Flowable High Performance Fibre Reinforced Concrete

This paper describes how, typically the fiber volume fraction is less than one percent for most fiber reinforced concrete (FRC) that is used in field applications. At this low volume fraction, it is not possible to obtain strain hardening effect. The results presented in this paper deal with mixture proportions that contain up to 3.75 volume percent of fibers. These mixture proportions with carefully selected constituent materials were developed in order to provide guaranteed tensile strength of 6 MPa in any random direction. The composite was used to fabricate support beams with complex cross sections to support high speed Mag Lev trains. Therefore, the fresh mixture also had a flowing consistency. Test results show that high performance FRC with 3.75% fiber volume fraction is attainable and can be successfully applied in the field. The fibers were mixable with the mortar and concrete matrices. The mix was flowable and fiber distribution was uniform. Six mortar mix designs and one lightweight concrete mix and three fiber types were tested. Mortar mixes included cment Types II and V, mortar sand, condensed silica fume, and superplasticizers. The fiber types were hooked steel fibers, straight steel fibers, and polyolefin fibers. The mixes were successfully produced in a ready-mix plant. Flexural strengths obtained varied from 12 to 24 MPA, compressive strengths were in the range of 74 to 100 MPa and splitting tensile strengths ranged from 12.6 to 17 MPa. The flexural toughness was two to three time higher than those of conventional FRC.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 390-401
  • Monograph Title: Role of Concrete in Sustainable Development

Subject/Index Terms

Filing Info

  • Accession Number: 01010809
  • Record Type: Publication
  • ISBN: 0727732471
  • Files: TRIS
  • Created Date: Nov 28 2005 12:54PM