Table 8-5.1 Summary of Compaction Criteriaa
Fill and Backfill
Typical Equipment and Procedures for Compaction
Soil
Soil
Degree of Compaction
Equipment
No. of Passes
Comp. Lift
Placement Water Content
Field
Group
Types
or Coverages
Thickness
Control
mm (in)
Rubber tired Rollerb
2-5 Coverages
200 (8)
CM
90 to 95% of
Optimum water content
Control
CE55
tests at
e
Sheepsfoot Roller
4-8 Passes
150 (6)
CC
maximum
intervals to
Power hand Tamperd
Indefinite
100 (4)
density
determine
SM
degrees of
SC
compaction
(A)
Optimum water
ML
Rubber tired rollersb
2-4 coverages
250 (10)
85 to 90% of
(A) Control
content
CE55
tests as
e
CL
Sheepsfoot Roller
4-8 passes
200 (8)
maximum
shown
(B) Observation: wet side
Crawler-type Tractorc
3 coverages
150 (6)
OL
density
maximum water content at
(B) Field
Power hand tamperd
Indefinite
150 (6)
which material can
OH
control via
satisfactorily operate; dry
Controlled routing of
Indefinite
150-200
visual
MH
side minimum water
construction
(6-8)
inspection
content required to bond
CH
equipment`
of process
particles; must not result
in voids or honey-combed
materials.
Note: The above requirements will be adequate in most construction venues. In special cases where tolerable settlements are unusually small, it may be necessary to
employ additional compaction equivalents to 95-100% of compaction effort. A coverage consists of one application of the wheel of a rubber tired roller or the treads of a
crawler type tractor over each point in the area being compacted. For a sheepsfoot roller , one pass consists of one movement of a sheepsfoot roller drum over the area
being compacted.
e)
From TM 5-818-1
f)
Rubber tired rollers having a wheel load between 80 and 111 kN (18,000 and 25,000 lb) with a tire pressure between 552-689 kPa (80-100 psi).
g)
Crawler type tractors weighing not < 89 kN (20,000 lbs) / exerting a foot pressure not < 4.5 kPa (6.5psi).
h)
Power hand tampers weighing more than 0.44 kN (100 lbs) / pneumatic or gasoline powered.
e) Sheepsfoot roller with a foot pressure between 1724-3448 kPa (250-500 psi)/ tamping feet 180-250 mm (7-10 in) long/ face area between 4500-10300 mm2
(7-16 sq. in. )
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