selected as the control section and a composite geogrid at the base subbase <br>interface was included in the other one. Both pavement models were tested for more than 100,000 repeated <br>load cycles using a 200mm diameter plate on top of the granular base to simulate a tyre pressure of 550kPa. <br>The results demonstrated that the inclusion of a composite geogrid significantly reduced the rutting depth of <br>the granular layer and achieved a Traffic Benefit Ratio (TBR) of 5 at 50mm rutting. Furthermore, a significant <br>reduction of pressure transmission to the subgrade by the composite geogrid was observed.</p> ER -