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Materials Science: Set-Retarders and -Accelerators (3)

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Hydration retarder
A method of reclaiming unset cement compositions by mixing a polymethoxy polyphosphonate to the unset composition to cause long-term retardation of cement hydration and subsequently treating the composition with a set accelerator to reinitiate hydration.
Publisher: Luthra et al, 1993, US5215585
Cat: Patents: Cement Set Retarders

Effect of phosphonate additive on crystallization of gypsum in phosphoric and sulfuric acid medium
Study on the effect of aminotris (methylenephosphonic acid) on calcium sulfate dihydrate crystallization under conditions similar to those found in wet-process of phosphoric acid production (phospho-gypsum). [10 pages, 153 kB, PDF]
Publisher: H. El-Shall, M.M. Rashad, E.A. Abdel-Aal, Cryst. Res. Technol. 37 (12): 1264-1273. (2002)
Cat: Materials Science: Gypsum and Anhydrite

Wet gypsum accelerator
A wet gypsum accelerator comprising particles of calcium sulfate dihydrate, water, and (a) an organic phosphonic compound or (b) a phosphate-containing compound (or a mixture of them).
Publisher: United States Gypsum Company, 2002. US6409825
Cat: Patents: Gypsum Set Accelerators

705 Links in 142 Categories. [2013-05-21]