MINNE-ALF PROJECT OVERVIEW AND RETRO-FIT DOWEL STUDY RESULTS

A laboratory-based linear loading pavement test stand, the Minnesota Accelerated Loading Facility (Minne-ALF) simulates the passage of heavy traffic loads moving at speeds up to 65 kph (40 mph) over small, full-scale pavement test slabs. Hydraulic actuators control a rocker beam, which simulates loads. Researchers simulated the passage of 40-kN (9-kip) single-wheel loads at a rate of 172,000 per day, although wheel loads up to 100 kN (22 kip) can be simulated at varying speeds. Full-axle simulations are possible with frame modifications. Concrete slabs were cast and dowels were installed in slots across cracks/joints. Test variables included joint face texture, repair backfill material, and dowel material and length. Test outputs included measurements of load transfer efficiency and differential deflection across the joint/crack. The effect of joint/crack face texture was great when the joint/crack remained tight. Load carrying performance was improved using Speed Crete 2028 in place of 3U18 concrete backfill with similar joint and dowel bars. Load transfer was unaffected by the use of stainless steel-clad dowel bars in lieu of epoxy-coated dowel bars. Researchers recommend additional testing to examine the effects of dowel length and dowel materials.

• Record URL:
  http://www.lrrb.org/PDF/200002.pdf
• Record URL:
  https://ntlrepository.blob.core.windows.net/lib/16000/16900/16988/PB2000106654.pdf
• 
• Corporate Authors:

  University of Minnesota, Twin Cities

  Department of Civil Engineering, 500 Pillsbury Drive, SE
  Minneapolis, MN  United States  55455

  Minnesota Department of Transportation

  Transportation Building, 395 John Ireland Boulevard
  St Paul, MN  United States  55155
• Authors:
  • Embacher, R A
  • Snyder, M B
• Publication Date: 1999-12

Language

• English

Media Info

• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 97 p.

Subject/Index Terms

• TRT Terms: Accelerated tests; Deflection; Dowels (Fasteners); Laboratory tests; Load transfer; Pavement cracking; Pavement joints; Pavements; Retrofitting; Slabs; Speed; Test facilities; Wheel loads
• Uncontrolled Terms: Accelerated loading facilities
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00795257
• Record Type: Publication
• Report/Paper Numbers: MN/RC-2000-02,, Final Report
• Contract Numbers: 72272
• Files: NTL, TRIS, ATRI, STATEDOT
• Created Date: Jul 10 2000 12:00AM