MMP20 SONO-DIS (option D)
Page 24
Hauser
We recommend you take 4 to 5 measurements, inserting the probe each time at the side of the
bucket at different points, spaced at intervals of 70° to 90°.
Please note the following:
•
There should not be any residue of old concrete
around the ceramic on the probe surface. Clean
the surface with a wire brush if necessary.
•
The amount of concrete in the bucket should be
at least 3cm higher than the length of the probe
head (<18cm). For concrete with a high water
content, it is particularly important to ensure
that the concrete does not segregate during or as
a result of the measurement.
•
Insert the probe head fully into the concrete at
a slight angle at the edge of the bucket. Tap the
side of the bucket with your foot to make the
concrete more compact around the probe.
This ensures that the fresh concrete is optimally
packed around the probe surface for the
measurement.
Measurement procedure for concretes with flow class F2, F3, F4
After inserting the probe, perform a single measurement at
this position. Then remove the probe from the bucket. When
the probe is removed from the concrete, the fresh concrete can
segregate at this point and fine particles can enter the cavity.
Therefore, insert the probe at the edge of the bucket again - as
explained under Point 3 - spacing the probe approx. 70°- 90°
from the previous position. Tap the side of the bucket
(e.g. with your foot) to make the concrete more compact
around the surface of the probe. Take another measurement
here. Repeat this process 4-5 times, making sure each time to
insert the probe at the side of the bucket, offset by
approx. 70° to 90° from the previous measuring point.
In the case of concrete that "sticks", the dark ceramic
surface of the probe should be wiped clean before each
measurement to ensure that concrete residue "sticking" to
the surface of the probe does not falsify the measurement.
Concretes with a flow class of F2, F3 and F4 do not segregate
so easily. Therefore, this measuring method of inserting the
probe at the side and tapping the side of the bucket to pack the
concrete delivers the best possible measurement results.
For relatively stiff F2 concrete, it may be necessary to place
the bucket, together with the probe, on a shaking table to
compact the concrete before the measurement.
