CASE STUDY REPORT ON THE USE OF FWD DEFLECTIONS IN ASSESSING SEASONAL VARIATIONS IN SUBGRADE STRENGTH

An extensive research study was initiated in 1990 to evaluate seasonal changes in the structural adequacy of asphalt concrete pavements within Alberta as measured by surface deflection and/or resilient modulus. Specifically, the objectives of this investigation were to: (a) identify seasonal subgrade temperature and soil matric suction trends, (b) identify and select suitable strength indices for measuring seasonal variations in pavement response, (c) develop laboratory predictive moduli models in terms of pertinent soil properties through dynamic repeated load testing, and (d) provide guidelines for future implementation of mechanistic-empirical pavement design methodologies. Falling Weight Deflectometer (FWD) tests were conducted at regular time intervals over a period of two years, and at various locations within the instrumented section. The laboratory phase involved extensive repeated load testing on remolded samples of the subgrade material taken from the instrumented site.

• Corporate Authors:

  Transportation Association of Canada (TAC)

  Ottawa, Ontario  Canada 
• Authors:
  • Khogali, WEI
  • Anderson, K O
• Conference:
  • 1995 TAC Annual Conference Proceedings. Volume 1 - Pavements, Soils and Materials and Canadian Strategic Highway Research Program (C-SHRP) Sessions
  • Location: Victoria, British Columbia, Canada
  • Date: 1995-10-22 to 1995-10-25
• Publication Date: 1995-10

Language

• English

Media Info

• Pagination: v.p.

Subject/Index Terms

• TRT Terms: Falling weight deflectometers; Load tests; Pavement design; Seasons; Subgrade (Pavements); Subgrade materials
• Uncontrolled Terms: Seasonal variations
• Subject Areas: Highways; Pavements; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00720466
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 29 1996 12:00AM