GSO ASTM D4718/D4718M:2022
Gulf Standard
Current Edition
·
Approved on
12 May 2022
·
Standard Practice for Correction of Unit Weight and Water Content for Soils Containing Oversize Particles
GSO ASTM D4718/D4718M:2022 Files
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GSO ASTM D4718/D4718M:2022 Scope
1.1 This practice presents a procedure for calculating the
unit weights and water contents of soils containing oversize
particles when the data are known for the soil fraction with the
oversize particles removed.
1.2 This practice also can be used to calculate the unit
weights and water contents of soil fractions when the data are
known for the total soil sample containing oversize particles.
1.3 This practice is based on tests performed on soils and
soil-rock mixtures in which the portion considered oversize is
that fraction of the material retained on the 4.75-mm [No. 4]
sieve. Based on these tests, this practice is applicable to soils
and soil-rock mixtures in which up to 40 % of the material is
retained on the 4.75-mm [No. 4] sieve. The practice also is
considered valid when the oversize fraction is that portion
retained on some other sieve, but the limiting percentage of
oversize particles for which the correction is valid may be
lower. However, the practice is considered valid for materials
having up to 30 % oversize particles when the oversize fraction
is that portion retained on the 19-mm [3⁄4-in.] sieve.
1.4 The factor controlling the maximum permissible percentage of oversize particles is whether interference between
the oversize particles affects the unit weight of the finer
fraction. For some gradations, this interference may begin to
occur at lower percentages of oversize particles, so the limiting
percentage must be lower for these materials to avoid inaccuracies in the computed correction. The person or agency using
this practice shall determine whether a lower percentage is to
be used.
1.5 This practice may be applied to soils with any percentage of oversize particles subject to the limitations given in 1.3
and 1.4. However, the correction may not be of practical
significance for soils with only small percentages of oversize
particles. The person or agency specifying this practice shall
specify a minimum percentage of oversize particles below
which the practice need not be applied. If a minimum percentage is not specified, 5 % shall be used.
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