Instrumentation and Monitoring of Distress Remediation Strategies at Alabama Highway 5

Alabama Highway 5 is a farm-to-market road built directly on an expansive clay subgrade. Moisture fluctuations cause the soil to shrink and swell, resulting in severe pavement distress. Laboratory testing was performed to characterize the shrink-swell behavior of the subgrade soil. Swell pressures of up to about 72 kPa (1,500 psf) have been observed in the laboratory. Several remediation strategies have been implemented at AL-5 in an attempt to reduce the need for pavement maintenance. These techniques include increased drainage, vertical moisture barriers, lime columns, and paved shoulders. To evaluate the performance of these test sections and further characterize the soil behavior, field instrumentation has been installed including soil moisture sensors, soil suction sensors, pore water pressure sensors, and asphalt strain gages. This paper details the instrumentation placed in the improved test sections and evaluates the sections over time.

Language

  • English

Media Info

  • Media Type: Web
  • Pagination: pp 463-472
  • Monograph Title: IFCEE 2018: Innovations in Ground Improvement for Soils, Pavements, and Subgrades

Subject/Index Terms

Filing Info

  • Accession Number: 01685699
  • Record Type: Publication
  • ISBN: 9780784481592
  • Files: TRIS, ASCE
  • Created Date: Oct 4 2018 4:58PM