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A Field Apparatus for Measuring Unconfined Compressive Strength
Author(s) -
Cook B. J.,
Nimlos T. J.
Publication year - 1998
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1998.03615995006200050012x
Subject(s) - compressive strength , calibration , measure (data warehouse) , field strength , computer science , geotechnical engineering , engineering , materials science , mathematics , statistics , composite material , physics , data mining , quantum mechanics , magnetic field
Laboratory techniques for measuring unconfined compressive strength are standardized by testing groups (e.g., American Association of State Highway and Transportation Officials), often requiring technologically complex and expensive equipment. However, much of this technology is not available in developing countries. We describe the construction, operation, calibration, and application of a modified hydraulic jack for determining unconfined compressive strength. Three calibration curves are presented to provide options for laboratories with varying technological capabilities. Application shows that variation in measurements comes from natural variation within materials rather than from the modified jack. Our modified jack is simple, inexpensive, and precise. Testing shows it to have a high correlation to standard laboratory techniques ( R 2 = 0.89) and establishes it as a reliable measure of unconfined compressive strength.