However, the performance of geocell-reinforced RAP as a base course overlaid by an asphalt surface is unknown. A preliminary study conducted by the principal investigators has shown that the use of geocell to confine RAP minimizes creep of RAP under a sustained load. However, RAP has its limitations for example, it creeps under a sustained load due to the presence of asphalt binder. One attractive option is to use recycled asphalt pavement (RAP) materials as base courses with a thin new overlay. On-site use of recycled asphalt pavement materials has obvious benefits from economic, to environmental, to sustainability points of view. Reconstruction of a pavement requires removal of pavement surfaces. When the condition of a pavement becomes badly deteriorated, reconstruction of the pavement may become an economic and feasible solution. Maintenance and overlaying may solve minor to medium pavement distress problems. These studies showed that geocell-reinforced base courses reduced the vertical stresses at the interface between subgrade and base course, reduced permanent and creep deformations, increased elastic deformation, stiffness, and bearing capacity of base courses.Īsphalt pavements deteriorate with traffic (especially heavy trucks) and time. This paper summarizes the main research findings from these studies addressing permanent, elastic, and creep deformations, stiffness, bearing capacity, and stress distribution, development of design methods for geocell-reinforced bases. A series of static and cyclic plate loading tests, full-scale moving wheel tests, and numerical modeling were conducted by the research team at the University of Kansas on geocell-reinforced base courses with different infill materials (Kansas River sand, quarry waste, well-graded aggregate, and recycled asphalt pavement). However, limited research has been done on three-dimensional geocell reinforcement of base courses. In the past, most of the research on subgrade improvement and base reinforcement has been focused on planar geosynthtics, such as geogrid and woven geotextile.
Geosynthetics have been widely used as construction materials for soil reinforcement since 1970s.
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