MMP20 SONO-DIS (option D)
Page 36
Hauser
Measurement of earth-dry fresh concrete (i.e. no-slump,
stiff concrete) with F1 consistence
Stiff fresh concretes with a consistence class of F1 have large air pockets and cannot be measured
with the SONO-WZ lance probe. For such applications, the manufacturer is planning to develop a
measuring procedure where water would be subsequently added to a 10 liter bucket of stiff F1
concrete to produce class F3 concrete. Concrete of consistence class F3 can be measured with
SONO-WZ.
After measuring the F3 concrete, a special mathematical formula could be used to calculate the
value back to the water content of the earth-dry F1 concrete.
More information is available on request!
The three types of water measured by SONO-WZ
In principle, SONO-WZ measures the same parts of water as the kiln-drying method.
1. The free water
in the concrete mix which
enters into the calculation of the w/c-ratio.
This water is the actual target value that is sought
when using the SONO-WZ.
2. A share of the core water,
water that is absorbed
by the aggregates. SONO-WZ can only measure a
share (approx. 1/3) of the core water here. The core
water can be between 5 and 35 liters per m
3
depending on the type of rock. This (correction) value
is represented in the
G-Set
parameter (approx. 2/3 of
the core water), depending on the formulation and
rock. The G-Set value is typically -10 liters/m
3
assuming a typical core water value of 15 liters/m
3
.
These -10 liters/m
3
are automatically subtracted
from the measurement in SONO-DIS so that the
reading in SONO-DIS matches the effective water
content.
3. Additives
that behave like water are also
measured by the SONO-WZ.
This must be taken into consideration.
