only the sand cone method as described in ASTM D 1556. ASTM D 2922results
in a wet unit weight of soil and when using this method ASTM D 3017 shall
be used to determine the moisture content of the soil. The calibration
curves furnished with the moisture gauges shall also be checked along with
density calibration checks as described in ASTM D 3017; the calibration
checks of both the density and moisture gauges shall be made at the
beginning of a job on each different type of material encountered and at
intervals as directed by the Contracting Officer.] [ASTM D 2937, Drive
Cylinder Method shall be used only for soft, fine-grained, cohesive soils.]
When test results indicate, as determined by the Contracting Officer, that
compaction is not as specified, the material shall be removed, replaced and
recompacted to meet specification requirements. Tests on recompacted areas
shall be performed to determine conformance with specification
requirements. Inspections and test results shall be certified by a
registered professional civil engineer. These certifications shall state
that the tests and observations were performed by or under the direct
supervision of the engineer and that the results are representative of the
materials or conditions being certified by the tests. The following number
of tests, if performed at the appropriate time, will be the minimum
acceptable for each type operation.
3.18.1
Fill and Backfill Material Gradation
One test per [_____] cubic meters yards stockpiled or in-place source
material. Gradation of fill and backfill material shall be determined in
accordance with [ASTM C 136] [ASTM D 422] [ASTM D 1140].
3.18.2
In-Place Densities
**************************************************************************
NOTE: Density test frequency can vary from one test
per 10 square meter (100 square feet) for small
areas up to one test per 900 square meter (10,000
square feet). The following table will also help
establish test frequency for various situations:
Location of
Material Type
Material
Test Frequency
Undisturbed
Structures
Two random tests in
native soil
building footings and
two tests on subgrade
within building line.
Fills and
Structures
One test per structure
backfills
(adjacent to)
per 200 sq. m taken 300
mm below finished grade.
Subgrades
Site (except
One test per lift per 250
airfields)
sq. m
Embankments
Any
One test per lift per 400
or borrow
cubic m placed.
Native soil
Any
One test or one test per
subgrade
900 sq. m whichever is
other than
greater.
structures
and parking
SECTION 02300
Page 44
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