Journal
CANADIAN GEOTECHNICAL JOURNAL
Volume 49, Issue 9, Pages 1015-1023Publisher
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/T2012-066
Keywords
Atterberg limits; liquid limit; dynamic analysis; clay; Newmarkian analysis
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The liquid limit of soils can be measured using either the cup apparatus developed by Casagrande or by the fall-cone method, which is now the standard in much of Europe. This paper will demonstrate, based on a Newmarkian sliding block analysis of the Casagrande percussion test, that these two methods measure different mechanical properties of the soil; the cup test being a measure of specific strength, i.e., strength divided by density, whereas the fall cone is a direct measure of strength. Sources of error in the operation of the percussion test are quantified and a modification to the fall-cone test is proposed to standardize results between the two test methods.
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