Versuchstechnische Untersuchungen zu Korrosionsschäden an Winkelstützmauern

Rebhan, Matthias; Vorwagner, Alois; Burtscher, Stefan L.; Kwapisz, Maciej; Marte, Roman

doi:10.1002/best.201900073

Cited by 4 publications

(15 citation statements)

References 2 publications

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“…Further examples of this subject and a complete de scription of the content of risk management can be found in [3] and [8].…”

Section: Discussionmentioning

confidence: 99%

“…Examination of the available data on retaining structures in Austria [3] shows that there are a total of about 140,000 retaining structures in the entire area of the country (84,000 km 2 ) on the main road network with about 36,500 km of autobahns and expressways as well as fed eral and state roads and in the about 100,000 km of minor roads (council roads). This number is further increased by retaining structures in private ownership (e.g.…”

Section: 1 Existing Structuresmentioning

confidence: 99%

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Long‐term experiences for the safety Assessment of exisiting retaining structures in Styria

Nöhrer¹,

Rebhan

Saurug³

et al. 2019

Geomechanics and Tunnelling

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The road network of the Austrian state of Styria, comprises of about 5,000 retaining structures along a total distance of about 5,100 km. In order to be able to carry out a useful and efficient inspection methode to this number of structures, a risk management (priority management) concept has been developed in collaboration with a university. This is based on the recording of significant parameters regarding the stability of these structures. In addition, the damage potential resulting from a failure of a structure is given, which enables an estimation of the associated risk. These documents can also be used as a design basis or for the determination of necessary inspection measures. The approach presented here is the first version of this concept for existing retaining structures in the state road network and is currently in a phase of trial and validation.

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“…Further examples of this subject and a complete de scription of the content of risk management can be found in [3] and [8].…”

Section: Discussionmentioning

confidence: 99%

Section: 1 Existing Structuresmentioning

confidence: 99%

Long‐term experiences for the safety Assessment of exisiting retaining structures in Styria

Nöhrer¹,

Rebhan

Saurug³

et al. 2019

Geomechanics and Tunnelling

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“…Cantilever retaining walls are examples of structures where unnoticed corrosion of the underground part can lead to catastrophic failures. A RC cantilever wall collapsed in Austria without prior warning and, sadly, caused a casualty [4][5][6]. By now, it is well documented that the reinforcing steel at the lower end of the backside (facing the soil) of cantilever retaining walls near the foundation can corrode.…”

Section: Importance Of Corrosion Inspection Of Buried Structural Memb...mentioning

confidence: 99%

“…By now, it is well documented that the reinforcing steel at the lower end of the backside (facing the soil) of cantilever retaining walls near the foundation can corrode. This corrosion-related problem can be explained by inappropriate construction practices approximately 50 years ago [5] when many of the currently still existing retaining walls were built. During construction, insufficient quality control increased the risk of gaps and honeycombs at the joint between the foundation and the wall, leaving the reinforcing steel exposed directly to the soil or backfill environment [7].…”

Section: Importance Of Corrosion Inspection Of Buried Structural Memb...mentioning

confidence: 99%

“…Corrosion at this location presents a twofold problem: First, as mentioned above, inspecting this part of the structure is virtually impossible (or can only be done as random spot-checks with high inspection costs). Second, this location in the structure is often the most critical, as corrosion-related degradation of the reinforcing steel in this section can cause sudden wall failure [5,8] or increase the risk of such a failure [9].…”

Section: Importance Of Corrosion Inspection Of Buried Structural Memb...mentioning

confidence: 99%

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Inspecting the corrosion state of underground reinforced concrete structures

Pfändler

Bircher

Angst

2022

J Infrastruct Preserv Resil

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Unnoticed corrosion in underground reinforced concrete structural members – such as foundations, retaining walls, or piles – may severely threaten the integrity of structures. However, condition assessment of the ground-buried structural parts is challenging, because the areas of interest are hardly accessible for visual inspection or non-destructive testing. An example of particular practical relevance is reinforcement corrosion at the back-side of the lower end of cantilever retaining walls, near the construction joint between stem and heel of the base slab. The collapse of a cantilever retaining wall in Austria was a tragic reminder of the dangers of unnoticed corrosion. The drawback of current inspection methods is that they are laborious and costly, but still, only a tiny fraction of the structure can be inspected. Considering that the degree of corrosion can vary significantly along a structure, such local information includes a risk that corrosion elsewhere remains undetected.A novel inspection system is proposed here, combining the well-proven half-cell potential measurement technique with steered horizontal underground drilling technologies. With this approach, a tailor-made probe is brought in proximity to the concrete surface in the soil and electrochemical measurements are performed to characterize the corrosion condition. The main advantage is that virtually the entire length of the structure can be inspected, thus overcoming the limitations of highly local inspection. Moreover, the proposed technique includes a method to constantly monitor the functionality of the potential measuring probe, based on electrical resistance measurements. The feasibility of the approach was confirmed in laboratory experiments on a mortar block in soil. These findings were confirmed in a field experiment. The results suggest that local corroding zones of practice-relevant size can be detected for a distance between the reference electrode and the steel surface of at least 25 cm. On the basis of this work, underground corrosion inspection of cantilever retaining walls is considered feasible, and the development of similar technologies as the one proposed here may in the future considerably enhance condition assessment of structures buried in the ground.

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Assessment of corrosion attack morphology on reinforced concrete structures exposed to chlorides

Yilmaz,

Rossi,

Angst

2024

Structural Concrete

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Chloride‐induced corrosion of the reinforcement steel is the main degradation mechanism for reinforced concrete, considerably affecting the load and deformation capacity of structures. Despite its importance, there is limited knowledge about the morphology of corrosion attacks and accordingly, relatively crude assumptions are generally made when considering corrosion in structural analyses. Improved understanding could reduce maintenance costs and extend the service life of structures. This study presents a systematic documentation and analysis of more than 600 corrosion attack morphologies, both from observations on actual engineering structures and from laboratory specimens (X‐ray computed tomography data from previous studies). Findings reveal that corrosion attacks—regardless of age, concrete type, or whether occurring in structures or laboratory specimens—without exception grow laterally and longitudinally along the reinforcement bar, rather than in depth. This shallow morphology deviates from the conventional description of pitting corrosion in the literature. Therefore, we propose using the term ‘corrosion attack’ instead of ‘corrosion pit’ for better differentiation. We discuss different mechanism that may lead to this growth pattern. Moreover, implications for the consideration of corrosion in structural analysis are assessed. A comprehensive database of the documented corrosion attacks is provided to enhance existing service life models, offering substantial data for probabilistic modeling of input parameters.

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Versuchstechnische Untersuchungen zu Korrosionsschäden an Winkelstützmauern

Cited by 4 publications

References 2 publications

Long‐term experiences for the safety Assessment of exisiting retaining structures in Styria

Long‐term experiences for the safety Assessment of exisiting retaining structures in Styria

Inspecting the corrosion state of underground reinforced concrete structures

Assessment of corrosion attack morphology on reinforced concrete structures exposed to chlorides

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