Determining Moisture-Unit Weight Relations of Soil (Compaction Test) - Soil Properties: Testing, Measurement, and Evaluation - page 167

(2.5) Use —Shall be used if more than 20% by mass of the material
is retained on the No. 4 (4.75-mm) sieve and 20% or less by mass of
the material is retained on the 3 ⁄ 8 -in. (9.5-mm) sieve.

(2.6) Other Use —If this method is not specified, materials that
meet these gradation requirements may be tested using Method C.

(3) Method C:

(3.1) Mold —6-in. (152.4-mm) diameter.

(3.2) Material —Passing 3 ⁄ 4 -in. (19.0-mm) sieve.

(3.3) Layers —Three.

(3.4) Blows per layer —56.

(3.5) Use —Shall be used if more than 20% by mass of the material
is retained on the 3 ⁄ 8 -in. (9.5-mm) sieve and less than 30% by mass
of the material is retained on the 3 ⁄ 4 -in. (19.0-mm) sieve.

(4) The 6-in. (152.4-mm) diameter mold shall not be used with
Method A or B.

Note 1 —Results have been found to vary slightly when a ma-
terial is tested at the same compactive effort in different size
molds.

This test method applies only to soils that have 30% or less by
mass of particles retained on the the 3 ⁄ 4 -inch (19.0-mm) sieve.

Note 2 —For relationships between unit weights and water
contents of soils with 30% or less by weight of material re-
tained on the 3 ⁄ 4 -in. (19.0-mm) sieve to unit weights and water
contents of the fraction passing 3 ⁄ 4 -in. (19.0-mm) sieve, see
ASTM Practice D 4718.

If the specimen contains more than 5% by weight oversize fraction
(coarse fraction) and the material will not be included in the test, cor-
rections must be made to the unit weight and water content of the spec-
imen or to the appropriate field in-place density test specimen using
ASTM Practice D 4718.

Compaction test equipment (see Figures 12-1 through 12-5)
Mold, 4 in.—A mold having a 4.000 ± 0.016-in. (101.6 ± 0.4-mm)
average inside diameter, a height of 4.584 ± 0.018-in. (116.4 ±
0.5-mm) and a volume of 0.0333 ± 0.0005 ft 3 (944 ± 14 cm 3 ).
A mold assembly having the minimum required features is
shown in Figure 12-1.
Mold, 6 in.—A mold having a 6.000 ± 0.026-in. (152.4 ± 0.7- mm)
average inside diameter, a height of 4.584 ± 0.018-in. (116.4 ±
0.5-mm), and a volume of 0.075 ± 0.0009 ft 3 (2124 ± 25 cm 3 ).
A mold assembly having the minimum required features is
shown in Figure 12-2.

APPARATUS
AND SUPPLIES