Design Issues for Concrete Reinforced with Steel Fibers, Including Fibers Recovered from Used Tires
Publication: Journal of Materials in Civil Engineering
Volume 18, Issue 5
Abstract
The writers are investigating the use of steel fibers, recovered from used tires (RSF), as concrete reinforcement, aiming at the development of design recommendations. This paper presents part of this research and examines initially an existing design guideline, developed by RILEM for steel fiber-reinforced concrete (SFRC), in order to assess the suitability of the guideline for the flexural design of concrete reinforced with RSF (RSFRC). This examination indicates that, although the RILEM guideline is in general suitable for the flexural design of RSFRC, there are some fundamental issues related to the evaluation of the tensile stress–strain behavior of SFRC that affect the accuracy of the guideline. Thus, based on this conclusion, a new approach is outlined for the evaluation of the tensile stress–strain behavior of SFRC and models are derived for different types of RSF and industrially produced fibers. These models are applied to the flexural design of concrete reinforced with RSF (RSFRC) and results are compared with those obtained by using the RILEM tensile stress–strain models. It is concluded that the model proposed in this study is more conservative and accurate than the RILEM models. Recommendations are also made on values of tensile strain to be used as the ultimate limit state, when predicting the resistance capacity of SFRC and RSFRC.
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Acknowledgments
The writers wish to acknowledge the Marie-Curie EU Community program “Improving Human Research Potential and the Socioeconomic Knowledge Base” under Contract No. UNSPECIFIEDHPMF-CT-2002-01825, and U.K. Government’s Department of Trade and Industry for the partners in innovation project “Demonstrating steel fibers from waste tires as reinforcement in concrete” (Contract No. UNSPECIFIEDCI 39/3/684, UNSPECIFIEDcc2227).
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 18 • Issue 5 • October 2006
Pages: 677 - 685
Copyright
© 2006 ASCE.
History
Received: Oct 1, 2004
Accepted: Jun 14, 2005
Published online: Oct 1, 2006
Published in print: Oct 2006
Notes
Note. Associate Editor: Laura De Lorenzis
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