EFFECTIVENESS OF GEOSYNTHETICS FOR ROADWAY CONSTRUCTION IN COLD REGIONS: RESULTS OF A MULTI-USE TEST SECTION
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The Maine Department of Transportation has reconstructed a 3.0 km portion of U.S. Route 1A within the towns of Frankfort and Winterport, Maine. This roadway is plagued with poor subgrade soils (A-6) and has been historically known for its poor pavement performance. The reconstruction project is providing an excellent opportunity to evaluate the effectiveness of alternative pavement sections incorporating varying geosynthetics in different applications under northern climatic conditions. Multiple test sections encompassing the entire length of the project have been constructed using different combinations of geosynthetics including: single and multiple layers of geogrids as reinforcements with and without separation layers; high strength woven geotextile as reinforcement; woven and nonwoven geotextiles as separation/stabilization layers; and, geocomposites to provide horizontal drainage and act as a capillary barrier. Along with an overview of the project, this interim paper presents the reinforcement and drainage data collected during installation and after the first year of monitoring.