The Liquid Limit of a soil is that water content, as determined in accordance with the following
procedure, at which the soil passes from a plastic to a liquid state.
AASHTO T 89-2002 history
1970AASHTO T 89-2017 Standard Method of Test for Determining the Liquid Limit of Soils
2013AASHTO T 89-2013 Standard Method of Test for Determining the Liquid Limit of Soils
2002AASHTO T 89-2002 Standard Method of Test for Determining the Liquid Limit of Soils