Concrete Strength Tester / Highly Durable Measuring Device /
very easy to use / conversion table on the back /
with different impact energies
This measuring device for construction materials operates on the Schmidt principle. In addition to its primary use in the construction sector, this easy-to-use construction material measuring device is also used for other purposes in many other industries (testing the hardness of product windings on a reel, …).
The test is performed with a constant impact energy of 0.735 J. The initial kinetic rebound energy is expressed as a measure of concrete hardness, surface pressure, or compressive strength (kg/cm² or converted to N/mm²) on a building materials testing machine. The quality of concrete is primarily assessed based on its compressive strength, as this is directly related to the load-bearing capacity and durability of concrete structures. The construction materials testing device applies significantly less impact energy to the concrete, making it particularly well-suited for testing thin-walled elements with a material thickness of up to 100 mm.
Compressive strength is indicated by a sequence of letters and numbers. Example: B 25 means that this is ordinary concrete with a compressive strength of 25 N/mm². There are various intermediate values up to the highest strength class, B 55. This allows for easy, fast, and accurate classification using a construction materials testing device. The concrete testing device is always delivered factory-calibrated upon order, but upon request (for an additional fee), it can also be calibrated in a laboratory and provided with an ISO test certificate or a test certificate.
General information on measuring the compressive strength of concrete using the
construction materials testing device. Compressive strength is generally defined as the breaking strength measured under a uniaxial, short-term compressive load. The compressive strength of concrete is primarily determined by the following factors:
– Cement stone strength
– Concrete composition and compaction
– Age and curing conditions
– Test specimen shape and dimensions
– Loading type and duration
Compressive strength is traditionally determined in a laboratory using concrete cubes or circular cylinders. For balloons, it is recommended to apply a leveling layer—which is usually necessary to achieve a flat and smooth upper compression surface—immediately after removing excess concrete. The cylinders should be allowed to harden while standing.
Since laboratory-based hardness testing is not feasible in practice, an easy-to-use and relatively accurate construction material testing device is used here. Compressive strength is determined by measuring the hardness of the material using a construction material testing device (rebound value R) on the concrete surface and referring to the conversion table (on the back of the device) or the table provided in the user manual.
Features
– durable measuring device
– conversion table on the back
– long service life
– impact energy 0.735 J
– correction guide in the user manual
– lightweight
| Nominal kinetic energy | 0.735 J (0.735 Nm) |
| Adhesion of the measuring tip | 0.4 … 0.6 N |
| radius of the spherical tip | 25 mm ±1 mm |
| Average recoil value | 74 ±2 |
| Spring extension | 75 mm ±0.3 mm |
| Dimensions | Diameter 54 x 268 mm |
| Weight | 1 kg |
1 x round grinding wheel
1 x plastic carrying case
1 x user manual
