control.
b.
Under unpaved or turfed traffic areas, density shall not be less
than 90 percent of maximum density for cohesive material and 95
percent of maximum density for cohesionless material.
c.
Under nontraffic areas, density shall be not less than that of the
surrounding material.
3.7.5
Determination of Density
Testing shall be the responsibility of the Contractor and performed at no
additional cost to the Government. Testing shall be performed by an
approved commercial testing laboratory or by the Contractor subject to
approval. Tests shall be performed in sufficient number to ensure that
specified density is being obtained. Laboratory tests for moisture-density
relations shall be made in accordance with ASTM D 1557 except that
mechanical tampers may be used provided the results are correlated with
those obtained with the specified hand tamper. Field density tests shall
be determined in accordance with ASTM D 2167 or ASTM D 2922. When ASTM D
2922 is used, the calibration curves shall be checked and adjusted, if
necessary, using the sand cone method as described in paragraph Calibration
of the referenced publications. ASTM D 2922 results 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 be checked along with density calibration checks
as described in ASTM D 3017 or ASTM D 2922. Test results shall be
furnished the Contracting Officer. 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.
3.8
PIPELINE TESTING
3.8.1
Leakage Tests
**************************************************************************
NOTE: When the quantity of pipe required for a
project is so small that the provisions for testing
and certification of watertightness of joints
appears to be economically unfeasible, such
provisions should be deleted.
Select appropriate leakage rate.
Delete paragraph when watertight joints are not
required.
**************************************************************************
Lines shall be tested for leakage by low pressure air or water testing or
exfiltration tests, as appropriate. Low pressure air testing for vitrified
clay pipes shall conform to ASTM C 828. Low pressure air testing for
concrete pipes shall conform to ASTM C 924M ASTM C 924. Low pressure air
testing for plastic pipe shall conform to ASTM F 1417. Low pressure air
testing procedures for other pipe materials shall use the pressures and
testing times prescribed in ASTM C 828 or ASTM C 924M ASTM C 924, after
consultation with the pipe manufacturer. Testing of individual joints for
leakage by low pressure air or water shall conform to ASTM C 1103M ASTM C
1103. Prior to exfiltration tests, the trench shall be backfilled up to at
least the lower half of the pipe. If required, sufficient additional
SECTION 02630
Page 39
Previous Page
