Page 300 - Geotechnical Engineering Soil and Foundation Principles and Practice
P. 300
Compaction
Compaction 295
Figure 13.12
Contours show volume changes from wetting of a compacted silty clay. Compaction within usual
specification limits (shown by the heavy arrows) results in negligible volume change if the soil is
not highly expansive. (After Lawton et al., 1992.)
Figure 13.13
Relation of
compaction energy
to moisture
content,determined
from energy data
along the
95 percent density
line in Fig. 13.12.
13.7.4 Compacting for Low Permeability
In applications such as in the confined core of an earth dam where low
permeability is more important than strength, the moisture content requirement
usually is 0 to þ2 percent or þ4 percent above the OMC.
Compacting on the wet side of the OMC also can save time and fuel by reducing
the required compactive effort. In Fig. 13.13 about 65 percent of the standard
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