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Steel or synthetic fiber reinforced concrete “Practical Fit-for-Purpose Selection Guide”

Title: Steel or synthetic fiber reinforced concrete “Practical Fit-for-Purpose Selection Guide”
Author(s): Robert Wojtysiak, Kimberlee Borden
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Nb references: 33
Language: English

Abstract: The purpose of this paper is to present and provide examples using an applied statisticalbased method for the design and selection of blended fiber reinforced concretes (FRC) in flexure, to be used on both ground slabs and elevated composite slabs. It will also provide a qualitative selection approach for use by design engineers for a large range of serviceability criteria that may be satisfied by FRC. A series of projects in the Chicago area and Puerto Rico were designed and constructed using methods of qualitative and quantitative selection. The design selection examples were actually constructed based upon this approach. Specifically, compressive strengths, flexural strengths and residual flexural strengths of design mixes, specified in the 4 to 5 ksi compressive strength range, are statistically analyzed so as to provide a level of quality judged adequate for design. The mix design specifications for these are provided for reference and completeness. Guidance for the selection of the serviceability criteria is assembled for all categories of serviceability. Serviceability is used in an expanded definition from that in use by current codes and literature. An established, simple service load base method of flexural design is modified to incorporate statistically based values. This method is then used to provide a level of quality that can be measured in the field and through a QA/QC program. Several examples of designs actually constructed are provided for information and guidance. Over twenty projects have been constructed using blended fiber reinforced concretes employing these design and selection methods during the last five years. These facilities have been occupied and have performed within the Owner’s expectations. It appears that a statistical approach provides a measure of quality that has not been utilized to date but meets the intent of the fit for purpose criteria selected. The qualitative approach proposed is appropriate to aid in satisfying serviceability criteria. The simple service load based method accounts for the inelastic behavior available. The method of design using the statistical approach has the advantage of being specific to the demands of a particular use, in a particular location and allows local custom and practice in the manufacture of fiber reinforced concrete. The method accommodates either a single fiber type and geometry or a series of fibers of different geometries and materials (blends).

Online publication: 2004-03-25
Classification: Applications
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.093

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