partly on fill and partly on natural ground. For
crib retaining wall, not more than 10 percent by
weight of the fill material should be finer than 75
micrometers (No. 200) sieve. Also, specify
coefficient of permeability within the range of 0.01
to 1.0 mm per second (0.002 to 0.20 feet per minute)
and soil classification GW, GP, SW and SP. Indicate
with cross sections or section details on the
contract drawings the limits or extents of any
controlled fills or backfills. Specify class of
material that is acceptable in the fill or backfill
giving preference to any types available at or near
the site. Select appropriate values for Atterberg
limits and percentage of fines and specify maximum
thickness of lifts for compaction.
For piping bedding the maximum size of aggregate
should be not more than 8 mm per 100 mm (1 inch per
foot) of pipe diameter, or 75 mm (3 inches) maximum.
Refer to pipe manufacturer's criteria for more
stringent requirements, if any, on aggregate size
and gradation.
If suitable materials for this project are limited
to materials classified as GW, GP, SW, or SP, delete
the bracketed sentences of this paragraph.
Coordinate requirements with a geotechnical
engineer. Select fill used for structures should
extend a minimum of 1.5 m (5 feet) outside the
building foundation lines or other building elements
gaining support from the fill.
**************************************************************************
1.4.10.1
General Requirements
Select granular material shall consist of materials classified as [GW,]
[GP,] [SW,] [SP,] or [_____] by ASTM D 2487 where indicated. [The liquid
limit of such material shall not exceed [35] [_____] percent when tested in
accordance with ASTM D 4318. The plasticity index shall not be greater
than [12] [_____] percent when tested in accordance with ASTM D 4318, and
not more than [35] [_____] percent by weight shall be finer than 75
micrometers No. 200 sieve when tested in accordance with ASTM D 1140.]
[Coefficient of permeability shall be a minimum of [0.01] [_____] mm per
second [0.002] [_____] feet per minute when tested in accordance with ASTM
D 2434.]
1.4.10.2
California Bearing Ratio Values
**************************************************************************
NOTE: Where California Bearing Ratio values are
needed include the following paragraph:
**************************************************************************
[Bearing Ratio: At 2.5 mm 0.1 inch penetration, the bearing ratio shall be
[_____] percent at 95 percent ASTM D 1557 maximum density as determined in
accordance with ASTM D 1883 for a laboratory soaking period of not less
than 4 days. [Maximum expansion shall be [_____] percent.] [The combined
material shall conform to the following sieve analysis:]]
SECTION 02300
Page 14
Previous Page
