Concrete Testing Hammer, Rebound, Type N

Concrete Test Rebound Hammer, Type N

Meet the Concrete Test Hammer - a tough tool to test concrete rebound. For contractors, engineers and builders who need to quickly and easily test concrete strength and durability.

Rebound hammers, also known as concrete test hammers or Schmidt hammers, are used to measure the quality and strength of hardened concrete.

What is a Concrete Test Rebound Hammer?

A concrete test rebound hammer, also known as a Schmidt hammer, is a non destructive testing tool to measure the surface hardness of concrete. This tool is necessary to test the quality of hardened concrete and estimate the compressive strength. Its portability and ease of use makes it a must have for construction professionals, engineers and researchers. Simply strike the concrete surface with the hammer and you can get the data of the material strength and durability, so concrete structures meet the standards.

History and Development of Rebound Hammer

The concrete test hammer was invented in 1954 by Ernst O. Schmidt, a civil engineer from Zurich, Switzerland. Schmidt saw the need for a reliable way to test concrete strength and developed this tool. Later Antonio Brandestini commercialized it through his company Proceq. Proceq has since become the leader in production and research of concrete test hammers. Over the years the rebound hammer has evolved with new models and integration of advanced technologies like accelerometers and optical encoders to improve its accuracy and functionality.

When to Use a Concrete Test Rebound Hammer

A concrete test rebound hammer is a must have tool to estimate the compressive strength of concrete in many applications. It is used to test building foundations, roads and bridges. It is also used to monitor the effect of environmental factors like temperature and humidity on concrete strength. The hammer is useful for testing concrete in confined spaces like tunnels and pipes and to test concrete in existing structures. Its quick and reliable data makes it a must have to ensure the integrity and safety of concrete structures.

Concrete Test Rebound Hammer, Type N:

• Accurate, economic and reliable

• Easy to use for fast and reliable strength testing

• Aluminum housing

• Meets ASTM C805 and other standards

• Consistent hammer mass for precise impact energy

Included Items:

• Concrete Test Hammer

• Carrying case

• Carborundum stone

• Impact energy charts

Concrete Test Rebound Hammer, Type N Technical Data, Specifications, Compressive Strength:

• Measuring range: 10 to 70 N/mm² compressive strength

• Impact energy: 2.207 Nm, 1450 - 10,152psi (10-70mPa). Different concrete test hammers produce different impact energies which is important to test concrete strength.

• Dimensions: 280 x 80 mm (length x diameter)

• Weight: 1.5 kg

• Calibration: traceable to NIST. Correlation curves are used to estimate in-place concrete strength by establishing a relationship between rebound values and compressive strength.

These concrete testing hammers comes with everything you need to calibrate the hammers. Includes plastic carrying case, charts, instructions and carborundum stone for surface preparation.

Schmidt Type N Concrete Hammer Test Methods and Surface Preparation

The Concrete Test Hammer uses a spring loaded mechanism to deliver a consistent and reproducible impact force to the concrete surface. This force creates a rebound effect which is then measured by the instrument to determine the compressive strength of the concrete. With a measuring range of 10 to 70 N/mm² this hammer can test most concrete structures. It is important to ensure the test surface is well prepared, considering the moisture content and surface texture to get reliable readings.

The hammer itself is compact and light, 280mm long and 80mm diameter, easy to carry and use in the field. Weighs only 1.5 kg, perfect for extended use.

The Concrete Test Hammer is calibrated to give accurate and reliable results, calibrated to NIST. So you can trust the results of your test every time.

Overall the Concrete Test Hammer is a must have tool for anyone working with concrete structures. With its reliable and accurate measurements, compact design and NIST calibration you can be sure you get the best results every time.

• ASTM C 805

• BS 1881-202

View our full range of concrete test hammers

Calibration and Maintenance

To ensure the accuracy and reliability of the rebound hammer regular calibration and maintenance is required. Calibration should be done using a grinding stone to maintain the hammer surface hardness. Proper surface preparation of the test area is also important to get accurate results. The hammer should be stored in dry place, away from extreme temperature and humidity to prevent damage. By following these maintenance practices you can be sure your rebound hammer will give you consistent and precise readings and the quality of your concrete testing.

Applications and Limitations

The concrete test rebound hammer has:

• Estimating concrete compressive strength

• Evaluating concrete in existing structures

• Monitoring environmental effects on concrete strength

• Testing in confined spaces

But also has limitations:

• Rebound value can be affected by concrete type, surface finish and testing technique.

• Not suitable for testing high moisture content concrete or in high temperature areas.

• Not suitable for high strength concrete or high reinforcement areas.

In general the concrete test rebound hammer is a useful tool for concrete testing but use in conjunction with other testing methods. And shipping cost are minimal compared to other concrete strength testing options.