particles and 13 mm (
in.) in diameter for 2.00-mm (No. 10)
maximum size particles. The length of the spout should be
greater than the full length of the permeability chamber—at
least 150 mm (6 in.).
4.4 Specimen Compaction Equipment 2
equipment as deemed desirable may be used. The following are
suggested: a vibrating tamper fitted with a tamping foot 51 mm
(2 in.) in diameter; a sliding tamper with a tamping foot 51 mm
(2 in.) in diameter, and a rod for sliding weights of 100 g (0.25
lb) (for sands) to 1 kg (2.25 lb) (for soils with a large gravel
content), having an adjustable height of drop to 102 mm (4 in.)
for sands and 203 mm (8 in.) for soils with large gravel
4.5 Vacuum Pump or Water-Faucet Aspirator, for evacuat-
ing and for saturating soil specimens under full vacuum (see
4.6 Manometer Tubes, with metric scales for measuring
head of water.
4.7 Balance, of 2-kg (4.4-lb) capacity, sensitive to 1 g
4.8 Scoop, with a capacity of about 100 g (0.25 lb) of soil.
4.9 Miscellaneous Apparatus—Thermometers, clock with
sweep second hand, 250-mL graduate, quart jar, mixing pan,
5. Sample 5.1 A representative sample of air-dried granular soil, con-
taining less than 10 % of the material passing the 75-µm (No.
200) sieve and equal to an amount sufficient to satisfy the
requirements prescribed in
, shall be selected by the
method of quartering.
5.2 A sieve analysis (see Method
) shall be made on a
representative sample of the complete soil prior to the perme-
ability test. Any particles larger than 19 mm (
in.) shall be
separated out by sieving (Method
). This oversize mate-
rial shall not be used for the permeability test, but the
percentage of the oversize material shall be recorded.
2—In order to establish representative values of coefficients of
permeabilities for the range that may exist in the situation being
investigated, samples of the finer, average, and coarser soils should be
obtained for testing.