Corrosion inhibitive admixtures for concrete (A review of the current state of the art)
- Henkel Corp., Ambler, PA (United States). Corporate Research and Development
Corrosion inhibitive admixtures, chemicals added to the concrete mixture to decrease the corrosion activity of the steel reinforcement, are an easy, cost-effective method for corrosion protection. This paper will review some of the issues related to the corrosion process and to the use of corrosion inhibitive admixtures to extend the service life of steel reinforced structures. The principle cause of corrosion damage to steel reinforced concrete, even high quality concrete, is chloride ion attack. To perform properly an inhibitive admixture must provide protection against chloride induced corrosion. Corrosion inhibitive admixtures provide protection by two mechanisms: (1) a chloride screening mechanism which prolongs the time it takes for chloride to reach the surface of the metal, and (2) an interfacial process where protection is provided by decreasing the corrosion activity at the reinforcing steel surface. The classes of admixtures which prolong the time it takes for chlorides to reach the surface of the reinforcing bars are: hydrophobic materials, pozzolanic materials (e.g. silica fume, fly ash, etc.), and superplasticizers. Interfacial corrosion inhibitive admixtures provide protection by decreasing the corrosion activity by a thermodynamic or a kinetic process or both. The science and technology of corrosion inhibitive admixtures is a developing area, and as such, universally accepted testing procedures have not been established. For the more recently developed admixtures, long duration field exposure test data are not yet available.
- OSTI ID:
- 397831
- Report Number(s):
- CONF-960389--
- Country of Publication:
- United States
- Language:
- English
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