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Video Conference

Geosynthetic Reinforced Subgrades and Bases

  • Feb 1, 2012 (9:00 - 12:00 pm CT; 8:00 - 11:00 am MT)
    Video Conference (designated rooms at DOT sites)


State and local agencies are facing roadway construction challenges due to increasing truck loadings through growing agriculture, manufacturing or energy development. This is occurring while aggregate supplies are becoming scarcer, resulting in increasing uneconomical haul distances. Geosynthetic reinforcing provides additional options in roadway grading projects by improving drainage and strengthening the subgrade, and offering an option to reduced subbase and base thicknesses. The presentation will provide technical insights into the use of geosynthetics in the areas of grading, subbase and base construction. The presentation will take into account the subbase and base specifications and characteristics of North Dakota, South Dakota and Wyoming. The presentation will also cover selection of geosynthetic materials to accommodate each state’s specifications.

Expected Outcomes:

  • An understanding of how geosynthectics can be utilized to increase reliability and longevity of reconstructed roadways.
  • An understanding of potential cost reductions resulting from the use of geosynthetic reinforcing to reduce subbase and base thicknesses.


Daniel Alzamora, P.E., Geotechnical Engineer at FHWA, has 21 years of geotechnical experience. His specialties include Column Supported Embankments, Earth Retaining Structures, Geosynthetics, Geophysics, and Reinforced Soil Slopes. He has a BSCE from the University of Connecticut, an MSCE from the University of Colorado, and is a Registered PE with the state of Georgia.

Target Audience

Highway designers, materials staff, construction staff, specification writing staff, county engineers and road superintendents, project programming staff, geotextile suppliers, contractors, etc.

More Info

The above resource and more can be accessed by visiting the TLN Learning Management System (LMS).

NDSU Dept 2880P.O. Box 6050Fargo, ND 58108-6050