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A STUDY OF THE EFFECT OF GROG ON PRESSURE TRANSMISSION IN DRY PRESSING 1
Author(s) -
Dodd By C. M.,
Holmes M. E.
Publication year - 1931
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.1151-2916.1931.tb16591.x
Subject(s) - grog , brick , porosity , pressing , materials science , geotechnical engineering , composite material , transmission (telecommunications) , geology , mineralogy , metallurgy , engineering , electrical engineering
A study of the dry‐pressing characteristics of several fire brick and building brick clays was made by compressing them, at high and low pressures, into large shapes with a hydraulic press The clays do not effectively transmit the pressure into the interior. The finest grained clays are morc deficient in this respect. The result is a porosity gradient as high as 15% of the interior porosity between center and surface. Such a variation may account, in part, for the defects in dry‐press ware. The addition of fired grog increases the pressure transmission. Some clays require more than 50% grog and some less for maximum pressure transmission and optimum results. Fireclay shapes as much as ten inches in thickness and of substantially uniform physical properties can be formed if the proper amount of grog is used.