The concrete deck on the visitors' overlook facility at Libby Dam became badly cracked and in need of repair. It was decided to overlay the existing surface with 0.75-in to 2-in. (18 mm to 50 mm) of fibrous concrete. Cracks in the original surface and some expansion joints were overlain without special treatment. Union workers with no special training used standard tools and techniques to successfully place the overlay. By magnesium floating the surface they obtained excellent /0.125-in. per 10-ft (3 mm per 3 m)/ grade control and produced a skid resistant surface with virtually all fibers covered. A mix design procedure based on workability was developed for this placement. The simple procedure is available from the U.S. Army Corps of Engineers, Walla Walla District, and is good for mixes from morat to 0.75-in (18 mm) aggregates. After a couple years of service an evaluation of the overlay shows 90% reduction in cracking, 100% reduction in water leakage through the surface, and essentially no rusting or evidence of fibers at the surface.

  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  United States  10017-2398
  • Authors:
    • Schrader, E K
    • Munch, A V
  • Publication Date: 1976-4

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00139726
  • Record Type: Publication
  • Report/Paper Numbers: ASCE #11976
  • Files: TRIS
  • Created Date: Sep 21 1976 12:00AM