FIBROUS CONCRETE TESTED ON HIGHWAY

A SLIPFORM PAVER HAS PLACED A 3-INCH-THICK OVERLAY OF STEEL-FIBER-REINFORCED CONCRETE ON A 1300-FOOT SECTION OF THE FOUR EASTBOUND LANES OF A DETROIT HIGHWAY WITH AN ADT OF 100,000. THE CONCRETE CONTAINED SIX BAGS OF CEMENT PER CUBIC YARD. THE STEEL FIBERS WERE ADDED BY A CONVEYOR AT 120 AND 200 POUNDS/CUBIC YARD, WITH EACH MIX USED ON HALF THE TEST AREA. CONTRACTION JOINTS WERE SAWED AT 50- AND 100-FOOT INTERVALS, WHILE LONGITUDINAL JOINTS WERE OMITTED IN SOME SECTIONS. THE SECTION WAS TEXTURED TRANSVERSELY. AS THE FIBERS DO NOT MIX WELL WITH CONCRETE UNTIL THEY ARE LOOSENED UP, THEY WERE TUMBLED INSIDE A TRANSIT MIXER, THEN POURED ONTO A CONVEYOR LEADING TO THE BATCH MIXER. HOWEVER, THE NEEDLES FORMED NEW CLUMPS WHEN DUMPED AND HAD TO BE RAKED FROM A LOADER AND THROUGH A GRATE OVER THE CONVEYOR. A POWER SHAKER WOULD HAVE TO BE USED FOR BIGGER PAVING JOBS. TESTS INDICATE THREE-DAY FLEXURAL STRENGTH OVER 1000 PSI. EARLIER TESTS SHOW A 28-DAY STRENGTH OF 2000 PSI. IT IS PREDICTED THAT THE OVERLAY WILL LAST AT LEAST 30 YEARS.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08919526
• Publication Date: 1972-10-19

Media Info

• Pagination: p. 16
• Serial:
  • Engineering News-Record
  • Volume: 189
  • Issue Number: 16
  • Publisher: McGraw-Hill, Incorporated
  • ISSN: 0891-9526

Subject/Index Terms

• TRT Terms: Concrete; Concrete pavements; Fibers; Material reinforcement; Metal fibers; Overlays (Pavements); Reinforced concrete; Steel
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00214201
• Record Type: Publication
• Files: TRIS
• Created Date: May 15 1973 12:00AM