Corrosion behavior and flexural performance of reinforced concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under sustained loading and shrinkage cracking

Lijun Hou, Bingxuan Zhou, Shang Guo, Farhad Aslani, Da Chen

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1 Citations (Scopus)

Abstract

This paper presents an experimental study of the corrosion behavior of reinforced concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under simultaneous loading and shrinkage cracking, and of the flexural performance of these beams after corrosion. During corrosion, a two-stage corrosion test was applied – wet/dry cycles of chloride solution first and then accelerated corrosion using impressed current. Corrosion potential in the first corrosion stage and corrosion electrical resistance and corrosion pattern in the accelerated corrosion stage were measured, and rebar corrosion appearance was observed after bending tests. The results indicated that the corrosion potential decreased rapidly after exposure to chloride solution while the corrosion electrical resistance increased with corrosion time. No corrosion-induced longitudinal cracks occurred at corrosion levels up to 16.32%, but severe pitting corrosion of reinforcement was observed at transverse cracks. The load-carrying capacity, deformation, ductility, and flexural crack pattern of corroded RC/UHTCC beams were degraded greatly due to pitting corrosion effect. Ductile concrete crushing failure mode was transformed to brittle rebar rupture failure mode. The sustained loading action further aggravated the degradation in flexural capacity of corroded RC/UHTCC beams.
LanguageEnglish
Pages278-287
JournalConstruction and Building Materials
Volume198
DOIs
Publication statusPublished - 20 Feb 2019

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Toughness
Reinforced concrete
Corrosion
Composite materials
Acoustic impedance
Pitting
Cracks
Failure modes
Chlorides
Bending tests
Crushing
Load limits
Ductility
Reinforcement

Cite this

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title = "Corrosion behavior and flexural performance of reinforced concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under sustained loading and shrinkage cracking",
abstract = "This paper presents an experimental study of the corrosion behavior of reinforced concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under simultaneous loading and shrinkage cracking, and of the flexural performance of these beams after corrosion. During corrosion, a two-stage corrosion test was applied – wet/dry cycles of chloride solution first and then accelerated corrosion using impressed current. Corrosion potential in the first corrosion stage and corrosion electrical resistance and corrosion pattern in the accelerated corrosion stage were measured, and rebar corrosion appearance was observed after bending tests. The results indicated that the corrosion potential decreased rapidly after exposure to chloride solution while the corrosion electrical resistance increased with corrosion time. No corrosion-induced longitudinal cracks occurred at corrosion levels up to 16.32{\%}, but severe pitting corrosion of reinforcement was observed at transverse cracks. The load-carrying capacity, deformation, ductility, and flexural crack pattern of corroded RC/UHTCC beams were degraded greatly due to pitting corrosion effect. Ductile concrete crushing failure mode was transformed to brittle rebar rupture failure mode. The sustained loading action further aggravated the degradation in flexural capacity of corroded RC/UHTCC beams.",
author = "Lijun Hou and Bingxuan Zhou and Shang Guo and Farhad Aslani and Da Chen",
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doi = "10.1016/j.conbuildmat.2018.11.237",
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T1 - Corrosion behavior and flexural performance of reinforced concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under sustained loading and shrinkage cracking

AU - Hou, Lijun

AU - Zhou, Bingxuan

AU - Guo, Shang

AU - Aslani, Farhad

AU - Chen, Da

PY - 2019/2/20

Y1 - 2019/2/20

N2 - This paper presents an experimental study of the corrosion behavior of reinforced concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under simultaneous loading and shrinkage cracking, and of the flexural performance of these beams after corrosion. During corrosion, a two-stage corrosion test was applied – wet/dry cycles of chloride solution first and then accelerated corrosion using impressed current. Corrosion potential in the first corrosion stage and corrosion electrical resistance and corrosion pattern in the accelerated corrosion stage were measured, and rebar corrosion appearance was observed after bending tests. The results indicated that the corrosion potential decreased rapidly after exposure to chloride solution while the corrosion electrical resistance increased with corrosion time. No corrosion-induced longitudinal cracks occurred at corrosion levels up to 16.32%, but severe pitting corrosion of reinforcement was observed at transverse cracks. The load-carrying capacity, deformation, ductility, and flexural crack pattern of corroded RC/UHTCC beams were degraded greatly due to pitting corrosion effect. Ductile concrete crushing failure mode was transformed to brittle rebar rupture failure mode. The sustained loading action further aggravated the degradation in flexural capacity of corroded RC/UHTCC beams.

AB - This paper presents an experimental study of the corrosion behavior of reinforced concrete/ultrahigh toughness cementitious composite (RC/UHTCC) beams under simultaneous loading and shrinkage cracking, and of the flexural performance of these beams after corrosion. During corrosion, a two-stage corrosion test was applied – wet/dry cycles of chloride solution first and then accelerated corrosion using impressed current. Corrosion potential in the first corrosion stage and corrosion electrical resistance and corrosion pattern in the accelerated corrosion stage were measured, and rebar corrosion appearance was observed after bending tests. The results indicated that the corrosion potential decreased rapidly after exposure to chloride solution while the corrosion electrical resistance increased with corrosion time. No corrosion-induced longitudinal cracks occurred at corrosion levels up to 16.32%, but severe pitting corrosion of reinforcement was observed at transverse cracks. The load-carrying capacity, deformation, ductility, and flexural crack pattern of corroded RC/UHTCC beams were degraded greatly due to pitting corrosion effect. Ductile concrete crushing failure mode was transformed to brittle rebar rupture failure mode. The sustained loading action further aggravated the degradation in flexural capacity of corroded RC/UHTCC beams.

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SN - 0950-0618

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