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Concrete Rebound Hammer

The Proceq rebound hammer is a device to measure the elastic properties or strength of concrete or rock. Each rebound hammer is built for a different purpose in order to meet the specific needs of the customer.

Proceq invented the world’s first and now most widely used equipment for analyzing concrete strength properties, the Original Schmidt. This rebound hammer is available in models with different impact energies, each designed for a specific test application.

The SilverSchmidt ST/PC is the latest generation of rebound hammer combining the ground breaking features of the OriginalSchmidt with the best of today’s technology. It’s the first integrated rebound hammer featuring true rebound value and unmatched repeatability.

Besides showing the basic settings on the included display unit, the rebound hammer DigiSchmidt offers the transmission of the measured data to a standard printer or to a PC. The window based software ProVista allows downloading, presenting and editing of the measured values in a fast and easy way. This rebound hammer is menu-guided in different languages.

The rebound hammer meets the customers' needs for in-site measurement of concrete quality and compressive strength.

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The quality of concrete is mainly judged by its compressive strength directly affecting the load-bearing capacity and durability of concrete structures. Proceq invented the Original Schmidt, the world’s first and now most widely used test hammer for analyzing the compressive strength of concrete properties.

The Original Schmidt will hit the concrete at a defined energy whereas its rebound is dependent on the hardness of the concrete and is measured by the instrument. The Original Schmidt is available in models with different impact energies, each test hammer designed for a specific test application, in order to meet the needs of the customers to investigate a wide range of material types and sizes, such as bridge decks, thin walls, cast stone components or small components

Features
  • Type N Original Schmidt: Rebound values are read from a scale for subsequent calculation of the mean. Compressive strength values can be read from a conversion diagram
  • Type NR Original Schmidt: Rebound values are recorded as a bar chart on a paper strip which has a capacity for 4’000 test impacts
  • Type L Original Schmidt: Handling equals type N, but the type L offers an impact energy three times smaller
  • Type LR Original Schmidt: Handling equals type NR, but with impact energy three times smaller. The LR also features a paper strip for recording up to 4’000 test impacts without reloading

Applications
  • The Original Schmidt is used for the non-destructive measurement of the concrete/mortar compressive strength characteristics
  • Control of uniform concrete quality
  • Detection of weak spots in the concrete
  • The type L/LR Original Schmidt operates with significant lower impact energy, making this test hammer the ideal option for testing thin walled items with a thickness between 50 to 100 mm (2 in. and 4 in.) or for analyzing small components.
  • It is suitable for examining cast stone components which are sensitive to impact. In rock mechanics, the type L/LR Original Schmidt is commonly used for the classification of rock cores and brittle rock
Technical Data
  • Original Schmidt
    Type N
    Original Schmidt
    Type NR
    Original Schmidt
    Type L
    Original Schmidt
    Type LR
    Measuring range10 - 70 N/mm2 (1'450 to 10'152 psi)
    Impact energy2.207 Nm
    0.735 Nm
    Paper stripNoYesNoYes

Additional Information:
  • Item Code: Original_Schmidt
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The SilverSchmidt ST/PC is the first integrated concrete test hammer featuring true rebound value and unmatched repeatability.
Two factors contribute to the improved performance of this concrete test hammer over its predecessors:

  • Velocity based detection of the rebound quotient
  • The lightweight hybrid design of the impact plunger is made from aerospace alloy, matched to the elastic properties of the concrete and equipped with a hardness steel cap
Independent validation testing by BAM (Federal Institute for Materials Research and Testing, Germany) has shown the SilverSchmidt ST/PC to have less dispersion than the classical concrete test hammer over the entire range.
The unique design and high quality construction of the concrete test hammer SilverSchmidt ST/PC makes rebound hammer testing quicker and more accurate than ever before

Features
  • The SilverSchmidt ST/PC concrete test hammer combines a high measurement accuracy with an unmatched repeatability.
  • The rebound value requires no angular correction
  • The concrete test hammer offers customer conversion curves for a wide range of compressive concrete strengths, including low fc (<10 N/mm2, 1’450 psi) and high strength concrete (up to 100 N/mm2, 14’500 psi)
  • A large number of measurement points can be easily collected by the concrete test hammer and automatically evaluated according to statistical data
  • The concrete test hammer offers automatic conversion to the required measurement unit (MPa, N/mm2, kg/cm2, psi)
Applications
  • Ideally suited for on-site tests of concrete
  • The concrete test hammer is suitable for testing a wide variety of concrete, mortar and rock
  • Handy for difficult to access or confined test areas (i.e. working overhead)
  • Assessment on young, soft concrete with mushroom plunger of the concrete test hammer
Technical Data
Mechanical dataType ST N / PC N
concrete test hammer
Type ST L / PC L
concrete test hammer
Impact energy2.207 Nm0.735 Nm
Hammer mass135 g135 g
Spring constant0.79 N/mm0.26 N/mm
Spring extension75 mm (2.95”)75 mm (2.95”)
Housing dimensions55 x 55 x 255 mm (2.16” x 2.16” x 9.84”)
Weight570 g (1.3 lb)
PC application
Only for the concrete test hammer SilverSchmidt versions PC N and PC L: Hammerlink Software
Electrical data

Display17 x 71 pixels; graphic / alphanumeric
Power consumption~13 mA measuring, ~4 mA setup and review, ~0.02 mA idle
Battery life>5000 impacts (before recharging)
Charger connectionUSB type B (5V, 100 mA)
Measuring ranges
Concrete compressive strength10-100 N/mm2 (1450-14500 psi)
Operating temperature0 to 50 °C (32 to 122 °F)
Storage temperature-10 to 70 °C (14 to 158 °F)
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The Schmidt Hammer Digi-Schmidt was developed for the non destructive measurement of the concrete compressive strength and controlling the uniform concrete quality.

Besides showing the basic settings on the included display unit, the Schmidt Hammer offers the transmission of the measured data to a standard printer or to a PC. This supersedes the time consuming business of note taking allowing the user to focus on the essential. The window based software ProVista allows downloading, presenting and editing of the measured values in a fast and easy way.

The Schmidt Hammer is equipped with a sensor which measures the rebound value of a test impact to high resolution and repeatability. With the Schmidt Hammer, various parameters such as impact direction, form factor and time factors such as carbonation depth can easily be set.

Features
  • The Schmidt Hammer offers automatic calculation of the compressive strength
  • Storage of customized conversion curves
  • Data evaluation and storage as well as transmission to a PC with ProVista software are possible with the Schmidt Hammer
Applications
  • Schmidt Hammer Type ND: Suitable for use on concrete components of 100 mm (3.94 in.) thickness or more
  • Schmidt Hammer Type LD: Suitable on concrete components of thickness less than 100 mm (3.94 In.) or on cast stone material
  • Both versions of the Schmidt Hammer are ideally suited for systematic high volume measuring and the detection of weak spots in the concrete as well as for the control of uniform concrete quality
Technical Data
Schmidt Hammer
Type ND
Schmidt Hammer
Type LD
Schmidt Hammer
Impact energy2.207 Nm0.735 Nm
Measuring range
Concrete compressive strength
10 - 70 N/mm2
1'450 - 10'152 psi
18 - 70 N/mm2
2'610 - 10'152 psi
Display Unit
Displaygraphic LCD-Display 128 x 128 pixel
Internal data storagenon-volatile memory, 250 measurement series of 10 measurements each
CommunicationRS 232 or with adapter to USB
PC applicationProVista
Battery typesix LR6 (AA) batteries, 1.5 V for 60 h operation
Operating temperature0 °C to +60 °C
Storage temperature-10 °C to +60 °C

Additional Information:
  • Item Code: DigiSchmidt
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