Zum Ansatz eines kritischen Chloridgehaltes bei Stahlbetonbauwerken

Breit, Wolfgang; Dauberschmidt, Christoph; Gehlen, Christoph; Sodeikat, Christian; Taffe, Alexander; Wiens, Udo

doi:10.1002/best.201100007

Cited by 23 publications

(16 citation statements)

References 10 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The established approach in engineering for managing chloride-induced steel corrosion in concrete is based on a chloride threshold value (also termed critical chloride content, C crit ) 1 5 6 . According to this concept, corrosion initiation is thought to occur as soon as the chloride concentration in the concrete at the steel surface exceeds the C crit threshold.…”

Section: Introductionmentioning

confidence: 99%

Experimental Protocol to Determine the Chloride Threshold Value for Corrosion in Samples Taken from Reinforced Concrete Structures

Angst

Boschmann

Wagner

et al. 2017

JoVE

View full text Add to dashboard Cite

The aging of reinforced concrete infrastructure in developed countries imposes an urgent need for methods to reliably assess the condition of these structures. Corrosion of the embedded reinforcing steel is the most frequent cause for degradation. While it is well known that the ability of a structure to withstand corrosion depends strongly on factors such as the materials used or the age, it is common practice to rely on threshold values stipulated in standards or textbooks. These threshold values for corrosion initiation (Ccrit) are independent of the actual properties of a certain structure, which clearly limits the accuracy of condition assessments and service life predictions. The practice of using tabulated values can be traced to the lack of reliable methods to determine Ccrit on-site and in the laboratory.Here, an experimental protocol to determine Ccrit for individual engineering structures or structural members is presented. A number of reinforced concrete samples are taken from structures and laboratory corrosion testing is performed. The main advantage of this method is that it ensures real conditions concerning parameters that are well known to greatly influence Ccrit, such as the steel-concrete interface, which cannot be representatively mimicked in laboratory-produced samples. At the same time, the accelerated corrosion test in the laboratory permits the reliable determination of Ccrit prior to corrosion initiation on the tested structure; this is a major advantage over all common condition assessment methods that only permit estimating the conditions for corrosion after initiation, i.e., when the structure is already damaged.The protocol yields the statistical distribution of Ccrit for the tested structure. This serves as a basis for probabilistic prediction models for the remaining time to corrosion, which is needed for maintenance planning. This method can potentially be used in material testing of civil infrastructures, similar to established methods used for mechanical testing.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Protocol to Determine the Chloride Threshold Value for Corrosion in Samples Taken from Reinforced Concrete Structures

Angst

Boschmann

Wagner

et al. 2017

JoVE

View full text Add to dashboard Cite

show abstract

“…[ 13 ] However, according to the current state of the art, there is no analytical mathematical model that can be used to describe the redistribution of chloride in the coating after the application of a protective surface coating. The existing calculation approach according to Breit et al [ 5 ] for the description of the chloride penetration process cannot be applied because the boundary conditions change in the case of system sealing.…”

Section: Chloride Redistribution At Water Saturationmentioning

confidence: 99%

“…A prerequisite for chloride‐induced corrosion of steel in concrete is the achievement of a component‐specific, critical corrosion‐inducing chloride content [ 4–6 ] at the level of the reinforcement layer. The quantification of the chloride redistribution in concrete after the application of a surface protective coating is the first approach to evaluate the effectiveness of the repair principle W‐Cl and estimate the remaining service life after application of the method.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the effectiveness of the repair method 8.3 “Corrosion protection by increasing the electrical resistivity” in chloride‐containing concrete Part 2: Chloride redistribution in concrete after application of a system sealing surface protective coating

Celebi

Breit

2020

Materials & Corrosion

Self Cite

View full text Add to dashboard Cite

This DFG-funded research project aimed to gain a better understanding of the mechanisms of the W-Cl repair principle within the framework of fundamental investigations, to contribute to the creation of the necessary basis for a broader application of the repair principle in practice. The focus was on the development of a model to describe the chloride redistribution after the application of a system sealing surface protective coating. On the basis of Fick's second law of diffusion, a mathematical model with a self-contained analytical solution was developed, with the help of which the chloride redistribution after application of a system sealing surface protective coating can be calculated under the idealized assumption of complete water saturation of the concrete. Furthermore, the influence of the dehydration of the concrete, expected as a result of the application of the repair principle W-Cl, on the chloride redistribution was investigated. On the basis of laboratory tests and numerical simulations, material-specific reduction functions were developed to quantify the relationship between the chloride diffusion coefficient and the ambient humidity. K E Y W O R D Schloride, chloride redistribution, reinforced concrete, repair method

show abstract

“…B. [28]). Ein oftmals im Rahmen von Gutachten angegebener Grenzwert für Chloride wird in [29] genannt.…”

Section: Bauwerksuntersuchungenunclassified

Materialuntersuchungen an Hennigsdorfer Spannstahl aus Brückenbauwerken

Wilhelm¹,

Scheerer

Hampel

et al. 2015

Bautechnik

View full text Add to dashboard Cite

Zum Ansatz eines kritischen Chloridgehaltes bei Stahlbetonbauwerken

Cited by 23 publications

References 10 publications

Experimental Protocol to Determine the Chloride Threshold Value for Corrosion in Samples Taken from Reinforced Concrete Structures

Experimental Protocol to Determine the Chloride Threshold Value for Corrosion in Samples Taken from Reinforced Concrete Structures

Investigation on the effectiveness of the repair method 8.3 “Corrosion protection by increasing the electrical resistivity” in chloride‐containing concrete Part 2: Chloride redistribution in concrete after application of a system sealing surface protective coating

Materialuntersuchungen an Hennigsdorfer Spannstahl aus Brückenbauwerken

Contact Info

Product

Resources

About