4
• Use a grindstone to
smoothen the test surface.
(Figure 1)
Preparing the test surface
• Position the concrete test
hammer perpendicular to
the test surface.
• Deploy the impact plunger
(1) by pushing the concrete
test hammer towards the
test surface until the
push button springs out.
(Figure 2) Deploying the impact plunger (1) (model NR)
IMPORTANT: Each test surface should be tested with at least
10 impacts. The individual impact points must be spaced at
least 20mm apart.
Measuring
The device measures the rebound value R. There is a Specific relationship between this
value and the hardness and strength of the concrete.
The following factors must be taken into account when ascertaining rebound values R:
- Impacting direction: horizontal, vertically upwards or downwards
- Age of the concrete
- Size and shape of the comparison sample (cube, cylinder)
Models N and NR can be used for testing:
- Concrete items 100 mm or more in thickness
- Concrete with a maximum particle size
Models L and LR can be used for testing:
- Items with small dimensions (e.g. thin- walle
If necessary, clamp the items to be tested prior to measurement in order to
prevent the material deflecting.
- Items made from artificial stone which are sensitive to impacts.
!gninraW
The impact plunger (1) generates a recoil when it deploys. Always hold the
concrete test hammer in both hands!
The device measures the rebound value R. There is a Specific relationship between this
value and the hardness and strength of the concrete.
The following factors must be taken into account when ascertaining rebound values R:
- Impacting direction: horizontal, vertically upwards or downwards
- Age of the concrete
- Size and shape of the comparison sample (cube, cylinder)
Models N and NR can be used for testing:
- Concrete items 100 mm or more in thickness
- Concrete with a maximum particle size
Models L and LR can be used for testing:
- Items with small dimensions (e.g. thin- walle
If necessary, clamp the items to be tested prior to measurement in order to
prevent the material deflecting.
- Items made from artificial stone which are sensitive to impacts.
Danger!
Always hold the concrete test hammer in
to the test surface, before u trigger the impact!
Each test surface should be tested with at least 10 impacts. The individual
impact points must be spaced at least 20 mm apart.
WARNING
The impact plunger (1) generates a recoil when it deploys. Always
hold the concrete test hammer in both hands!
DANGER
Always hold the concrete test hammer in both hands, perpendicular
to the test surface, before you trigger the impact!
