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THE “WHY” OF AGEING CLAY 1
Author(s) -
Spurrier H.
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.tb18119.x
Subject(s) - plasticity , algae , aqueous solution , ageing , chemistry , materials science , mineralogy , chemical engineering , botany , composite material , biology , organic chemistry , genetics , engineering
Ageing of clay.—(1) Evolution of CO 2 was found to continue for over 34 days after pugging and, like the change of plasticity, to proceed more rapidly between 80° and 90° F than below 60°. (2) Effect of replacing water by non‐aqueous liquids was to inhibit the development of plasticity altogether. (3) Effect of a dilute solution of H 2 O 2 was to produce a pronounced increase of viscosity and also to stimulate the growth of filaments algae and the consequent evolution of both CO and CO 2 . It seems probable, therefore, that the change of plasticity of clays with time is due, in some way, to the growth of such algae. (4) This algae theory would explain all the effects found. New chemical measure of the plasticity of clays.—The ratio of the amounts of Al 2 O 3 and SiO 2 dissolved by caustic potash was found, for the three clays tested (Cooley Ball, Edgar Plastic Kaolin and Harris Spruce Pine), to decrease rapidly with diminishing plasticity and therefore might well be used as a quantitative measure of plasticity.