Fayat Group Dynapac CA25 Instruction Manual page 48

02-17-2021
Operation CMV
The Compaction Meter measures the dynamic
stiffness of the ground and presents a value based on
this. The CMV is influenced by the rolling speed,
rolling direction (forward or reverse), amplitude
setting and vibration frequency. The Dynapac
Compaction Meter (DCM) is less sensitive to small
variation in vibration frequency.
Some CMV references for compacted materials:
Material
Rocking
Gravel
Sand
Silte
Clay
The water content in the compacted soil (not relevant
for rock fill) has a large influence on stiffness, wet soil
will result in low values and dry soil will result in higher
values.
When double-jump occurs, the value CMV will be
reduced, these lower values should not be used to
determine if compaction is ready or not.
NOTE: The operator shall always keep an eye on
where they are driving and not focus too much on the
CMV display, due to safety.
4812325897EN
Operation - Vibration
CMV
40 - 200
25 - 100
20 - 60
5 -30
0 - 80
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