DCA-S - Dynapac

Dynapac Documentation System
Soil Compaction

Dynapac Documentation System
Dynapac’s experience of surface covering compaction control
dates from the late 70s. Since then we have offered our
customers the opportunity to control the compaction work
in real time and to document the completed work for improved
quality control, from the first display instruments via belt
printers and simple computers to today’s advanced but still
user-friendly systems.
The compaction meter registers the movement of the drum in
the vertical plane. This movement changes as the compaction
increases and the rigidity of the underlying surface increases.
In principle it can be compared with bouncing a golf ball on
different surfaces. On loose surfaces (non-compacted sand)
there is basically no bounce, while on a hard surface (concrete)
there is a very good bounce. The better the bounce, the higher
the CMV. We do not know, however, exactly how high the
Dynapac’s documentation system is built up in three levels. At
the basic level there is the compaction meter. This can then be
expanded with increasingly more advanced documentation
tools in the form of computers mounted on the roller with different
positioning systems. The compaction meter consists of
the following main parts:
1. Sensor (accelerometer)
2. Processor unit
3. Display instrument
The sensor registers the vibratory movement of the roller and
this information is then transferred to the processor, where it is
analysed. The analysed information is presented on the display
instrument as a digital value, CMV (Compaction Meter Value).
A high or low measurement range (CMV 0-150 and 0-50) can
be selected with a switch on the instrument panel.
The compaction meter provides a relative measurement of
rigidity of the surface. This increases with an increase in the
compaction and is reflected in a rising CMV. An accelerometer
continuously measures the compaction forces that occur as
the vibratory drum works the surface. The signals from the accelerometer
change as the surface becomes harder and more
stable. The signals are then converted via a patented principle
to values that can be read on the roller’s instrument panel. The
compaction meter value (CMV), which is non-dimensional, can
be calibrated to the test method used for acceptance inspection
(degree of compaction, deformation module (Ev2) ETC). Each
new compaction job is therefore initiated by compacting test
areas to different levels and in this way correlating CMV to the
degree of compaction.
DCA is an abbreviation of Dynapac Compaction Analyzer. It
registers all the CMV data and allows the operator to see the
compaction results on the computer screen. On the basis of
experience or an existing calibration, the CMV limiting value
can be used for each separate compaction job. The DCA will
then indicate precisely which areas require additional compaction.
The computer gives the operator a graphic image of
the completed compaction work. Variations in CMV are shown
as different colours on the surface and it is therefore easy to
identify weaker areas and take the requisite action. In most
Background
Introduction
bounce is (or how well-compacted the area is). This requires
the compaction meter to be calibrated to the static flat load
or the density values.
Regardless of whether the system has been calibrated or not,
the roller operator continuously receives information on the
increase in the compaction, whereby an increasing CMV means
an increase in the compaction. When the increase in CMV
levels off you start to approach the limit to what the machine
can achieve on the surface in question, and further compaction
can be uneconomic or even damaging.
The compaction meter also gives an indication as to whether the
area is uniformly compacted (the same CMV over the entire area)
or if the surface has irregular rigidity (large variations in CMV).
cases it is sufficient to make additional runs over an area to
achieve satisfactory compaction, but some areas may need
to be improved by excavating poor material and replacing it
with new material.
The DCA unit is portable and the measurement results can
therefore be taken into the office and studied. It is also easy to
transfer the measurement data to a standard PC by means of
a memory card so that it can be permanently stored.
Compaction meter
The display instrument gives the roller operator continuous
information on the increase in compaction and any weak areas.
At the end of the compaction work the CMV stabilises and the
Bouncing warning starts to flash. This indicates that the machine
cannot significantly improve the compaction and that further
runs are uneconomical.
Compaction meter with DCA
The same function as above, but with the opportunity to document
the end results for quality assurance and as an indication
for acceptance inspection. The DCA can be set to show two or
more surfaces with the lowest CMV (least bearing strength).
The compaction documentation is stored in the computer and
can easily be transferred to other computers for more detailed
analysis or printout. It is also possible in DCA to calibrate CMV to
static flat loads, and thereby obtain a receipt when the correct
compaction has been achieved.
Compaction meter with DCA-GPS
The same function as above, but all the runs can be documented
which gives the roller operator full control of the increase
in compaction over the entire area. The DCA also shows the
position of the roller in relation to a selected reference line for
the section, which eliminates the need for extra setting out
to orientate the operator. The analysis function enables the
compaction work to be replayed to assess if the roller has been
used efficiently or if the roller pattern needs to be optimized.
At the same it is possible to see how many runs have been allocated
over the surface and which CMV have been achieved.
The results from the acceptance inspection can be entered in
the DCA so that the results from quality control can be collected
together in one place.

2
CMV
3
1
2
3
1
Rock
Compaction meter
A Dynapac roller with a compaction meter is much
more than just a compaction machine. The compaction
meter gives the roller operator information on
the increase in compaction for each run, it shows
variations in the rigidity of the underlying surface,
it can localize weak areas, and it indicates when the
material is fully compacted. The compaction meter
also tells the roller operator if the roller does double
jumps, which can damage both the roller and the
compacted material. Avoiding double jumps save
both time and money. The compaction meter also
helps to avoid an unnecessary number of runs,
which reduces both fuel consumption and wear
on the machines.
Sensor (accelerometer)
A sensor (1) sits on the vibrating part, which continuously registers
the movement of the drum. The signals from the sensor are
sent to a processor unit (2), where they are processed.
Processor unit
Clay
The signals from the sensor (1) are processed in a processor (2)
and presented as CMV (compaction meter value) on the instrument
panel (3).
Display instrument (CMV instrument)
The CMV indicates the rigidity of the compacted material. The
higher the CMV, the more rigid and more compacted the material
is. When CMV no longer increases during additional runs this
means that maximum compaction has been reached during the
present conditions.

Compaction meter and DCA-S
A Dynapac vibratory roller with compaction meter and DCA-S is a
reliable system for the control of compaction, and thereby guarantees
first-rate quality in your next project.
The operator can continuously read the compaction results on
his instrument panel. As opposed to conventional measurement
methods, the compaction meter provides continuous measurement
results and not only random samples as before.
The Dynapac Compaction Analyzer registers all the measurement
values from the compaction meter, while at the same time
the operator can see the compaction results immediately on the
computer screen.
Dynapac has developed this unique combination so that the
compaction will be correct from the very start.
A genuinely profitable machine!
2
3
Careful compaction of each layer of soil provides a significant
improvement of the bearing strength of the earth materials. A uniform
bearing strength in each layer prevents uncontrolled settlements in
the future.
Correctly used, a vibratory roller is the perfect machine for
compaction work. If, moreover, you can use the same machine for
compaction control it is an excellent instrument in the compaction
process. It helps you to localize areas where additional compaction
is needed to achieve uniformity and satisfactory compaction characteristics.
5
4
1

CMV
140
120
100
80
60
40
20
Rock Clay
10 20 30 40 50
1
2
3
4
5
The Drum accelerometer registers the compaction.
The Rear axle sensor registers the longitudinal
position.
The Processor processes the signals from the accelerometer.
The compaction meter measures the bearing strength
of the surface in CMV, where CMV stands for Compaction
Meter Value.
The results of the compaction are shown directly on the
screen of the portable DCA unit. The measurement values
can easily be transferred to a desktop computer by means
of a memory card.

Compaction meter and DCA-S (GPS)
A Dynapac vibratory roller with compaction meter and DCA-S
(GPS) is a reliable system for the control of compaction, and thereby
guarantees first-rate quality in your next project.
The operator can continuously read the compaction results on
his instrument panel. As opposed to conventional measurement
methods, the compaction meter provides continuous measurement
results and not only random samples as before.
The Dynapac Compaction Analyzer registers all the measurement
values from the compaction meter, while at the same time
the operator can see the compaction results immediately on the
computer screen.
Dynapac has developed this unique combination so that the
compaction will be correct from the very start.
A genuinely profitable machine!
2
3
A Dynapac Compaction Analyzer means that:
· The compaction energy can be concentrated to the ground surfaces
that need additional compaction.
· No unnecessary compaction of already finished surfaces.
· The risk of inferior or exaggerated compaction is eliminated.
· Each stage of the compaction work is documented, and high-quality
documentation of the compacted area is obtained immediately.
In other words you now have a much greater opportunity to achieve:
· First-rate compaction results with maximum uniformity in terms of
the bearing strength of each layer.
· Simple quality assurance.
· More efficient compaction.
· The best possible economy for both contractors and purchasers.
5
4
6
1

CMV
140
120
100
80
60
40
20
Rock
1
2
3
4
5
6
Clay
10 20 30 40 50 60
70
The Drum accelerometer registers the compaction.
The Rear axle sensor registers the longitudinal
position.
The Processor processes the signals from the accelerometer.
The compaction meter measures the bearing strength
of the surface in CMV, where CMV stands for Compaction
Meter Value.
The results of the compaction are shown directly on the
screen of the portable DCA unit. The measurement values
can easily be transferred to a desktop computer by means
of a memory card.
The roller is in contact with a positioning system via the
GPS aerial on the roof, which explains exactly where
the machine is.

Functions of the Compaction Meter
· Continuous measuring of the rigidity of the underlying surface.
· Warns the operator of double jumping/overcompaction.
Dynapac Compaction Analyzer
· Two measurement scales, CMV 0-50 for fine-grained material and CMV 0-150 for the rest.
Functions of DCA-S
In addition to the functions of the Compaction Meter:
· Continuous registering of measured values.
· Calibration to Ev2 ETC.
· Search function to localize the weakest areas for acceptance inspection.
· Graphic presentation of the compaction results during the compaction work.
· Integrated analysis function.
· Printout function.
Functions of DCA-S (GPS)
In addition to the function of the compaction meter and DCA-S:
· Integrated conversion of WGS84 coordinates to local coordinate system.
· Absolute positioning of measured values in local coordinate system.
· A digital road line model provides the roller operator with information on the current position (section/lateral measurement).
Compaction meters DCA-S and DCA-S (GPS) are installed in the following machines (factory fitted or post-factory fitted)
· CA 150/250/260/280 (compaction meter only)
· CA 152–702
Dynapac Compaction Equipment AB, Box 504, SE-371 23 Karlskrona, Sweden. Tel: +46 455 30 60 00, Fax: +46 455 30 60 30
We reserve the right to change specifications without notice. Photos and illustrations do not always show standard versions of machines.
The above information is a general description only, is not guaranteed and contains no warranties of any kind.
3492 0033 01 - February 2009