Liquid Limit on Organic Soils

[learning2geotech]

Liquid limit tests are required to be performed before and after oven-dried for organic soils; however, ASTM 4318 (Atterberg Limits) does not specify the temperature to dry the soils for the after-oven-dried liquid limit test on organic soils? Is it the typical 110±5 Celsius (to burn off water content in accordance with ASTM 2216)? or 440 Celsius (to burn off the organics in accordance with ASTM 2974)?

 

[GeoEnvGuy]

ASTM D2974 method c and d, 440 and 750 Celsius are for determining ash content and not moisture. Method A 110 Celsius is for soils ID. Method B is room drying then 110 Celsius if using peat for fuel.