Page 308 - Geotechnical Engineering Soil and Foundation Principles and Practice

Compaction
Compaction 303

Figure 13.18
Nuclear density
gauge. For
transmission
measurements the
probe is lowered
the desired
distance into a
hole previously
prepared in the
soil. (Photo
courtesy Dr. David
White.)

Figure 13.19
Principle of nuclear
density-moisture
content testing
device for
monitoring field
compaction
operations.

13.11.4 Nuclear Determinations of Moisture Content

Moisture contents are determined using a fast neutron source that is incorporated
in the same instrument, shown diagrammatically in Fig. 13.19. As neutrons

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