ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 40, (2) 72 - 76 (1996)


STRENGTH AND MICROSTRUCTURE OF CAST GYPSUM
 
Šatava Vladimír
 
Laboratory of Inorganic Materials of the Institute of Inorganic Chemistry AS CR and the Institute of Chemical Tehnology, Technická 5, 166 28 Prague

On the basis of experimentally established data on the size and shape of gypsum crystals which constitute the solid phase in hardened suspensions of CaSO₄ . 0.5 H₂O, and on that of the size of pores in the materials it was shown that the strength of hardened gypsum was proportional to the area of mutual contacts between the gypsum crystals. Mechanical failure occurs at these contacts which represent the points with weakest bonds. Analyses of the microstructure of fracture surfaces resulted in the same conclusions.


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