Volume 43, N. 4

October-December 2020

Determination of liquid limit by the Fall Cone Method

Technical Notes

Volume 43, N. 4, October-December 2020 | PDF (38 downloads)

Abstract

The knowledge of soil characterization parameters allows identification and classification of materials. Also, indicates the soil behavior in front of stress and deformation. The aim of this paper was to evaluate the methods available for determining the liquid limit by the Casagrande device and Fall Cone equipment. The classic method of Casagrande was developed by Arthur Casagrande in 1932 and the Swedish Fall Cone was developed by Geotechnical Commission of the Swedish State Railways in 1915. To guarantee the representativeness of the evaluation, 31 Brazilian soil samples from different origins were tested (marine, residual, colluvium and tailings). In order to understand the behavior of the samples and evaluate the applicability of the Swedish Fall Cone method were determined other geotechnical properties as a percentage of fines, specific gravity and plastic limit. The results show that the values obtained with the Casagrande method are slightly lower than with the Fall Cone equipment. It was observed a coherent correlation between the methods for liquid limits values less than 80 % with a corresponding coefficient of determination R2 of 0.9453. Above this moisture content, it was not possible to verify any correlations between the methods applied.

Keywords: Atterberg limits, Casagrande, Consistency, Fall Cone,


Submitted on January 19, 2020.
Final Acceptance on June 27, 2020.
Discussion open until March 31, 2021.
DOI: 10.28927/SR.434661