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CFRP repair of concrete beams aged by accelerated corrosion.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	CFRP repair of concrete beams aged by accelerated corrosion./
Author:	Parish, George C.
Description:	1 online resource (638 pages)
Notes:	Source: Masters Abstracts International, Volume: 71-04.
Contained By:	Masters Abstracts International71-04.
Subject:	Civil engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9781109420579

CFRP repair of concrete beams aged by accelerated corrosion.
Parish, George C.

CFRP repair of concrete beams aged by accelerated corrosion. - 1 online resource (638 pages)

Source: Masters Abstracts International, Volume: 71-04.

Thesis (M.S.)--West Virginia University, 2008.

Includes bibliographical references

In 2006, the Federal Highway Administration statistics showed that approximately one out of every 13 reinforced concrete bridges in the USA is structurally deficient. As infrastructure continues to age and deteriorate, there will not be sufficient funds to replace every deficient bridge. Therefore, effective and durable repair methods must be developed and implemented. In this research, an experimental study is presented to determine both the short- and long-term efficiencies of concrete retrofit with externally-bonded carbon fiber reinforced polymer (CFRP) fabrics. The primary objective is to determine effective concrete-repair and CFRP-retrofit approaches for rehabilitation of deteriorated concrete bridge girders, based on potential for long-term durability and costs. This two-part study consisted of 35 large-scale reinforced concrete beam specimens. Part I consisted of 14 beams with dimensions 6x8x108" and Part II consisted of 21 beams with dimensions 6x8x78". The beams were cast using chloride contaminated, low-strength and highly porous concrete; and they were aged using an induced electric current technique. Supplementary tests were also conducted on specimens and materials, including cylinder compression, rebound hammer, ultrasonic pulse velocity, FRP-concrete pull-off, FRP direct tension, and crack measurement. In Part I two substrate repair methods were compared, epoxy crack-injection and complete replacement of concrete cover using polymer-modified concrete, and long-term durability was studied by inducing additional corrosion after repair. In Part II the performance of three unique FRP anchorage schemes were compared under both static and cyclic loading. Scheme 1 consisted of only flexural FRP without anchors, scheme 2 consisted of only two strategically placed anchors on each beam, and scheme 3 consisted of eight anchors evenly spaced along each span. In Part I, it was found that polymer concrete patch repair with corrosion inhibitors was by far the most durable substrate repair method, although all beams experienced further deterioration and loss in strength upon additional corrosion. In Part II, there were not significant differences in load capacity, deflection, or stiffness among the three anchoring schemes. The fatigue cyclic loading affected the failure mode of the beams. The accelerated corrosion process used in this research was adjusted using trial beam samples, and became successful and dependable in producing consistently artificially-aged specimens. This research provided further insight into future bridge rehabilitation and contributed to practical guidelines for concrete patch-repair and CFRP retrofit of concrete girders, to assure long-term adequate performance under environmental and mechanical loads.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9781109420579Subjects--Topical Terms:

561339
Civil engineering.
Index Terms--Genre/Form:

554714
Electronic books.

CFRP repair of concrete beams aged by accelerated corrosion.
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500 $a Source: Masters Abstracts International, Volume: 71-04.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Davalos, Julio F.;Ray, Indrajit.
502 $a Thesis (M.S.)--West Virginia University, 2008.
504 $a Includes bibliographical references
520 $a In 2006, the Federal Highway Administration statistics showed that approximately one out of every 13 reinforced concrete bridges in the USA is structurally deficient. As infrastructure continues to age and deteriorate, there will not be sufficient funds to replace every deficient bridge. Therefore, effective and durable repair methods must be developed and implemented. In this research, an experimental study is presented to determine both the short- and long-term efficiencies of concrete retrofit with externally-bonded carbon fiber reinforced polymer (CFRP) fabrics. The primary objective is to determine effective concrete-repair and CFRP-retrofit approaches for rehabilitation of deteriorated concrete bridge girders, based on potential for long-term durability and costs. This two-part study consisted of 35 large-scale reinforced concrete beam specimens. Part I consisted of 14 beams with dimensions 6x8x108" and Part II consisted of 21 beams with dimensions 6x8x78". The beams were cast using chloride contaminated, low-strength and highly porous concrete; and they were aged using an induced electric current technique. Supplementary tests were also conducted on specimens and materials, including cylinder compression, rebound hammer, ultrasonic pulse velocity, FRP-concrete pull-off, FRP direct tension, and crack measurement. In Part I two substrate repair methods were compared, epoxy crack-injection and complete replacement of concrete cover using polymer-modified concrete, and long-term durability was studied by inducing additional corrosion after repair. In Part II the performance of three unique FRP anchorage schemes were compared under both static and cyclic loading. Scheme 1 consisted of only flexural FRP without anchors, scheme 2 consisted of only two strategically placed anchors on each beam, and scheme 3 consisted of eight anchors evenly spaced along each span. In Part I, it was found that polymer concrete patch repair with corrosion inhibitors was by far the most durable substrate repair method, although all beams experienced further deterioration and loss in strength upon additional corrosion. In Part II, there were not significant differences in load capacity, deflection, or stiffness among the three anchoring schemes. The fatigue cyclic loading affected the failure mode of the beams. The accelerated corrosion process used in this research was adjusted using trial beam samples, and became successful and dependable in producing consistently artificially-aged specimens. This research provided further insight into future bridge rehabilitation and contributed to practical guidelines for concrete patch-repair and CFRP retrofit of concrete girders, to assure long-term adequate performance under environmental and mechanical loads.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Civil engineering. $3 561339
650 4 $a Materials science. $3 557839
655 7 $a Electronic books. $2 local $3 554714
690 $a 0543
690 $a 0794
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a West Virginia University. $3 1187945
773 0 $t Masters Abstracts International $g 71-04.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1471362 $z click for full text (PQDT)