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Restrained shrinkage behavior of crimped steel fiber reinforced self-consolidating concrete
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Liberti, Giuseppe. Restrained shrinkage behavior of crimped steel fiber reinforced self-consolidating concrete. Retrieved from https://doi.org/doi:10.7282/T30R9S9N

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TitleRestrained shrinkage behavior of crimped steel fiber reinforced self-consolidating concrete
NameLiberti, Giuseppe (author); Nassif, Hani (chair); Najm, Husam (internal member); WANG, HAO (outside member); Rutgers University; Graduate School - New Brunswick
Date Created2017
Other Date2017-05 (degree)
SubjectCivil and Environmental Engineering, Self-consolidating concrete, Concrete
Extent1 online resource (xi, 100 p. : ill.)
DescriptionThe use of self-consolidating concrete (SCC) is becoming more popular thanks to its superior workability and its ability to consolidate under its own weight without the need for external compaction or vibration. With the advancements of admixtures like superplasticizers, SCC can now match the strength and other properties similar to high performance concrete (HPC). SCC contains a higher amount of cementitious material than ordinary HPC which makes it prone to higher levels of shrinkage which can be problematic in situations where the concrete is restrained. When concrete is restrained, shrinkage induced cracking can occur. This study compares the restrained shrinkage properties of an SCC mix controlled with 1½ in. crimped steel fibers mixed in. The SCC control mix without fiber is compared with mixes containing 0.35, 0.50, 0.65, and 0.80% of steel fiber by volume. To improve workability, additional superplasticizer, in the form of high range water reducer (HRWR), was added accordingly. Mixes above 0.65% by volume did not pass the fresh properties and workability requirements even with the additional HRWR. Strength was shown to decrease with the addition of fibers, sometimes up to 40%, but regained strength at higher fiber contents. Free shrinkage was also monitored but shown to have minimal effects. To understand the restrained shrinkage behavior of the mixes, one ASTM restrained shrinkage ring in accordance with ASTM C 1581 and two AASHTO restrained shrinkage rings in accordance with ASTM T334 were casted for each mix. The AASHTO T334 ring was modified to place 6 vibrating wire strain gauges (VWSG) to directly measure the strain in the concrete and predict where cracks will form. Despite the lower strength, the FRSCC mixes delayed and sometimes prevented large cracks from forming and propagating, reduced crack widths up to 73%, and reduced total cracking area by up to 73% compared the control mix. Between the two ring tests, the ASTM ring induced larger cracks earlier than the AASHTO ring making for easier and quicker results.
NoteM.S.
NoteIncludes bibliographical references
Noteby Giuseppe Liberti
Genretheses, ETD graduate
Persistent URLhttps://doi.org/doi:10.7282/T30R9S9N
Languageeng
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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