Investigation of approach slab and its settlement for roads and bridges.

Details

• Creators:
  Ng, Kam Weng ; Yasrobi, Seyed Yashar ; Edgar, Thomas V.
• Corporate Creators:
  University of Wyoming. Dept. of Civil and Architectural Engineering
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Bridge approaches
  • Slabs
  • Settlement (Structures)
  • Backfill soils
  • Bridge design
  • Bridge construction
  • Recommendations
  • Surveys
  • Literature reviews
• Publication/ Report Number:
  FHWA-WY-15/01F
• Resource Type:
  Tech Report
• Geographical Coverage:
  Wyoming
• Corporate Publisher:
  Wyoming. Dept. of Transportation
• Abstract:
  Approach slabs serve as a transitional system between an approach road and a bridge. Settlement of bridge approach slabs and their ; supporting backfill has been experienced by more than ten Departments of Transportation throughout the United States. According to ; current Wyoming Department of Transportation inspection reports, bridge approach slab settlements occurred not only on existing ; bridges but also on newly built bridges that were just opened to traffic. These settlements typically create voids ranging from 6-in to 12- ; in between the base of the approach slab and the geotextile reinforced backfill. This research presents factors causing bridge approach ; slab settlements and provides necessary design and construction recommendations. A comprehensive literature review pertaining to ; approach slabs was performed to examine outcomes of research conducted by 12 states. The current specifications and standards on ; bridge approach slabs of the corresponding states’ Departments of Transportation were also evaluated. A nationwide survey was ; conducted to fill in the missing knowledge identified in the literature review. The results of the survey are categorized in three groups ; based on the percentage of bridges experiencing approach slab settlements in that state. Results of the survey show that 46 percent of the ; total 28 respondents are not satisfied with their current approach slab designs. The survey results revealed that the most common cause ; of approach slab settlement is poor construction practices. The most important finding of the survey is that performing in-situ tests to ; control backfill compaction reduces the amount of approach slab settlement. Using the lessons learned from the literature and the results ; of the survey, potential amendments to current Wyoming Department of Transportation design and construction manuals are ; recommended
  More +
• Format:
  PDF
• Funding:
  64737
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28953/dot_28953_DS1.pdf
• File Type:
  [PDF - 4.96 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:26926732bf853f1eec2d6e06ec3456e5865367831dd36b038c67f2228306acf2