Severely Corroded RC with Cover Cracking

Coronelli, Dario; Zandi, Kamyab; Lundgren, Karin

doi:10.1061/(asce)st.1943-541x.0000633

Cited by 96 publications

(49 citation statements)

References 20 publications

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“…This finding agrees with the research by Andrade, Alonso and Olina (1993) who discovered that for the same corrosion level with low corrosion rates, larger crack widths would appear on concrete surfaces. However, this is contradictory to results reported by Coronelli, Zandi, Lundgren, and Rossi (2011); they indicated that the slower the corrosion rate, the smaller the crack widths, which appears reasonable as a smaller corrosion rate allows for corrosion products to flow out through cracks, thereby reducing splitting pressure. Obviously, other effects may act in the opposite direction in these specimens.…”

Section: Comparison To Results From the Literaturecontrasting

confidence: 81%

“…The values presented in Figure 16 correspond to the same data as in Figure 15, but corrected using the aforementioned expression. It is worth pointing out that the amount of transverse reinforcement is not included as a factor; in a study by Coronelli, Zandi and Lundgren (2013), it is shown that the transverse reinforcement, either corroding or not, reduces the width of cracks caused by the corrosion of the main bars -a possible explanation for the rather large scatter in the results. Thus, if the corrosion level could be estimated based on the measured crack widths from results of artificially corroded specimens, the corrosion level in the naturally corroded specimens would be greatly overestimated, even when applying the correction factor to include the geometrical and material properties.…”

Section: Comparison To Results From the Literaturementioning

confidence: 99%

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Investigating correlations between crack width, corrosion level and anchorage capacity

Tahershamsi

Fernandez

Lundgren

et al. 2016

Structure and Infrastructure Engineering

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Section: Comparison To Results From the Literaturecontrasting

confidence: 81%

Section: Comparison To Results From the Literaturementioning

confidence: 99%

Investigating correlations between crack width, corrosion level and anchorage capacity

Tahershamsi

Fernandez

Lundgren

et al. 2016

Structure and Infrastructure Engineering

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“…This results in 20 different cases with stirrups (for consideration in the verification) and four without. Figure 7: a) side view of beam with the studied cross section and embedment length indicated (not to scale) adopted from [34]. b) cross-section of the beam in the end anchorage region with width and concrete cover indicated.…”

Section: Deterministic Assessment Of Anchorages and Set-up Of Reliabimentioning

confidence: 99%

Partial safety factors for the anchorage capacity of corroded reinforcement bars in concrete

Blomfors

Ivanov

Honfí

et al. 2019

Engineering Structures

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al (2018) Partial safety factors for the anchorage capacity of corroded reinforcement bars in concrete Engineering Structures, 181: 579-588 http://dx. ABSTRACTMany reinforced concrete bridges in Europe and around the world are damaged by reinforcement corrosion and the annual maintenance costs are enormous. It is therefore important to develop reliable methods to assess the structural capacity of corroded reinforced concrete structures and avoid unnecessary maintenance costs. Although there are advanced models for determining the load carrying capacity of structures, it is not obvious how they should be used to verify the performance of existing structures. To confidently assess the bond of corroded reinforcement in concrete, for example, the calculation model must give a sufficient safety margin. When designing new structures, semi-probabilistic approaches (such as the partial safety factor method) are adopted to achieve the target reliabilities specified in structural design codes. This paper uses probabilistic methods to develop partial factors for application in an existing bond model, to assess the safety of corroded reinforced concrete structures. The response of the bond model was studied using Monte Carlo (MC) simulations for several design cases, with probability distributions fitted to the results. Partial factors were then derived, based on these distributions. Furthermore, an MC-based simulation technique called "importance sampling" was used to study the reliability of several deterministic bond assessments conducted using these partial factors. The results show that deterministic assessments which use the proposed partial factors lead to a safety level at least equal to the target value. The results presented in this paper will support the assessment of reinforced concrete structures with anchorage problems and give a reasonable approximation of the anchorage capacity with sufficient safety margin. When generalised to cover other failure modes and structural configurations, this will enable better utilisation of damaged structures and lead to major environmental and economical savings for society. 1.

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“…Numerous studies have investigated the parameters that may influence the bond and anchorage capacity of corroded reinforced concrete (for the latest findings see work by Coronelli et al (2013), Regan and Kennedy Reid (2010), Saether (2011) and Zandi Hanjari et al (2011b)). However, existing knowledge is mostly based on experimental investigations of specimens that have been subjected to accelerated corrosion, for example by application of impressed current density.…”

Section: Introductionmentioning

confidence: 99%

Anchorage of naturally corroded bars in reinforced concrete structures

Tahershamsi

Zandi

Lundgren

et al. 2014

Magazine of Concrete Research

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The bond properties of naturally corroded reinforced concrete members were experimentally investigated. Thirteen specimens were taken from the northern edge beam of Stallbacka Bridge, a girder bridge in Sweden. The specimens exhibited different levels of corrosion-induced damage, including concrete cracking and cover spalling. The damage was carefully documented and the specimens were tested in suspended four-point bending tests. Their general behaviour was monitored through measurements of applied loads and vertical deflections. At the same time, the local anchorage behaviour was recorded at the end regions. The test results showed around 5% lower anchorage capacity for damaged specimens compared with the reference ones. The residual bond strength was studied with respect to the observed damage. These tests, and artificial corrosion results from the literature, indicate that the bond strength decreased with increasing maximum splitting crack widths. However, the bond capacity was higher for the naturally corroded specimens. The results thus show an obvious difference between artificial and natural corrosion, and furthermore indicate that the provisions given in fib Model Code 2010 are on the safe side. These test results contribute to further knowledge regarding the structural behaviour of corroded reinforced concrete structures. Notation d effective cross-sectional height F t estimated tensile force in tensile bars f c compressive strength of cylindrical concrete specimen l a available anchorage length l s shear span length P applied single load from load cell ö main bar diameter

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Severely Corroded RC with Cover Cracking

Cited by 96 publications

References 20 publications

Investigating correlations between crack width, corrosion level and anchorage capacity

Investigating correlations between crack width, corrosion level and anchorage capacity

Partial safety factors for the anchorage capacity of corroded reinforcement bars in concrete

Anchorage of naturally corroded bars in reinforced concrete structures

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