Functional and cost- benefits of geosynthetics as subgrade reinforcement in the design of flexible pavement

Abstract

The vertical stress exerted by the vehicles will be high in a populated road and to increase the bearing capacity of subgrade characteristics, geosynthetic material can be used. In the current study different geosynthetic material such as geo-grid, geo-textile and geo-membrane were used to as a subgrade reinforcement member inside the CBR mould for understanding the improvement in subgrade for single, two and three geosynthetic layering in the CBR mould. The results show there was a constant increase in the bearing with the increase in a number of layers and this improvement varied with type of geosynthetic materials also. Among three geosynhteic materials, geogrid shows improved CBR characteristics. Finally, Cost analysis and design of flexible pavement were carried for an optimum number of layers for geogrids. There was reduction of about 6.38% in the cost of construction when using geogrid as subgrade reinforcement member.

A Comparative Laboratory Investigation into the Role of Geosynthetics in the Initial Swell Control of an Expansive Soil

“…provision of a cohesive non-swelling layer, provision of a moisture barrier, chemical stabilization, and use of geosynthetics. A lot of work has been done on the stabilization of expansive soils by different materials, resulting in improved swell-shrink characteristics [7]- [11] and geosynthetics have found a wide variety of applications in soil engineering in recent times, with a lot of research undertaken on their various applications [12]- [18]. However, the use of geosynthetics in swell control has not been dealt with to the same degree of detail or depth.…”