CARDIFRC: Manufacture and Constitutive Behaviour

This paper will describe the important steps for the manufacture of high performance fiber reinforced cementitious composite developed at Cardiff University. These steps have been patented and the class of material produced were registered under the trademark CARDIFRC®. The two most important steps are the maximization of the dry density through optimization and the even and random distribution of short steel fibers up to a volume fraction of 8%. Two lengths of fiber were used, 6 and 13mm, the diameter in each case being of 0.15mm. The even distribution of fibers was confirmed by sectioning and image analysis, as well as by the non-destructive technique of computerized tomography. The paper also introduces a micromechanical model for describing the constitutive behavior of CARDIFRC®. This model predicts the tensile strength, the compressive strength and the toughness of the material as function of the mix and fiber parameters. Most importantly, the model allowed workability of the mix (without fibers) to be included as a technological constraint. This was achieved by first relating the workability to the fracture toughness of the brittle matrix, i.e. by expressing the latter as a function of the mix variables (volume fraction of quartz sand, water to binder ratio, superplasticizer to water ratio, maximum size of quartz sand) for a given workability.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 233-244
  • Monograph Title: Role of Concrete in Sustainable Development

Subject/Index Terms

Filing Info

  • Accession Number: 01010839
  • Record Type: Publication
  • ISBN: 0727732471
  • Files: TRIS
  • Created Date: Nov 28 2005 12:10PM