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Project Details

Title:Field Evaluation of Geogrid-Reinforced Pavement Systems on Soft Subgrades
Principal Investigators:Evert Lawton
University:University of Utah
Grant #:69A3551747108 (FAST Act)
Project #:MPC-635
RiP #:01757149
RH Display ID:154981
Keywords:alternatives analysis, field studies, filtration, geogrids, geotextiles, pavement performance, pavements, reinforcing materials, soft soils, subbase (pavements), subgrade materials, test sections


The inclusion of geogrid reinforcement and geotextile filtration/separation within pavement systems bearing on soft subgrades can provide significant reductions in the thicknesses of the base course and subbase, thereby substantially reducing the cost of the pavement system and improving its long-term performance. However, our current knowledge is insufficient to know with certainty that our current design procedures and guidelines produce the most efficient and cost-effective design.

The primary objectives of this research project are to compare the performance of pavement systems on soft subgrades: (a) designed without and with geogrid to determine if they are comparable, (b) with the geogrid located at different depths within the Base Course to determine the location that will provide the maximum reinforcing benefit, and (c) without and with a geotextile filter/separator at the bottom of the granular base to determine the effectiveness of the geotextile.

These objectives will be accomplished by building and instrumenting several test sections within pavement systems bearing on soft subgrades during construction of a new roadway in Utah. The results of this research will be used to modify the design of geosynthetic-reinforced pavement systems within Utah and other states, resulting in more economical pavement systems with enhanced long-term performance.

Project Word Files

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