Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 37, Issue -, Pages 46-50Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2012.07.031
Keywords
Sodium monofluorophosphate; Portlandite; Dissolution-precipitation process; Kinetics; Corrosion inhibitor; Cement paste
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Funding
- Spanish Research Council (CSIC)
- European Social Fund
- CICYT, Spain [BIA2008-05398]
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The chemical products generated in the reaction between sodium monofluorophosphate and cement paste, simulated by a calcium hydroxide solution, were analysed using X-ray diffraction and transmission electron microscopy with energy dispersive X-ray analysis. Portlandite, apatite, fluorite, calcite and amorphous products were identified as the main synthesized phases. Nanoparticles of hydroxyfluoroapatite (Ca-5(PO4)(3)(OH,F)) were also profiled. In a medium of high alkalinity such as the tested experimental conditions, PO3F2- is decomposed into PO43- and F- ions, placing its utility as a corrosion inhibitor for steel reinforcements in doubt. (C) 2012 Elsevier Ltd. All rights reserved.
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