Show simple item record

dc.contributor.authorHamilton, Andrea
dc.contributor.authorHall, Christopher
dc.contributor.authorPel, Leo
dc.date.accessioned2008-11-03T10:07:23Z
dc.date.available2008-11-03T10:07:23Z
dc.date.issued2008-10-15
dc.identifier.citationJ. Phys. D: Appl. Phys. 41 (2008) 212002en
dc.identifier.urihttp://dx.doi.org/10.1088/0022-3727/41/21/212002
dc.identifier.urihttp://stacks.iop.org/JPhysD/41/212002
dc.identifier.urihttp://hdl.handle.net/1842/2532
dc.description.abstractIt is well known that sodium sulfate causes salt crystallization damage in building materials and rocks. However since the early 1900s the existence of the metastable heptahydrate has been largely forgotten and almost entirely overlooked in scientific publications on salt damage mechanics and on terrestrial and planetary geochemistry. We use hard synchrotron x-rays to detect the formation of this metastable heptahydrate on cooling a porous calcium silicate material saturated with sodium sulfate solution. The heptahydrate persists indefinitely and transforms to mirabilite only below 0 ◦C. At the transformation, which is rapid, the solution is highly supersaturated with respect to mirabilite. We estimate that crystallization of the heptahydrate and of mirabilite have associated Correns pressures of about 9 and 19 MPa, respectively, exceeding the tensile strength of building stones. We detect lattice strains in the salts from x-ray measurements consistent with these values.en
dc.format.extent684819 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherIOP Publishingen
dc.subjectSodium sulfateen
dc.subjectCrystallizationen
dc.subjectSynchrotronen
dc.subjectCalcium silicateen
dc.titleSodium sulfate heptahydrate: direct observation of crystallization in a porous materialen
dc.typeArticleen


Files in this item

This item appears in the following Collection(s)

Show simple item record