Shrinkage of Concrete with Aligned Steel Fibres and Steel Rings

Concrete in a drying environment inevitably experiences shrinkage arising from the physical and chemical loss of water. In this paper, a comparative study was undertaken in order to investigate the drying shrinkage characteristics of concrete under different reinforcing regimes. Six types of reinforced concrete specimens were studied, comprising of plain concrete and specimens that were reinforced with conventional steel mesh, steel fibers and a new concept involving steel rings. Hooked Dramix steel fibers were used in three different ways, namely by conventional random distribution, by aligning using a machine, and by aligning by hand on a horizontal layer of choice. Drying shrinkage of the concrete was measured for 90 days following a 28-day curing period. It emerged that samples with machine aligned steel fibers and steel rings performed as well as randomly aligned fiber samples, within the normal variations in such tests. These categories of reinforcement significantly out-performed conventional mesh and plain concrete, as expected. This conclusion will support the recent research into aligned fiber concrete, where significant ductility improvements in flexure have been established. It has now been shown that these improvements in flexure are not at the expense of a reduction in shrinkage performance.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 147-155
  • Monograph Title: Role of Concrete in Sustainable Development

Subject/Index Terms

Filing Info

  • Accession Number: 01010833
  • Record Type: Publication
  • ISBN: 0727732471
  • Files: TRIS
  • Created Date: Nov 28 2005 11:44AM