Sieve Size
Percent Passing by Weight
63 mm
100
4.75 mm
40
- 85
2.00 mm
20
- 80
425 micrometers
10
- 60
75 micrometers
5
- 25
Sieve Size
Percent Passing by Weight
2 1/2
inches
100
No.
4
40
- 85
No.
10
20
- 80
No.
40
10
- 60
No.
200
5
- 25
1.4.11
Initial Backfill Material
Initial backfill shall consist of select granular material or satisfactory
materials free from rocks [_____] mm inches or larger in any dimension or
free from rocks of such size as recommended by the pipe manufacturer,
whichever is smaller. When the pipe is coated or wrapped for corrosion
protection, the initial backfill material shall be free of stones larger
than [_____] mm inches in any dimension or as recommended by the pipe
manufacturer, whichever is smaller.
1.4.12
Expansive Soils
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NOTE: Additional laboratory testing and analysis
might be needed to better define site specific
expansive soils. If expansive soils are anticipated
at the construction site, this specification should
be edited to ensure proper construction techniques
are undertaken per TM 5-818-7.
**************************************************************************
Expansive soils are defined as soils that have a plasticity index equal to
or greater than [_____] when tested in accordance with ASTM D 4318.
1.4.13
Nonfrost Susceptible (NFS) Material
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NOTE: Contract specifications for
nonfrost-susceptible fill and backfill will follow
the gradation requirements recommended in TM
5-822-5. For fill under critical structures,
materials with ML, MH, and CH classification will be
specified as unsatisfactory (if at all feasible from
an economic or material-availability standpoint).
If such materials must be used, the specification
will point out the critical nature of the materials
and the control difficulties to be anticipated.
Organic materials and topsoil having OL, OH, and Pt
classification will not be used in fill or backfill.
**************************************************************************
Nonfrost susceptible material shall be a uniformly graded washed sand with
SECTION 02300
Page 15
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