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A study of the action of borax in retarding the setting of plaster of Paris

✍ Scribed by Buchanan, A. S. ;Worner, K.

Publisher
Wiley (John Wiley & Sons)
Year
1946
Weight
345 KB
Volume
65
Category
Article
ISSN
0368-4075

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✦ Synopsis

Abstract

It is a matter of common knowledge that borax (Na~2~B~4~O~7~) is a very efficient agent for retarding the set of plaster of Paris. Its effect on the setting time is shown by the typical curve given in Fig. 1 (after Gibson and John‐on^1^). One of the explanations offered^2^ for this retardation phenomenon is that borax is physically adsorbed on the surface of the crystal, thus reducing the rates of solution of the hemihydrate and the formation of gypsum nuclei. Thin short investigation was initialed to test and the validity of this postulation.

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✍ JΓΆrg-RΓΌdiger Hill; Johann Plank πŸ“‚ Article πŸ“… 2004 πŸ› John Wiley and Sons 🌐 English βš– 231 KB

## Abstract To develop an understanding of the action of specific formulations, the growth of gypsum crystals under the influence of retardation agents (tartaric and citric acid) has been studied using molecular modeling. Surface energies of gypsum and plaster crystal faces were calculated using es