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Research Paper | Civil Engineering | Nigeria | Volume 3 Issue 6, June 2014
Reinforcement of Subgrade Soils with the Use of Geogrids
Olaniyan O. S. [3] | Akolade A. S [2]
Abstract: This paper examined the basic engineering and geotechnical properties of poor subgrade soils using geosynthetics like geo-grids to improve its strength. This is considered to be of great importance in civil engineering works. Subgrade soils; its properties like permeability and strength are essential to the design of pavement structures. Experiments were carried out to investigate the application of geo-grids on subgrade soils under unsoaked conditions. Geotechnical test were carried out to determine Grain size analysis; atterberg; compaction and California bearing ratio test. CBR test were carried out by placing the geo-grids at varying depths and in single layer under unsoaked conditions to determine the strength of the soil. The result shows that the strength of subgrade is considerably increased by introducing geo-grids reinforcement in the soil. It is found that geo-grids placed at 3/5 the distance from the base showed higher CBR value than when placed at 2/5 and 4/5 distances from the base. The differences in the behavior of the soil under unsoaked conditions improve on increasing the number of layers of geo-grids. As a subgrade stabilizer it has shown great effect of improvement. It has low maintenance; corrosion resistance and increases the service life of road pavement. Geo-grids should be employed as a modernized form of improving road construction on poor subgrade materials
Keywords: Reinforcement, Geogrids, Aggregate, Subgrade interface
Edition: Volume 3 Issue 6, June 2014,
Pages: 2579 - 2584