Steel Micro-Fibre Reinforced High Strength

Fracture parameters of high strength mortar incorporating steel micro-fibers were investigated in this paper by means of direct tensile and three point bend tests. Uniaxial tensile tests were performed on unnotched and notched cores. The peak value measured on unnotched specimens was considered as the true tensile strength of the material. The maximum load/net-cross-section ratio of the fiber reinforced specimens was always found to be higher in the unnotched case than in the notched one. However, when there was no fiber in the mix (matrix alone), the ratio maintained a constant value whether the specimens were notched or unnotched. The paper discusses the results according to the fiber distribution in the fracture area. It was found that the strength can be related in a unique way to the number of fibers. This correlation was less tight when the post peak behavior was concerned. In the same way, three point bend test on notched beams gave results which depend, in terms of residual capacity, on the number of fibers crossing the ligament. Applying the concept of a cohesive crack, the direct tension results were used as input data in order to model the response of the flexural test. Calculations pointed out that slight differences, apparently negligible, in the casting of samples may significantly alter the softening behavior.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 137-146
  • Monograph Title: Role of Concrete in Sustainable Development

Subject/Index Terms

Filing Info

  • Accession Number: 01010826
  • Record Type: Publication
  • ISBN: 0727732471
  • Files: TRIS
  • Created Date: Nov 28 2005 11:42AM