Fall cone test
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The Fall cone test, also called the cone penetrometer test is an alternate to the Casagrande method for measuring the Liquid Limit of a soil sample. It is often preferred to the Casagrande method because it is more repeatable and less variable with different operators. In the test, a soil sample is placed in a 55 mm diameter, 40 mm deep metal cup. A stainless steel cone weighing 80 g (including the shaft) and having a 30° angle is positioned so that its tip just touches the sample. The cone is released for 5 seconds so that it may penetrate the soil. The liquid limit is defined as the water content of the soil which allows the cone to penetrate exactly 20 mm during that period of time. Because it is difficult to obtain a test with exactly 20 mm penetration, the procedure is performed multiple times with a range of water contents and the results are interpolated.
- Houlsby, G. T. (1 June 1982). "Theoretical analysis of the fall cone test." (pdf). Géotechnique. pp. 111–118. doi:10.1680/geot.19188.8.131.52. ISSN 0016-8505.
- Powrie, W., Spon Press, 2004, Soil Mechanics - 2nd ed ISBN 0-415-31156-X
- BS 1377-2:1990, Methods of test for soils for civil engineering purposes. Classification tests. Civil engineering > Earthworks. Excavations. Foundation construction. Underground works. British Standards Institution. 1990.