An experimental assessment of corrosion damage and bending capacity reduction of singly reinforced concrete beams subjected to accelerated corrosion

Nasser, Hussein; Steen, Charlotte Van; Verstrynge, Els

doi:10.1016/j.conbuildmat.2021.122773

Cited by 38 publications

(19 citation statements)

References 31 publications

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“…Specimen preparation A series of RC beams with dimensions 150×200×1800 mm 3 were cast 15 . They were reinforced with one smooth or ribbed rebar and corroded up to three target corrosion levels.…”

Section: Accelerated Corrosion Of Rc Beamsmentioning

confidence: 99%

“…A series of RC beams with dimensions 150 × 200 × 1800 mm 3 were cast. 15 They were reinforced with one smooth or ribbed rebar and corroded up to three target corrosion levels. Two beams with a target corrosion level of 10% mass loss and reinforced with a ribbed rebar having a nominal diameter of 14 mm, referred to as B10R1 and B10R2, were monitored during the initial weeks of the corrosion process with the AE technique and will be discussed in this article (see Table 2).…”

Section: Experimental Test Programmementioning

confidence: 99%

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Acoustic emission source characterisation of chloride-induced corrosion damage in reinforced concrete

Steen

Nasser

Verstrynge

et al. 2021

Structural Health Monitoring

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Worldwide, asset managers are struggling with the management of ageing infrastructure in reinforced concrete. Early detection of reinforcement corrosion, which is generally considered as the major problem, can help to perform dedicated maintenance and repair. The acoustic emission technique is promising to reach this goal. However, research on the characterisation of the different damage sources during corrosion in reinforced concrete remains scarce. In this article, the characterisation of damage processes is investigated on small reinforced concrete prisms and upscaled to reinforced concrete beams under accelerated conditions in a laboratory environment. Damage sources are assigned based on careful validation with crack width measurements and dummy samples. Signals originating from different acoustic emission sources are compared in the time and frequency domain. Moreover, the continuous wavelet transform is applied to provide information on time–frequency characteristics. The results show that the moment of concrete macro-cracking can be derived from a sudden increase of the cumulative acoustic emission events and cumulative acoustic emission energy. However, validation with crack measurements is required. The shift in both peak and centre frequency of the acoustic emission signals is found to be a better indicator. Wavelet transform allows to distinguish acoustic emission sources when frequency ranges are overlapping. Possible acoustic emission sources such as the corrosion process and concrete cover cracking, are successfully assigned. The major contributions of this article are the characterisation of acoustic emission sources from corrosion damage in reinforced concrete, validation with crack measurements and dummy samples, as well as a dedicated wavelet analysis.

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Section: Accelerated Corrosion Of Rc Beamsmentioning

confidence: 99%

Section: Experimental Test Programmementioning

confidence: 99%

Acoustic emission source characterisation of chloride-induced corrosion damage in reinforced concrete

Steen

Nasser

Verstrynge

et al. 2021

Structural Health Monitoring

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show abstract

“…Pedrosa et al [16], Nasser et al [17], and Torres-Acosta et al [10] used samples with longitudinal rebars only, which cause longitudinal cracks. In real structures, beams are also reinforced with stirrups, which can also corrode and cause transverse cracks.…”

Section: List Of Symbolsmentioning

confidence: 99%

Effect of pre-existing longitudinal and transverse corrosion cracks on the flexural behaviour of corroded RC beams

Nasser

Verstrynge

2022

Construction and Building Materials

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“…A schematic representation of the setup is shown in Figure 13. More details on the corrosion setup can be found in Nasser et al [10] and Van Steen et al [22]. The same AMSY-6 Vallen acquisition system with six channels was used.…”

Section: Upscaling To Rc Beamsmentioning

confidence: 99%

“…These three mechanisms affect the eventual load-bearing capacity of RC components and structures. A reduction in bending capacity as well as changes in failure mechanism from flexural to bond are reported [10,11]. Rupture of the rebar is possible at high corrosion levels due to the formation of deep pits.…”

Section: Introductionmentioning

confidence: 96%

Degradation Monitoring in Reinforced Concrete with 3D Localization of Rebar Corrosion and Related Concrete Cracking

Steen

Verstrynge

2021

Applied Sciences

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Corrosion of the reinforcement is a major degradation mechanism affecting durability and safety of reinforced concrete (RC) structures. As the corrosion process starts internally, it can take years before visual damage can be noticed on the surface, resulting in an overall degraded condition and leading to large financial costs for maintenance and repair. The acoustic emission (AE) technique enables the continuous monitoring of the progress of internal cracking in a non-invasive way. However, as RC is a heterogeneous material, reliable damage detection and localization remains challenging. This paper presents extensive experimental research aiming at localizing internal damage in RC during the corrosion process. Results of corrosion damage monitoring with AE are presented and validated on three sample scales: small mortar samples (scale 1), RC prisms (scale 2), and RC beams (scale 3). For each scale, the corrosion process was accelerated by imposing a direct current. It is found that the AE technique can detect damage earlier than visual inspection. However, dedicated filtering is necessary to reliably localize AE events. Therefore, AE signals were filtered by a newly developed post-processing protocol which significantly improves the localization results. On the smallest scale, results were confirmed with 3D micro-CT imaging, whereas on scales 2 and 3, results were compared with surface crack width measurements and resulting rebar corrosion levels.

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An experimental assessment of corrosion damage and bending capacity reduction of singly reinforced concrete beams subjected to accelerated corrosion

Cited by 38 publications

References 31 publications

Acoustic emission source characterisation of chloride-induced corrosion damage in reinforced concrete

Acoustic emission source characterisation of chloride-induced corrosion damage in reinforced concrete

Effect of pre-existing longitudinal and transverse corrosion cracks on the flexural behaviour of corroded RC beams

Degradation Monitoring in Reinforced Concrete with 3D Localization of Rebar Corrosion and Related Concrete Cracking

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