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Phosphate Ions: Does Exposure Lead to Degradation of Cementitious Materials?

[+] Author Affiliations
Dan J. Naus, Catherine H. Mattus, Leslie R. Dole

Oak Ridge National Laboratory, Oak Ridge, TN

Herman L. Graves, III

U.S. Nuclear Regulatory Commission, Washington, DC

Paper No. ICONE16-48051, pp. 415-421; 7 pages
doi:10.1115/ICONE16-48051
From:
  • 16th International Conference on Nuclear Engineering
  • Volume 1: Plant Operations, Maintenance, Installations and Life Cycle; Component Reliability and Materials Issues; Advanced Applications of Nuclear Technology; Codes, Standards, Licensing and Regulatory Issues
  • Orlando, Florida, USA, May 11–15, 2008
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-4814-0 | eISBN: 0-7918-3820-X

abstract

An assessment of the potential effects of phosphate ions on cementitious materials was made through a review of the literature, contacts with concrete research personnel, and conduct of a “bench-scale” laboratory investigation [1]. The objectives of this limited study were to: (1) review the potential for degradation of cementitious materials due to exposure to high concentrations of phosphate ions; (2) provide an improved understanding of any significant factors that may lead to a requirement to establish exposure limits for concrete structures exposed to soils or ground waters containing high levels of phosphate ions; (3) recommend, as appropriate, whether a limitation on phosphate ion concentration in soils or ground water is required to avoid degradation of concrete structures; and (4) provide a “primer” on factors that can affect the durability of concrete materials and structures in nuclear power plants. Results of a literature review, contacts with industry personnel, and a laboratory investigation indicate that no harmful interactions occur between phosphate ions and cementitious materials unless phosphates are present in form of phosphoric acid. Relative to the “primer,” NUREG/CR-6927, published in February 2007, provides a review of pertinent factors that can affect the durability of nuclear power plant reinforced concrete structures.

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