Geoscience Reference
In-Depth Information
•
The compaction level may be related to a specified value of CBR strength.
Figure 12.2
Effect of sheepsfoot roller on clays and sands (Here from Holts and Kovacs, 1981 Spangler
and Handy, 1982).
12.14 Required compaction
•
Relative compaction is the ratio of the field density with the maximum dry density.
•
The relative compaction is required in an end product specifications.
•
Typically many specifications simply use 95% relative compaction. The table
shows that this should vary depending on the application. The table is therefore
Table 12.14
Required compaction level based on various soil types (adapted
and modified from Sower's 1979).
Required compaction (% Standard MDD)
Soil
classification
Soil type
Class 1
Class 2
Class 3
Class 4
Class 5
Rock sizes
60 mm
Compaction standards do not apply
GW
96
94
GP
Gravels
-
GM
-
GC
90
SW
98
SP
96
Sands
SM
92
SC
100
ML
Low plasticity
fine grained
CL
88
OL
98
92
MH
-
96
High
plasticity
fine grained
CH
OH
-
Search WWH ::
Custom Search