Stabilization of Pavement using Geogrid

October 16, 2024

Geogrid reinforcement is a method used in permanent paved roadways in two major application areas.They are: base reinforcement and subgrade stabilization. The strength and life of pavement is greatly affect the type of subgrade, sub base and base course materials.

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Properties of subgrade are compressive and shear strength. Sub -grade soils vary considerably, the relationship of density ,texture ,moisture content of sub-grade is highly complex. are sub –base ,sub-grade, base course and hearing course effect of geo-grid on maximum dry density optimum moisture content and Californian Bearing Ratio of subgrade soils., Also reinforced soils are often treated as composite materials in with reinforcement resisting tensile stress and interacting with soil through friction. There is lot of experience with geo-grid reinforcement of subgrade soils, many pavement failures still happen.Hence laboratory tests are required to study strength characteristics of both reinforced and unreinforced sub-grade soils.This project work describes the effects of reinforcing the sub-grade layer with a one layer of geo-grid at different positions and thereby determination of optimum position of reinforcement layer. The optimum position is determined based on CBR value. and unconfined compression tests were conducted to decide the optimum position of geo -grid. Soil reinforcement is a highly attractive alternative for pavement construction

GEOGRID PROPERTIES

Many of the physical properties of geogrids including the type of structure, rib dimensions ,junction type, aperture size and thickness can be measured directly. Other increase in the CBR value was achieved when geo-grid was placed at 20% depth from the top of the specimen

GEOGRIDS IN ROADWAYS AND PAVEMENTS

Geogrid provide significant improvement in pavement construction and performance. Figure 1 illustrates a number of potential geogrid applications in a layered pavement system to improve its performance. The reinforcement applications shown in Figure 1 can be provided by geogrids. These applications include subgrade stabilization, base reinforcement and asphalt reinforcement. Subgrade stabilization refers to situations where geogrid are placed on weak subgrade prior to the placement of an aggregate layer.