United States Department of Transportation
i
Geosynthetics : Specifications and Applications for Arizona
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2017-06-01
[PDF-2.39 MB]
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Abstract:The purpose of this Arizona Department of Transportation (ADOT) research study was (1) to update the ADOT geosynthetic specifications for geogrids, geotextiles, geomembranes, and composites; and (2) to recommend design guidelines for using geosynthetics for base reinforcement and subgrade stabilization. The study included a survey of other states regarding their material specifications for geosynthetics and their design guidelines for using geosynthetics for base reinforcement and subgrade stabilization. The study also included a review of available research, studies, and design methods for using geosynthetics for base reinforcement and subgrade stabilization. Recommended design guidelines were developed for ADOT on the basis of the review. The costs of using geosynthetics for base reinforcement and subgrade stabilization were analyzed. The analysis compared the construction costs for design alternatives with and without geosynthetics using the recommended design guidelines. The cost comparisons focused exclusively on construction costs (i.e., installed materials). There were insufficient data in the literature to develop a life-cycle cost analysis for geosynthetic use in pavements. It was determined that geosynthetics can be cost-effective for base reinforcement and subgrade stabilization. The cost savings is dependent on the design conditions, the type of geosynthetic used, and the material costs. Finally, new ADOT material specifications for geosynthetics were recommended, and revisions to the installation specifications were suggested. The recommendations were based on the results of the surveys, research, evaluations, and design guidelines developed through this project.
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