Critical Chloride Content
Critical Chloride Content - Related Videos
10:00
Experimental Protocol to Determine the Chloride Threshold Value for Corrosion in Samples Taken from Reinforced Concrete Structures
0 Views •
Cited by 38 •
2017
We propose a method to measure a parameter that is highly relevant for corrosion assessments or predictions of reinforced concrete structures, with the main advantage of permitting testing of samples from engineering structures. This ensures real conditions at the steel-concrete interface, which are crucial to avoid artifacts of laboratory-made samples.
07:32
Dynamic Electrochemical Measurement of Chloride Ions
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Cited by 5 •
2016
Dynamic measurement of chloride ions is presented. Transition time of an Ag/AgCl electrode, during a chronopotentiometric technique, can give the concentration of chloride ions in electrolyte. This method does not require a stable conventional reference electrode.
15:04
A Neuronal and Astrocyte Co-Culture Assay for High Content Analysis of Neurotoxicity
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Cited by 46 •
2009
This article describes a novel protocol and reagent set designed for sensitive measurement of neurotoxic effects of compounds and treatments on co-cultures of neurons and astrocytes using high content analysis. Results demonstrate that high content analysis represents an exciting novel technology for neurotoxicity assessment.
10:37
Ferric Chloride-induced Murine Thrombosis Models
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Cited by 56 •
2016
We report a refined procedure of the ferric chloride (FeCl3)-induced thrombosis models on carotid and mesenteric artery as well as vein, characterized efficiently using intravital microscopy to monitor time to occlusive thrombi formation.
07:42
Detecting the Water-soluble Chloride Distribution of Cement Paste in a High-precision Way
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Cited by 3 •
2017
A protocol for obtaining a water-soluble chloride profile by using a high precision milling method is presented.
FAQs
When the local chloride concentration at embedded steel exceeds the condition-dependent threshold, chloride ions can disrupt the passive oxide film that normally protects the reinforcement. This loss of passivity makes electrochemical corrosion possible, provided moisture and oxygen are available. The relevant concentration is therefore the amount reaching the steel surface, not simply the chloride level elsewhere in the concrete.
The threshold changes with cement composition, concrete alkalinity, the condition of the embedded steel, and environmental exposure. These variables affect how readily chlorides reach or destabilize the passive film. Consequently, engineers treat critical chloride content as a condition-dependent durability parameter rather than a single constant, which improves the reliability of corrosion assessments and service-life estimates.
Chloride-induced depassivation does not act independently of the surrounding environment. Moisture and oxygen support the electrochemical processes associated with corrosion after the protective oxide film has been disrupted. This means that reaching the chloride threshold identifies a critical corrosion condition, while environmental availability of moisture and oxygen influences whether corrosion can proceed and affect the reinforcement.
For existing structures, engineers use the parameter to judge whether chloride exposure has approached a condition capable of initiating reinforcement corrosion. The assessment supports interpretation of chloride ingress toward embedded steel and helps distinguish current durability concerns from longer-term risks. This information can guide decisions about further evaluation, protective measures, and maintenance priorities.
Designers use the threshold as a durability target when selecting concrete mixtures and protective systems for chloride-exposed structures. Because the critical value depends on cement composition, alkalinity, steel condition, and exposure, design decisions must account for the intended conditions rather than rely on an isolated threshold. The aim is to reduce the likelihood that chlorides reach a corrosion-initiating condition.
Critical chloride content provides a reference for estimating the time until chloride ingress creates conditions suitable for corrosion initiation. Engineers can use that estimate to support service-life prediction and schedule maintenance before deterioration becomes more advanced. Since the threshold varies among structures and environments, incorporating condition-specific factors produces more useful planning information than applying one fixed value universally.