RA 100 Concrete
Model 1.0390
8
The fck-cube compressive strength value is used for the target display (first column next to the
diagram) for comparison with the measurement. The maximum grain display is not used directly,
it indirectly influences an otherwise determined calibration correction factor, which is listed in the
last column of the sort list and corrects the determination of compressive strength according to
empirical experience.
x y/d z
Describes the sample shape for calculating the velocity of sound from the resonant frequency
and is used to calculate the sample volume required for density calculation if the sample weight
is entered.
x and y/d describe the base area, z the sample height. If x = 0, x/d input means the diameter of a
cylinder, if x is entered a value, x/d means the second side of a base area rectangle (the sample
then corresponds to a rectangular or square prism, or even a cube).
Example:
300mm standard cylinder
x = blank
y/d = 150
z = 300
160mm standard prism
x = 40
y/d = 40
z = 160
150mm standard cube
x = 150
y/d = 150
z = 150
Weight. De.calc. De.man.
If a weight is entered in the first input cell, the program determines the density with the calculated
volume. If the weight is 0, a density value must be entered manually in the rear input cell or the
value there is taken.
Frequency from to
Here are the frequencies that can be changed at any time (also after the measurement) and
between which a resonance is sought. This area is also used for the adjacent graphic.
Recommendations for common sample shapes:
150mm cube sample: 3500 Hz - 9500 Hz
300mm cylinder sample: 3000 Hz - 9000 Hz
160mm prism sample: 10000 Hz - 16000 Hz
These settings cover the most common varieties.
For very soft or very hard samples the frequency window must be shifted up or down.
