MMP20 SONO-DIS (option D)
Page 14
Hauser
Fine C
_
Grading curves C
SONO-WZ measures
slightly too little water
and therefore has to
correct the water content
upwards slightly.
Normal B
_
Grading curves
B
No or minor
correction
Coarse A
_
Grading curves A
SONO-WZ measures slightly
too much water and therefore
has to correct the water
content downwards slightly.
Special U
_
Gap-graded U
SONO-WZ measures
too much and
therefore has to
correct the water
content downwards.
Concretes with a high
mortar content, i.e. a lot
of sand, particularly with
a high fines content, a lot
of cement.
Standard admixtures,
standard additives as
well as PCEs.
Constant and
relatively
well-distributed
grading curves.
Standard
admixtures,
standard
additives as well
as PCEs.
•
Concretes with higher
k-values and low mortar
content.
•
Concretes with constant
and relatively
well-distributed B-grading
curves with one
peculiarity:
low target
water content that is less
than 160 liters/m
3
, and
large amounts of
superplasticizers (PCE)
which improve general flow
characteristics/rheology.
Gap-graded U:
i.e.
little or no gravel of
size 2/8mm or
4/8mm.
Standard
admixtures, standard
additives as well as
PCEs.
General G-Set parameter
SONO-WZ measures both the free effective water in fresh concrete
and a share of the core water
or absorbed water
. While there are types of rock that absorb very little core water, there are
aggregates, such as sandstone or lime grit, that can absorb up to 50 liters of core water. The core or
absorbed water is not used to bind the cement and is therefore not processed for the w/c-ratio.
8.2.1.1
SONO-WZ measures three types of water
In principle, SONO-WZ measures the same parts of water as the kilning 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 10 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 concrete
formulation and rock. The G-Set value is typically
approx. -10 liters/m
3
assuming a core water content
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.
