The most critical problem facing the highway industry is the rehabilitation of its distressed structures, particularly concrete bridge decks and pavements. Various forms of distress have occurred in some of the surfaces and different rehabilitation procedures can be very costly. There is a need to determine the most effective and the most economically advantageous means to rehabilitate the damaged concrete bridge decks and pavements. An investigation sponsored by the U.S. Department of Transportation has been completed at the South Dakota School of Mines and Technology to develop a tough, high-strength, high-density, durable concrete for bridge deck construction; and a medium-strength, flowing, structural concrete through the use of superplasticizers and steel fibers. The study was conducted in two phases. The first investigated the basic properties of concrete made with superplasticizers through the use of experimental mixtures conforming to the requirements dictated by statistically valid factorial designs, so that analysis of variance can be used in the evaluation. The second phase extended the findings into an evaluation of superplasticized concrete containing steel fibers. The study has been completed and the significant results are presented in this paper. The addition of the special type of steel fibers (with deformed ends and glued together into bundles with a quick water soluble adhesive) to superplasticized concrete greatly increased its ductility, toughness, impact resistance, ultimate flexural strength, post-crack load-carrying capacity, and shock resistance. The fiber-reinforced superplasticized concrete also had higher freeze-thaw durability and lower permeability. These improvements were achieved without a reduction of workability or the usual balling of steel fibers in the plastic concrete. Therefore, the fiber-reinforced superplasticized concrete is an almost ideal material for the rehabilitation of bridge decks and highway pavements, and for construction of other concrete structures.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 4-11
  • Monograph Title: International symposium on mechanical properties of special concrete
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00450746
  • Record Type: Publication
  • ISBN: 030903812X
  • Files: TRIS, TRB
  • Created Date: Feb 28 1986 12:00AM