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- W115315162 abstract "This chapter highlights the usage of gypsum, which has long been recognized as an important and essential component of Portland cement. Gypsum was first used with Portland cement to retard the rate of setting sufficiently to permit the proper placing of mortar and concrete. It is not possible to determine when and by whom this property of gypsum was discovered, but it appears likely that it was discovered accidentally by workmen mixing cement mortar in uncleaned equipment that had been used for mixing Plaster of Paris. It has been recognized that gypsum and calcium sulfates in general play an important role in the manufacture of clinker-mineralizer or modifier in the recycling of alkalis—both as binding components-expansive cements—and as regulators of the rheology and of the hydration rate of Portland cement. Gypsum conditions, even the long-term characteristics of concrete stone, characteristics which, being determined by a complexity of phenomena which develop with time, are notably affected by the structures which develop in the initial stage, when the cement compounds react with calcium sulfate. Part of the sulfate necessary for the initial reactions is found already in the clinker as alkali sulfate, which rapidly passes into solution. Part derives from the calcium sulfate added during grinding, but its behavior upon dissolution depends on the form in which it is contained in the cement." @default.
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- W115315162 date "1983-01-01" @default.
- W115315162 modified "2023-09-25" @default.
- W115315162 title "Gypsum in Cement" @default.
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- W115315162 doi "https://doi.org/10.1016/b978-0-08-028670-9.50020-x" @default.
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