Cracking Behavior of CFRP Laminate-Strengthened RC Beams with Premechanical and Postmechanical Environmental Damage

Zhang, Dawei; Shen, Shijun; Zhao, Yongjun; Jin, Weiliang; Ueda, Tamon

doi:10.1061/(asce)cc.1943-5614.0000522

Cited by 12 publications

(2 citation statements)

References 20 publications

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“…In addition to above studies, some laboratory experiments have been conducted on newly cast specimens to investigate the mechanical properties of damaged beams [18,19]. For example, some experimental tests have investigated members strengthened with CFRP under preloading or precracking [20,21].…”

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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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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“…Besides, the effect of moisture diffusion on the adhesive bonding and chloride induced corrosion of the steel bar are also major causes of the deterioration of CFRP flexurally strengthened RC beams under marine environment [9][10][11]. The chloride diffusion in concrete was accelerated due to the defects of the RC beams caused by the actions of loads, environments, and climate conditions [12].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Chloride Penetration of Precracked Reinforced Concrete Beams with Externally Bonded CFRP Exposed to Marine Environment

Xie

Guan

Zhan

et al. 2016

International Journal of Polymer Science

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Cracked reinforced concrete (RC) beams can be repaired effectively by using externally bonded CFRP sheets. However, when the strengthened beams are subjected to marine environment, long-term performance will be affected by the material and the interface deterioration of concrete and CFRP. Therefore, to evaluate the service life of the strengthened beams, this study investigates the behavior of precracked RC beams strengthened with CFRP sheets exposed to marine environment. Accelerated ageing experiments were carried out by exposing specimens to cyclic wetting in sea water and drying in 40°C air for 3 months and 6 months, respectively. After the environment exposure, four-point bending test was conducted and then the diffusion of chlorides in the strengthened beams was analysed. The results show that the bonding behavior of the adhesive was weakened and the ductility of the strengthened beams was slightly reduced due to the marine environment. But there is no obvious strength difference between the strengthened beams suffered from marine environment for 3 months and 6 months. Besides, the precracks in the RC beams accelerated the chloride diffusion, while CFRP bonding reduced the chloride penetration. In addition, NEL method was employed to validate the effect of the cracks on chloride permeability. The results showed that the chloride diffusion coefficients increased with the depth of the cracks.

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Crack propagation and flexural behaviour of RC beams under simultaneous sustained loading and steel corrosion

Dong

Zhao

Wang

et al. 2017

Construction and Building Materials

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Cracking Behavior of CFRP Laminate-Strengthened RC Beams with Premechanical and Postmechanical Environmental Damage

Cited by 12 publications

References 20 publications

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

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

Mechanical Behavior and Chloride Penetration of Precracked Reinforced Concrete Beams with Externally Bonded CFRP Exposed to Marine Environment

Crack propagation and flexural behaviour of RC beams under simultaneous sustained loading and steel corrosion

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