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Flexural properties and characterization of geopolymer based sandwich composite structures at room and elevated temperatures

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TitleInfo
Title
Flexural properties and characterization of geopolymer based sandwich composite structures at room and elevated temperatures
Name (type = personal)
NamePart (type = family)
Simonovic
NamePart (type = given)
Milan
DisplayForm
Milan Simonovic
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Pelegri
NamePart (type = given)
Assimina
Affiliation
Advisory Committee
DisplayForm
Assimina A Pelegri
Role
RoleTerm (authority = RULIB)
chair
Name (type = personal)
NamePart (type = family)
Tse
NamePart (type = given)
Stephen
Affiliation
Advisory Committee
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Stephen D Tse
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Lin
NamePart (type = given)
Hao
Affiliation
Advisory Committee
DisplayForm
Hao Lin
Role
RoleTerm (authority = RULIB)
internal member
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
Graduate School-New Brunswick
Role
RoleTerm (authority = RULIB)
school
TypeOfResource
Text
Genre (authority = marcgt)
theses
OriginInfo
DateCreated (qualifier = exact)
2007
DateOther (qualifier = exact); (type = degree)
2007
Language
LanguageTerm (authority = ISO 639-3:2007); (type = text)
English
PhysicalDescription
Form (authority = marcform)
electronic
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application/pdf
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text/xml
Extent
xiv, 107 pages
Abstract (type = abstract)
This thesis is an experimental study on structural changes and change of the mechanical properties of geopolymer-based sandwich structures. Specimens were prepared combining a potassium aluminosilicate geopolymer base, perlite filler and three different mass ratios of cenosphere material. Prepared specimens were left to age for four weeks at room temperature, before a reinforcing skin layer was added. The reinforcing layer was produced with one or two tows of ceramic or carbon fibers. Samples were divided into several groups and exposed to different temperatures: from room to one-hour exposure at 750° C. After temperature treatments, the samples were subjected to a three-point bending test and flexural properties were determined. SEM microscopy was used to examine the following features: contact properties between the geopolymer base and fillers, adhesion between the reinforcement fibers and core and micro structural changes in material caused by high temperature and loading conditions. It was determined that adhesion among the geopolymer material, fillers and fibers was very good. Cracks, which appeared after temperature treatment and flexural tests, usually progressed through lower-density areas (like undamaged perlite particles, voids or other imperfections) and higher-porosity areas of the geopolymer cenosphere mixture. The flexural strength of unreinforced samples was low (between 1-12 MPa). It was determined that thermally treated samples show a drastic decrease (60-65%) in residual flexural properties. After temperature treatment, significant sample deformation was observed. The SEM revealed that micro structural changes were significant, including increase in pore size, volume expansion, cracking and perlite and geopolymer material expansion. It was noticed that the maximum strength of sandwich structures falls with an increase of cenosphere mass ratio, but flexibility and material toughness increase. Tensile failure of the bottom reinforcing layer was the primary failing mechanism for the majority of tested samples. During thermal exposure, some samples experienced severe cracking and deformation, which caused premature (tensile) failures and other failure types (like core shear). It was concluded that the thermal stability of the tested material and structures was inadequate, that structural applications would not be recommended and that refractory applications would be limited.
Note (type = degree)
M.S.
Note (type = bibliography)
Includes bibliographical references (p. 104-107).
Subject (authority = RUETD)
Topic
Mechanical and Aerospace Engineering
Subject (authority = ETD-LCSH)
Topic
Sandwich construction
Subject (authority = ETD-LCSH)
Topic
Laminated materials
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Identifier (type = hdl)
http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.13725
Identifier
ETD_212
Identifier (type = doi)
doi:10.7282/T3CN74BV
Location
PhysicalLocation (authority = marcorg); (displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
Genre (authority = ExL-Esploro)
ETD graduate
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The author owns the copyright to this work.
Copyright
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Copyright protected
Availability
Status
Open
AssociatedEntity (AUTHORITY = rulib); (ID = 1)
Name
Milan Simonovic
Role
Copyright holder
Affiliation
Rutgers University. Graduate School-New Brunswick
RightsEvent (AUTHORITY = rulib); (ID = 1)
Type
Permission or license
Detail
Non-exclusive ETD license
AssociatedObject (AUTHORITY = rulib); (ID = 1)
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License
Name
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.
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