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MECHANICAL METHOD FOR THE MEASUREMENT OF THE PLASTICITY OF CLAYS AND MIXTURES OF CLAYS *
Author(s) -
Whittemore J. W.
Publication year - 1935
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.1151-2916.1935.tb19414.x
Subject(s) - plasticity , grinding , penetration (warfare) , clay minerals , mineralogy , geology , materials science , geotechnical engineering , composite material , mathematics , operations research
A method of measuring the plasticity of clays and mixtures of clays is presented. An apparatus is described by which the penetration of a constantly loaded hemisphere into a plastic clay mass during a definite time period is measured. The data indicate that the formula, d = at P , expresses the relationship between t , the amount of penetration, during t, the time periods studied for any clay. Undoubtedly α is related to the load used, the diameter of the hemisphere, and some of the properties of the clay; P , in the formula, is a measure of the plastic properties of the clay. The data also show, through the variations in the value of P , the marked change in plasticity of a clay caused by changes in grinding, aging, and de‐airing of a clay.