Schmidt Hammer Test ASTM: Concrete Test Hammer Guide
This Concrete Test Hammer is for fast, inexpensive, nondestructive estimation of in-place concrete strength. Used in accordance with ASTM and BS test methods to ensure reliable results. Hammer tests will help you know where to take test cores and locate damage from freezing or fire.
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Impact energy: 2.207 Nm
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Measurement range: 10 to 70 N/mm2
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Aluminium case, complete with carrying case, grinding stone and instruction manual
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Case dimension: 190x100x350 mm
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Weight approx.: 1.5 kg
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Hammer is suitable for all concrete strengths and applications.
Included calibration curves provide estimated strength from rebound number, but accuracy of test hammers is improved by user produced laboratory correlations with compression tests on the same type of concrete being tested. Rebound numbers are calculated from standardized procedures. Concrete strength is determined by testing multiple areas of the concrete surface to ensure uniformity and accuracy. Plastic case and rubbing stone included.
To use, hammer is pressed against the concrete surface to perform the test with specialized non destructive concrete testing concrete testing equipment.
Concrete Testing
Concrete testing is an essential part of the industry to ensure structures meet safety, durability and performance standards. Among the many methods available, the rebound hammer – also known as test hammer or Schmidt hammer – is the fastest way to assess concrete strength directly on the concrete surface. This non-destructive tool measures the number which is empirically linked to the compressive strength of hardened concrete. By using rebound hammers, construction professionals can quickly check in-place concrete for construction purposes without causing any damage. In addition to the rebound hammer, other types of concrete equipment, such as penetration resistance testers and ultrasonic pulse velocity systems, are used for different properties of concrete. The results from these tests are crucial to determine if the concrete meets the requirements for its intended use and to comply with industry standards. Reliable and accurate concrete testing ensures quality and integrity of construction projects, it’s an essential part of the building process.
Factors to Consider
The accuracy of rebound hammer test results depend on several factors. The type of rebound hammer used can affect the values as different tools have different impact energies and characteristics. Surface preparation is important; the concrete surface should be smooth, clean and free from dust or loose particles to ensure the rebound values reflect the compressive strength of the concrete. Operator technique is also crucial; consistent angle, force and positioning during is required for reliable results.
Other such as age and moisture content of the concrete, and any surface treatments or coatings can affect the test results. To get accurate results, use calibrated equipment, follow standard procedures and consider the concrete. Carrying the rebound hammer and equipment in a case helps to protect the tools and maintain their reliability. Calibrating regularly and following standards such as BS and ASTM will further improve the test results. By understanding these, you can ensure the rebound hammer gives you trustworthy information about the compressive strength and quality of the concrete.
