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The deterioration of buildings and monuments by gypsum is the result of crystallization cycles of this salt. Although gypsum
can dehydrate to a hemihydrate, the mineral bassanite, and to an anhydrate, the mineral anhydrite, this reaction occurs in
nature on a geological time scale and therefore it is unlikely to occur when gypsum is found on and in building materials.
The CaSO4–H2O system appears deceptively simple, however there are still discrepancies between the experimental and thermodynamically
calculated data. The reason for the latter can be attributed to the slow crystallization kinetics of anhydrite. Apart from
this, the large numbers of studies carried out on this system have focused on industrially important metastable phases, such
as the hemihydrate and soluble anhydrite. The paper presents a review of the studies dealing with the phase equilibria of
the CaSO4–H2O system as well as the influence of other salts on the solubility of gypsum. It tries to glean out the relevant information
that will serve to explain the deterioration observed on building materials by the crystallization of gypsum and thus allows
developing improved conservation methods. 相似文献
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Joshi Aditya U. Sant Dhananjay A. Parvez Imtiyaz A. Rangarajan Govindan Limaye Manoj A. Mukherjee Soumyajit Charola Mitesh J. Bhatt Meghnath N. Mistry Sagar P. 《International Journal of Earth Sciences》2018,107(1):191-201
International Journal of Earth Sciences - We report, using the microtremor method, a subsurface granitic pluton underneath the Narukot Dome and in its western extension along a WNW profile, in... 相似文献
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