IS 2720 (PART-VII) ASTM D-42, BS 1377 AASHTO T 90
Moisture contents at which soil has smallest plasticity is called limit. For
determination purpose plastic limit is defined as the water content at
which a soil will just begin to crumble when rolled in to a thread of 3mm dia. Specification
The complete set consists of one each :
IS 2720 (PART-VII) ASTM D 427, BS 1377,
AASHTO T 92.
Shrinkage limit is the maximum water content at which a
reduction in water content does not cause an
appreciable reduction in volume of the Soil Mass. At
shrinkage limit, on further reduction in water, air enters in to
the voids of soils and thus keeps the volume constant.
The apparatus can be used to determine shrinkage limit and to
calculate other shrinkage ratio, shrinkage index and
volumetric shrinkage.
BS 1377-2 Specification:
A simple mould which is filled with the soil under test. This is
then dried and the resulting decrease os length of the
specimen measured is expressed as the linear
shrinkage. It is 25mm Dia. x 12.5mm Height x 140mm Length.