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Performance of reinforced concrete beams retrofitted with fiber-reinforced shotcrete at early age

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TitleInfo
Title
Performance of reinforced concrete beams retrofitted with fiber-reinforced shotcrete at early age
Name (type = personal)
NamePart (type = family)
Holland
NamePart (type = given)
Reid
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Reid Holland
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Nassif
NamePart (type = given)
Hani
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Hani Nassif
Affiliation
Advisory Committee
Role
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chair
Name (type = personal)
NamePart (type = family)
Abu-Obeidah
NamePart (type = given)
Adi
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Adi Abu-Obeidah
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Yong
NamePart (type = given)
Yook-Kong
DisplayForm
Yook-Kong Yong
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
School of Graduate Studies
Role
RoleTerm (authority = RULIB)
school
TypeOfResource
Text
Genre (authority = marcgt)
theses
OriginInfo
DateCreated (encoding = w3cdtf); (keyDate = yes); (qualifier = exact)
2019
DateOther (encoding = w3cdtf); (qualifier = exact); (type = degree)
2019-10
Language
LanguageTerm (authority = ISO 639-3:2007); (type = text)
English
Abstract (type = abstract)
Similar to how a lot of our country’s land has already been developed, a lot of our necessary structures have already been built. Our infrastructure relies on old bridges, buildings, dams, etc. which produce a massive economic strain in the form of repair and maintenance. Tearing down an old structure to create a new one is not nearly as economical as its improvement or repair. These economic factors force our hands as engineers to produce new technologies to increase economic efficiency, one of them being shotcrete. In recent years, shotcrete has gained a lot of traction in its usefulness for repairing and retrofitting due to its ease of application and bond strength to the applied substrate.
In this study, the effects of shotcrete on the repair of reinforced concrete beams is examined using fiber reinforced shotcrete (FRS) with and without a steel or basalt mesh for a total of 3 different shotcrete layer types. Each mix is tested at two different curing times after the shotcrete is applied, 3 days and 7 days. The effectiveness of fiber reinforced shotcrete is monitored using synthetic macro fibers (1.5") in a shotcrete laminate versus the same fibers in self-consolidating concrete (FR-SCC). The shotcrete proved to have a higher ultimate strength, lower crack width, and higher deflection compared to a concrete beam compared to the FR-SCC laminates and Full Class A beams.
In order to simulate the already deteriorated reinforced concrete beam in a controlled lab environment the beams, stirrups were exposed at the bottom where the shotcrete is applied. Included in the shotcrete layer is a steel mesh or basalt mesh with 1 square inch openings to produce a shotcrete laminate, while also studying an FR-SH layer with no mesh. Of the two meshes used, steel proved to be the most beneficial for ultimate load, while basalt was more beneficial for deflection. Having no mesh also proved to be a viable design option, however, provides no benefit over the two except for early age ductility.
Curing methodology is also studied in order to better gage optimal curing regimes. The three methods examined were wet burlap, curing compound, and dry curing where dry curing involves only wrapping the concrete member in plastic. Of the three, the most consistent performer was wet burlap. Curing compound proved to be more erratic, though overall similar to wet burlap and dry curing proved to have good early properties, however is not considered sufficient for later stages.
In addition to beam testing, a comparison between the hardened properties of shotcrete were compared under different methods. Cylinders were shot directly by the nozzleman during casting and cast by hand using the same mix before being shot in both 4"x8" and 6"x12" cylinders. These were compared with cored samples to see which results more closely relate to the cylinders to help produce an easier method of testing the shotcrete’s properties. Overall, only compression and tensile strengths were relatable due to constraints of how the cylinders can be tested. Cored samples cannot be tested using the same methodology and would have to be developed. For compression strength, the 4"x8" cylinders cast by hand produced results very similar to the cored samples. For tensile strength, the 4"x8" cylinders shot by the nozzleman were very similar. Both have potential to be used as a substitute to cores.
Subject (authority = RUETD)
Topic
Civil and Environmental Engineering
Subject (authority = LCSH)
Topic
Shotcrete
Subject (authority = LCSH)
Topic
Concrete beams -- Maintenance and repair
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_10357
PhysicalDescription
Form (authority = gmd)
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
1 online resource (xi, 97 pages) : illustrations
Note (type = degree)
M.S.
Note (type = bibliography)
Includes bibliographical references
RelatedItem (type = host)
TitleInfo
Title
School of Graduate Studies Electronic Theses and Dissertations
Identifier (type = local)
rucore10001600001
Location
PhysicalLocation (authority = marcorg); (displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
Identifier (type = doi)
doi:10.7282/t3-k98p-tn82
Genre (authority = ExL-Esploro)
ETD graduate
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RightsDeclaration (ID = rulibRdec0006)
The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Holland
GivenName
Reid
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2019-09-30 19:04:39
AssociatedEntity
Name
Reid Holland
Role
Copyright holder
Affiliation
Rutgers University. School of Graduate Studies
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Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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2019-09-27T16:16:22
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