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Geosynthetic Stabilization of Weak Subgrade

Started: March, 2008 Ended: February, 2009 Project ID #4W2116 Status: Completed

Objective

This project aims to construct test sections in the field to investigate the relative benefit of various geosynthetics available on the market to an unpaved road.

Abstract

The use of stiff geosynthetics in unpaved roads on soft subgrade is known to provide a reinforcing benefit to the road, allowing better distribution of applied loads and increased bearing capacity. However, there is not yet an accepted standard design technique that incorporates the material properties of the geosynthetic in the design to account for the reinforcement it provides. Therefore, design of a geosynthetic unpaved road should take into consideration the results of preceding laboratory and field investigations. This project aims to construct test sections in the field to investigate the relative benefit of various geosynthetics available on the market to an unpaved road. The location of the test sections is in Lewistown, Montana at the TRANSCEND research facility operated by the Western Transportation Institute. A prepared and placed subgrade will provide equivalent conditions for each test section; likewise the gravel surfacing along the entire test bed will be uniform. Controlled traffic loading with frequent rut profile measurements will indicate performance benefits of each geosynthetic in the test sections. Additionally, post-traffic examination of the geosynthetic will provide invaluable information regarding the performance and installation survivability of the geosynthetics. This effort is jointly sponsored by the Montana Department of Transportation (MDT); NAUE GmbH & Co. KG, a geosynthetic manufacturer based in Germany; and the University Transportation Center (UTC) program (part of the Research and Innovative Technologies Administration of the USDOT). NAUE is sponsoring the construction and monitoring of four test sections; while MDT is sponsoring the construction and monitoring of an additional seven test sections. The UTC program will provide support to the overall effort. Data collected and conclusions drawn from these parallel projects will be summarized in an integrated final report. This project represents the NAUE portion of the overall effort.

Contacts

Sponsors & Partners

  • Montana Department of Transportation (MDT) Sponsor
  • BBG Bauberatung Geokunststoffe GmbH & Co. KG Co-Sponsor
  • Research and Innovation Technology Administration (RITA) Co-Sponsor

Part of: Infrastructure Maintenance and Materials, Transcend

Project Tagged In: geosynthetic materials, pavement design, traffic loading

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