Reliability of chloride testing results in cementitious systems containing admixed chlorides

Ahmed, Ahmed A.; Vaddey, Naga Pavan

doi:10.1080/23789689.2021.1917059

Cited by 4 publications

(1 citation statement)

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“…This binding of chlorides in the acid-soluble testing can result in an underestimation of total chlorides. In the same context, Ahmed and Vaddey (2021) reported that the concentration of acid-soluble chlorides in fully carbonated OPC, CAC, and CSA paste samples is lower than the concentration of acid-soluble chlorides in uncarbonated paste samples; this indicates some binding of acid-soluble chlorides after carbonation.…”

Section: Summary Conclusion and Recommendationsmentioning

confidence: 96%

Quantifying Conservativeness of Water-Soluble Chloride Testing

2023

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Proponents of water-soluble chloride testing argue that only chlorides in the pore solution contribute to corrosion and that this testing is more representative of free chlorides and therefore should be required. Proponents of acid-soluble chloride testing argue that although water-soluble testing may be more representative of free chlorides in the pore solution at early ages, bound chlorides can become unbound with time, making the water-soluble test unconservative for predicting later-age free chlorides. However, watersoluble testing likely unbinds some admixed chlorides during testing. If the number of chlorides released as part of the watersoluble test exceeds the number of chlorides released at later ages (that is, from carbonation), the water-soluble test should be sufficiently conservative. This research quantifies the release of admixed chlorides as a result of testing and carbonation. Results indicate that water-soluble testing is sufficiently conservative in most cases for assessing admixed chloride contents in various cementitious systems.

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Section: Summary Conclusion and Recommendationsmentioning

confidence: 96%