Effective Shoulder Design and Maintenance

David White, Mohamed Mekkawy, Charles Jahren, Duane Smith, and Muhannad Suleiman
Iowa State University, Iowa Highway Research Board, Iowa Department of Transportation

This report includes observations made during a field reconnaissance study, findings from an effort to stabilize the granular and subgrade layer at six shoulder test sections, and the results of a laboratory box study where a shoulder section overlying a soft foundation layer was simulated. Based on the research described in this report, the following changes are proposed to the construction and maintenance methods for granular shoulders

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