GSO ASTM D4318:2022
Gulf Standard
Current Edition
·
Approved on
12 May 2022
·
Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils
GSO ASTM D4318:2022 Files
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GSO ASTM D4318:2022 Scope
1.1 These test methods cover the determination of the liquid
limit, plastic limit, and the plasticity index of soils as defined
in Section 3 on Terminology.
1.2 Two procedures for preparing test specimens are provided as follows: Specimen Preparation Procedure 1 (Wet
Preparation), as described in 11.1 and Specimen Preparation
Procedure 2 (Dry Preparation), as described in 11.2. The
specimen preparation procedure to be used shall be specified
by the requesting authority. If no specimen preparation procedure is specified, use the wet preparation procedure. (See
Section 6, Interferences.)
1.3 Two methods for determining the liquid limit are provided as follows: Liquid Limit Method A (Multipoint Method),
as described in Sections 12 and 13, and Liquid Limit Method B
(One-Point Method), as described in Sections 14 and 15. The
method to be used shall be specified by the requesting
authority. If no method is specified, use Method A. (See
Section 6, Interferences.)
1.4 The plastic limit test, Method for Plastic Limit, is
performed on material prepared for the liquid limit test. When
determining the plastic limit, two procedures for rolling portions of the test specimen are provided as follows: Plastic Limit
Rolling Procedure 1 (Hand Rolling), and Plastic Limit Rolling
Procedure 2 (Using the Rolling Device).
1.5 The liquid limit and plastic limit of soils (along with the
shrinkage limit) are often collectively referred to as the
Atterberg limits. These limits distinguished the boundaries of
the several consistency states of plastic soils.
1.6 The plasticity index, Method for Plasticity Index, is
calculated using results from liquid limit and plastic limit
testing.
1.7 The methods described herein are performed only on
that portion of a soil that passes the 425-µm (No. 40) sieve.
Therefore, the relative contribution of this portion of the soil to
the properties of the sample as a whole must be considered
when using these methods to evaluate the properties of a soil.
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