Effects of steel reinforcement corrosion on carbon-fibre-reinforced polymer repaired slabs

Zhuang, Ning; Zhou, Yujue; Sun, Haodong

doi:10.1680/stbu.14.00105

Cited by 6 publications

(6 citation statements)

References 17 publications

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“…Half-cell potential measurements are one of the most widely used nondestructive methods to monitor and assess steel bar corrosion in concrete structures [21,22]. It is generally agreed that the half-cell potential measurements can be interpreted according to ASTM C 876-80 [23] in Table 3.…”

Section: Corrosion Potentialmentioning

confidence: 99%

Corrosion Activity on CFRP-Strengthened RC Piles of High-Pile Wharf in a Simulated Marine Environment

Zhuang

Zhou

et al. 2017

Advances in Materials Science and Engineering

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We report test results from an experimental study to investigate the effectiveness of carbon fiber-reinforced polymer (CFRP) against reinforcing steel bar corrosion. Twelve reinforced-concrete pile specimens of 180 mm square by 1,600 mm long were cast. Three pile specimens were corroded to 5% steel mass loss and then strengthened with CFRP sheets; four specimens were strengthened by using CFRP sheets, whereas the remaining five specimens were not strengthened. The specimens were placed in a simulated marine environment, and corrosion was induced by an impressed current technique. At different theoretical corrosion degrees, nondestructive tests were performed to investigate the corrosion activity of the pile specimens, and destructive tests were performed to determine reinforcing steel bar mass loss. Based on the findings, the effectiveness of the CFRP-strengthened RC piles under aggressive marine environmental conditions was established.

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Section: Corrosion Potentialmentioning

confidence: 99%

Corrosion Activity on CFRP-Strengthened RC Piles of High-Pile Wharf in a Simulated Marine Environment

Zhuang

Zhou

et al. 2017

Advances in Materials Science and Engineering

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“…Given the complex nature of RC construction methods, which require the use of heavy equipment, conventional reinforcement techniques are not appropriate. Carbon fiber-reinforced polymer (CFRP) products, which have a number of advantages (such as corrosion resistance, favorable strength-to-weight ratio, durability in adverse environments, and ease of application), have been widely accepted as new effective technologies for restoring or improving the performance of RC structures [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Aged and Seriously Damaged RC Beams Strengthened Using CFRP Composites

Zhuang

Dong

Chen

et al. 2018

Advances in Materials Science and Engineering

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This paper presents results from experiments on aged and seriously damaged reinforced concrete (RC) beams strengthened with different arrangements of external carbon fiber-reinforced polymer (CFRP) laminates and end anchorages. Seven RC beams from an old bridge, measuring 250 × 200 × 2300 mm, were tested. All specimens were loaded to yield load to evaluate initial mechanical properties. Then, these seriously damaged specimens were repaired using different CFRP-reinforcing schemes and reloaded to failure. The yield load growth due to CFRP reinforcement ranged from 5% to 36%. Different parameters including CFRP dimension and position, bonding length, and end anchorage were investigated and facilitated conclusions on beam ductility, load-midspan deflection response, and failure mode. This research contributes to knowledge about the CFRP repair of aged and seriously damaged beams to ensure better performance in overloaded conditions.

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“…The fourth paper by Zhuang et al (2016) reports an experimental investigation on reinforced-concrete slabs strengthened with carbon-fibre-reinforced polymer (CFRP) sheets and exposed to a corrosive environment. The nine slabs tested are designed with different clear concrete covers and main longitudinal bar diameters.…”

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confidence: 99%

Editorial

Ashour¹

2016

Proceedings of the Institution of Civil Engineers - Structures

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and the UK, demonstrating the international reach of the journal.The first paper by Johnston et al. (2016) describes a full-scale site fire test performed on a cold-formed steel portal frame building with semi-rigid joints, complemented with finiteelement modelling. The total length of the building was 10 m, comprising five frames spaced at 2·5 m. Each frame had a span of 8 m, height to eaves of 2·2 m and pitch of 10°. The fire test was carried out by several international experts from four research institutions, namely Queen's University Belfast, Curtin University, University of Strathclyde and Ecosteel, benefitting from unique fire testing facilities at Curtin University, Malaysia. In the full-scale fire test, the building collapsed asymmetrically at a temperature of 714°C. The paper also presents the development of a non-linear elasto-plastic finiteelement shell model for the building in fire. After model validation against the results of the full-scale fire test, a comprehensive parametric study is conducted, highlighting the importance of in-plane restraint from the side rails in preventing an outwards sway failure for both a single portal and full building geometry model. The study also demonstrates the importance of modelling the semi-rigidity of various joints in design.In the second paper, Behnam and Ronagh (2016) investigate the post-earthquake fire resistance of a two-bay reinforcedconcrete portal frame. Following a post-earthquake firewall break down, the paper computationally assesses three fire exposure scenarios: only the left part of the frame exposed, only the right part of the frame exposed and the entire frame exposed. Two action scenarios are also considered; the frame is first pushed to displacement corresponding to the life safety level of performance based on FEMA356 code, followed by a natural fire curve, whereas the second assumes a fire-alone analysis to provide a point of reference. The finite-element simulation shows that no failure occurs in any of the fire-alone scenarios, or when exposing the smaller part of the building to the post-earthquake fire, but exposing the larger part and the entire frame to post-earthquake fire causes frame collapse at around 50 min and 25 min, respectively. The investigation shows the importance of firewalls to reduce vulnerability of reinforced-concrete buildings in case of postearthquake fire.The third paper by Cairns and Goodchild (2016) reports on an experimental investigation into the performance of lapped steel joints in structural concrete. The paper considers the effect of three different parameters, namely concrete cover, proportion of bars lapped at a section and relative size of bars within a lapped pair. However, the main focus of the paper is to evaluate the reduction in lap strength where minimum concrete cover, as specified by Eurocode 2, is reduced below one bar diameter. The authors conclude that lap strength is decreased by approximately 12% when the bottom cover is reduced from 1·2 to 0·6 times bar diameter. It is also found that lap ...

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Effects of steel reinforcement corrosion on carbon-fibre-reinforced polymer repaired slabs

Cited by 6 publications

References 17 publications

Corrosion Activity on CFRP-Strengthened RC Piles of High-Pile Wharf in a Simulated Marine Environment

Corrosion Activity on CFRP-Strengthened RC Piles of High-Pile Wharf in a Simulated Marine Environment

Experimental Study of Aged and Seriously Damaged RC Beams Strengthened Using CFRP Composites

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