PCE Instruments PCE-HT-75 Hardness tester

Hardness tester for determining the concrete strength / very robust measuring device / easiest use / with conversion table on the back / with different impact energy of the concrete testing hammer works according to the principle of Schmidt. In addition to the essential use in construction and construction, the easy-to-use concrete test hammer is also used in many other industries for purposes other than intended (winding hardness testing of products on a roll, ...). The test is carried out under an always equal impact energy of 0.735 J. The initial kinetic rebound energy is specified as a measure of the concrete hardness / surface pressure or pressure strength (kg/cm² or converted to N/mm²) on the concrete test hammer. The quality of concrete is mainly assessed on the basis of its compressive strength, since it is directly decisive for the load-bearing behavior and durability of concrete constructions. The concrete test hammer provides a significantly lower impact energy on the concrete, which is why it is particularly suitable for testing thin-walled elements up to a material thickness of 100 mm. The compressive strength is indicated by a sequence of letters and numbers. Example: B 25 means that this is normal concrete with a compressive strength of 25 N/mm². There are various intermediate values up to the highest strength class B 55. In this way, you can make a classification simply, quickly and accurately with the help of the concrete testing hammer. The concrete test device is always delivered factory-calibrated when ordered, but can also be optionally (at an additional cost) laboratory-calibrated and equipped with an ISO test certificate / test certificate. General information on the pressure strength measurement of concrete with the concrete test hammer under the pressure strength is generally understood to be the breaking strength measured under single-axle, short-term pressure load. The pressure strength of the concrete is determined mainly by the following influencing variables: - the strength of the cement stone - the composition and compression of the concrete - the age and the storage conditions - the design and dimensions of the test body - the type and duration of the load The pressure strength is determined classically in the laboratory on concrete cubes or circular cylinders. For cylinders, it is recommended to apply the calibration layer that is usually required to achieve a plane and a smooth upper pressure surface immediately after the protruding concrete has been painted. Cylinders should harden standing. Since in practice a hardness test according to the laboratory method is not feasible, the easy-to-use and relatively precise concrete test hammer is used here. The compressive strength is determined by measuring the material hardness using the concrete test hammer (rebound value R) on the surface of the concrete and using the conversion table (on the back of the device) or taken from the table in the operating instructions.

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