Quantify the Benefits of Using Geotextiles and Geogrids to Improve the Performance of Unbound Pavement Layers

Summary:

Geotextiles and geogrids are the most used geosynthetics in transportation/pavement applications. Geotextiles can reduce layer intermixing, facilitate moisture reduction, and provide confinement and stabilization to subgrade and base materials. Geogrids provide mechanical stabilization by giving strength to base and full depth reclamation material through lateral restraint and improved load bearing capacity in pavement systems. The main objective of the study is to produce a current best practices design guide for road designers detailing when to use and what types of geotextiles and geogrids to use for given soil, pavement designs, and traffic conditions. Having a guide will aid designers in utilizing these products to better predict pavement outcomes and to extend pavement life. The project tasks include (i) evaluating current MnDOT practice related to the beneficial and cost-effective use of geosynthetics; (ii) reviewing research and state of the practice on geosynthetics applications, available products, design methods, and specifications; and (iii) proposing recommendations for geosynthetic solutions in pavements to modernize MnDOT’s practices and manuals. The study will highlight current best practices and produce a synthesis report and a Technical Guide for using geotextiles and geogrids based upon soil type, pavement structure, and traffic loads, etc. This will include quantification of these benefits based upon the functions of the geotextile, i.e., separation, filtration, drainage, and stiffening or stabilization, and for geogrids, stabilization of aggregate cover over soft subgrade in unpaved roads and paved road unbound aggregate layer stabilization that will include the strength gain of the base or full depth reclamation material.

Final Deliverables:

Related Materials:

• New Project:Quantify the Benefits of Using Geotextiles and Geogrids to Improve the Performance of Unbound Pavement Layers  (Blog Post)

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