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Restrained shrinkage behavior of high-performance concrete containing slag
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Restrained shrinkage behavior of high-performance concrete containing slag
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ETD_1959
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051881
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eng
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theses
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Civil and Environmental Engineering
Subject
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(authority = ETD-LCSH)
Topic
High strength concrete--Additives
Subject
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(authority = ETD-LCSH)
Topic
Slag concrete
Subject
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(authority = ETD-LCSH)
Topic
High strength concrete bridges
Abstract
Many high-performance concrete (HPC) bridge decks have been observed to exhibit cracking even after a couple days from casting. The shrinkage of concrete is one of the main causes of why bridge decks crack. Since bridge decks tend to restrain concrete from shrinkage, tensile stresses build up and cause the concrete to crack. Other factors also such as loading cause concrete to crack as well. It is important to test various HPC mixes under restrained conditions to analyze their cracking behavior and severity.
The AASHTO test (PP 34-06, The Passive or Restrained Ring Test) is utilized to measure the shrinkage of HPC mixes containing slag under restrained conditions. Cracking patterns are also investigated as well. The use of six Vibrating Wire Strain Gages (VWSGs) have been added in order measure the strain in the concrete ring directly and to detect the actual cracking day. Other tests including the free shrinkage and mechanical properties tests (compressive strength, tensile strength, and elastic modulus) were performed on each mix. The shrinkage performance and cracking behaviors were reported and compared based on total cementitious content, coarse aggregate content, and the coarse aggregate to fine aggregate ratio. It was found that the total cementitious content, coarse aggregate content and its ratio to fine aggregate can significantly affect shrinkage and make that mix more or less likely to crack. Mixes with low coarse aggregate content and highest cementitious content crack the earliest and have the most servere cracking. Mixes with lower cementitious content and a higher coarse aggregate content and ratio tend to crack later and some have a least one ring specimen free of any cracking. Complimentary linear free shrinkage blocks were also tested to correlate the free shrinkage performance with the restrained shrinkage performance of each mix. Any mix with a free shrinkage strain less than 450 microstrains day 56 tends to perform best under restraint conditions. Those mixes contain the lower cementitious contents (less than 700 lbs/cu yd), a higher coarse aggregate content (1800 lbs/cu yd), and a higher coarse aggregate to fine aggregate ratio of 1.6.
The AASHTO test (PP 34-06, The Passive or Restrained Ring Test) is utilized to measure the shrinkage of HPC mixes containing slag under restrained conditions. Cracking patterns are also investigated as well. The use of six Vibrating Wire Strain Gages (VWSGs) have been added in order measure the strain in the concrete ring directly and to detect the actual cracking day. Other tests including the free shrinkage and mechanical properties tests (compressive strength, tensile strength, and elastic modulus) were performed on each mix. The shrinkage performance and cracking behaviors were reported and compared based on total cementitious content, coarse aggregate content, and the coarse aggregate to fine aggregate ratio. It was found that the total cementitious content, coarse aggregate content and its ratio to fine aggregate can significantly affect shrinkage and make that mix more or less likely to crack. Mixes with low coarse aggregate content and highest cementitious content crack the earliest and have the most servere cracking. Mixes with lower cementitious content and a higher coarse aggregate content and ratio tend to crack later and some have a least one ring specimen free of any cracking. Complimentary linear free shrinkage blocks were also tested to correlate the free shrinkage performance with the restrained shrinkage performance of each mix. Any mix with a free shrinkage strain less than 450 microstrains day 56 tends to perform best under restraint conditions. Those mixes contain the lower cementitious contents (less than 700 lbs/cu yd), a higher coarse aggregate content (1800 lbs/cu yd), and a higher coarse aggregate to fine aggregate ratio of 1.6.
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electronic resource
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xiii, 153 p. : ill.
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M.S.
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Includes bibliographical references (p. 151-153)
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by John Montemarano
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Montemarano
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John
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1983-
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John Montemarano
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Hani
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Hani Nassif
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Kann
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co-chair
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Kann Ozbay
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Husamuddin
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Husamuddin Najm
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Rutgers University
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Graduate School - New Brunswick
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2009
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2009-10
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xx
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Rutgers University Electronic Theses and Dissertations
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Graduate School - New Brunswick Electronic Theses and Dissertations
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doi:10.7282/T34J0F8T
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ETD graduate
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The author owns the copyright to this work
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Open
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Montemarano
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John
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John Montemarano
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Rutgers University. Graduate School - New Brunswick
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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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