Post-Crack Behavior of Macro-Fiber Reinforced Concrete
2018-01
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Post-Crack Behavior of Macro-Fiber Reinforced Concrete
Authors
Published Date
2018-01
Publisher
Type
Thesis or Dissertation
Abstract
Structural fibers are used in thin concrete overlays, pavements, and many other civil engineering structures for improving concretes long-term performance. These fibers improve the structural integrity of concrete by enhancing the post-crack performance and load transfer efficiency of concrete in un-dowelled thin concrete overlays. However, the pavement industry often encounters problem in selecting the appropriate type of fibers and their corresponding dosages. The primary objective of this study was to conduct a laboratory study to quantify the benefit of structural fibers in terms of pre-and post-crack behaviors in flexural specimens and to, as a goal, provide methods that characterize the behavior of fibers in fiber reinforced concrete (FRC). In this study, two new properties (post-crack toughness and post-crack performance (PCP) index) were proposed. Eleven different types of fibers were tested at three different dosages each for regular strength mixes (total 33 mixes). Also, four other low strength FRC mixes were considered. Hardened concrete properties of all these FRC mixes were compared with the control plain concrete mix. The following hardened concrete properties were considered: compressive strength, modulus of elasticity, modulus of rupture, residual strength, residual strength ratio, post-crack toughness, and PCP index. The study found good correlations between properties of fibers and FRC performance. It was found that fibers having a crimped, embossed, twisted or hooked-end geometry greatly outperform straight fibers. Post crack toughness was seen to produce stronger and more accurate correlations to cracked FRC, while the PCP index provided a tool for evaluating a fiber’s ability to add post crack performance with an increase in a fiber’s volume fraction. The mechanistic estimation method was developed to complete two tasks; estimate the fibers effective working stress (EWS) and to provide a tool for approximating a FRC’s flexural performance. As an auxiliary component to the core of this study, joint performance (as it pertains to concrete slabs -on -ground) was also evaluated. This separate study drew correlations between joint performance and fiber dosage and then compared joint performance to flexural performance.
Description
University of Minnesota M.S. thesis.January 2018. Major: Civil Engineering. Advisor: Manik Barman. 1 computer file (PDF); ix, 142 pages.
Related to
Replaces
License
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
Hansen, Bryce. (2018). Post-Crack Behavior of Macro-Fiber Reinforced Concrete. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/201003.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.