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Modeling of concrete cracking due to...

Aligizaki, Kalliopi K.

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Modeling of concrete cracking due to corrosion of embedded reinforcement.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Modeling of concrete cracking due to corrosion of embedded reinforcement./
Author:	Aligizaki, Kalliopi K.
Description:	166 p.
Notes:	Source: Dissertation Abstracts International, Volume: 60-07, Section: B, page: 3425.
Contained By:	Dissertation Abstracts International60-07B.
Subject:	Engineering, Civil. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9937915
ISBN:	9780599392113

Modeling of concrete cracking due to corrosion of embedded reinforcement.
Aligizaki, Kalliopi K.

Modeling of concrete cracking due to corrosion of embedded reinforcement. - 166 p.

Source: Dissertation Abstracts International, Volume: 60-07, Section: B, page: 3425.

Thesis (Ph.D.)--The Pennsylvania State University, 1999.

Corrosion of steel in concrete continues freely after concrete cracks, because concrete does not provide even physical protection to steel any more. In this Thesis, the effects of concrete quality and design parameters on concrete cracking due to corrosion of embedded reinforcement are examined. The parameters tested are concrete strength, thickness of concrete cover, diameter of steel bar, crack width at the concrete surface, the presence of polypropylene fibers, and corrosion occurring at a limited length. Four air-entrained concrete mixtures were proportioned having different water-cement ratios (0.40, 0.45, 0.50 and 0.55). The control mixture was selected according to the classifications used by the Eurocode and to represent concrete used in a marine environment. An additional mixture was proportioned containing polypropylene fibers. A total of 148 reinforced concrete specimens (250 x 140 x 140 mm) containing one ribbed steel bar were prepared in the laboratory. Corrosion of the reinforcing steel bars was accelerated by two ways: (a) by adding NaCl in the initial concrete mixtures in an amount of 3.7% by mass of cement, and (b) by anodically charging the steel bar with a current density of 500 mA/m2. Different electrochemical tests were carried out before anodically charging the steel bars and after concrete cracked due to corrosion of embedded reinforcement, in order to determine various electrochemical parameters. After the concrete specimens cracked, the average crack width at the concrete surface and the iron mass loss were determined. A theoretical model is proposed and is used as the basis for developing the final analytical equation. A polynomial regression analysis was carried out in order to relate the parameters tested in this study to the amount of oxides needed to cause cracking of the concrete cover. For the parameters examined and the assumptions made, the analysis indicates that the model proposed explains 30% of the variation of the iron mass loss needed to cause cracking in concrete. The model proposed in this study is also compared to the models proposed in the past by other researchers.

ISBN: 9780599392113Subjects--Topical Terms:

783781
Engineering, Civil.

Modeling of concrete cracking due to corrosion of embedded reinforcement.
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500 $a Source: Dissertation Abstracts International, Volume: 60-07, Section: B, page: 3425.
500 $a Advisers: Philip D. Cady; Digby D. Macdonald.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 1999.
520 $a Corrosion of steel in concrete continues freely after concrete cracks, because concrete does not provide even physical protection to steel any more. In this Thesis, the effects of concrete quality and design parameters on concrete cracking due to corrosion of embedded reinforcement are examined. The parameters tested are concrete strength, thickness of concrete cover, diameter of steel bar, crack width at the concrete surface, the presence of polypropylene fibers, and corrosion occurring at a limited length. Four air-entrained concrete mixtures were proportioned having different water-cement ratios (0.40, 0.45, 0.50 and 0.55). The control mixture was selected according to the classifications used by the Eurocode and to represent concrete used in a marine environment. An additional mixture was proportioned containing polypropylene fibers. A total of 148 reinforced concrete specimens (250 x 140 x 140 mm) containing one ribbed steel bar were prepared in the laboratory. Corrosion of the reinforcing steel bars was accelerated by two ways: (a) by adding NaCl in the initial concrete mixtures in an amount of 3.7% by mass of cement, and (b) by anodically charging the steel bar with a current density of 500 mA/m2. Different electrochemical tests were carried out before anodically charging the steel bars and after concrete cracked due to corrosion of embedded reinforcement, in order to determine various electrochemical parameters. After the concrete specimens cracked, the average crack width at the concrete surface and the iron mass loss were determined. A theoretical model is proposed and is used as the basis for developing the final analytical equation. A polynomial regression analysis was carried out in order to relate the parameters tested in this study to the amount of oxides needed to cause cracking of the concrete cover. For the parameters examined and the assumptions made, the analysis indicates that the model proposed explains 30% of the variation of the iron mass loss needed to cause cracking in concrete. The model proposed in this study is also compared to the models proposed in the past by other researchers.
590 $a School code: 0176.
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773 0 $t Dissertation Abstracts International $g 60-07B.
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856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9937915