Study of compatibility of methods for liquid limit measurement according to Czech state standard and newly adopted European standard

Abstract

The goal of the publication is a correlation between the methodology of liquid limit determination using Casagrande bowls according to the Czech state standard being valid as yet and the methodology on a principle of the conical test according to a newly adopted European standard. It allows a better link of utilization of an extensive statistical set of investigations realized for purposes of foundation engineering in past that are available in Geofond for newly conducted engineering geological studies according to the new European standard related to water contents at the liquid limit for wide-spread clay soils. The sample values ranged from 21.49 to 49.56 % according to Casagrande and in the conical test they ranged from 24.11 to 51.07 %. The difference of the results for identical samples reached values from 1.15 to 4.19 %. The studied mean difference coefficient between methods amounts to 2.55 %.