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THE RELATION BETWEEN THE FINENESS AND OTHER PROPERTIES OF CALCINED GYPSUM 1
Author(s) -
Emley W. E.,
Welch F C.
Publication year - 1921
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1921.tb17349.x
Subject(s) - fineness , gypsum , calcination , vicat softening point , materials science , porosity , mineralogy , consistency (knowledge bases) , mathematics , composite material , chemistry , geometry , biochemistry , softening point , catalysis
Experimental methods.—The normal consistency was measured by the Southard viscosimeter. the time of set by the Vicat needle, and the plasticity by spreading upon a porous porcelain plate. Conclusions.—(1) Normal consistency is obtained with less water the coarser the calcined gypsum, (2) the finer the material the shorter the time of set, (3) the finer the calcined gypsum the stronger is the set material until the degree of fineness beyond that of size 6 (A. S. T. M. spec.) after which increase in fineness is accompanied by decrease in strength, (4) the finer the calcined gypsum the more sand it will carry.