Proceq N Mode D'emploi page 30

Conversion Curves, Concrete Test Hammer Model N/NR
Concrete pressure resistance of a cube after 14 - 56 days
Fig.2.7 Model N/NR: Conversion curves based on the
average compressive strength of a cube and
the rebound value R
fck m: Average pressure resistance of a cube
cube
(probable value)
The concrete test hammers shown in Fig. 2.7
and Fig. 2.8 indicate the impact direction.
8 Measurement
Conversion Curves, Concrete Test Hammer Model L/LR
Concrete pressure resistance of a cube after 14 - 56 days
Fig. 2.8 Model L/LR: Conversion curves based on the
average compressive strength of a cube and
the rebound value R
Limits of Dispersion
fck : The max. and min. values are set so 80% of all
cube
test results are included.
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