Andrea Hamilton et al 2008 J. Phys. D: Appl. Phys. 41 212002 doi:10.1088/0022-3727/41/21/212002
Andrea Hamilton1,3, Christopher Hall1 and Leo Pel2
Show affiliationsIt 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.
Issue 21 (7 November 2008)
Received 16 June 2008, in final form 22 August 2008
Published 15 October 2008
Andrea Hamilton et al 2008 J. Phys. D: Appl. Phys. 41 212002
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