Procesures for Evaluating Corrosion - Inhibiting Admixtures for Structural Concrete





SUMMARY

PROCEDURES FOR EVALUATING CORROSION-INHIBITING

ADMIXTURES FOR STRUCTURAL CONCRETE

During the past fifteen years, corrosion-inhibiting admixtures (CIAs) have become

increasingly popular for long-term protection of reinforced and prestressed concrete

components of highway bridges and other structures. However, there remains

considerable debate about the benefits of CIAs in concrete. The objectives of this

research were to (1) develop procedures for evaluating and qualifying corrosioninhibiting

admixtures and (2) recommend performance criteria for their acceptance.



Phase I work included a literature review of CIAs, the review of test procedures

presently used for evaluating CIAs, and the development of a laboratory test plan for

evaluating CIAs. In Phase II, the laboratory test plan was executed and performance

criteria for qualifying an admixture as a CIA were developed.


The following corrosion inhibiting admixtures (CIAs), which are available

commercially, were identified. Based on proposed mechanism of protection, they were

combined into four groups.


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