Humboldt Concrete Rebound Hammer

Humboldt Concrete Rebound Hammer: Schmidt Hammer Conversion Table

Humboldt’s concrete rebound hammer is a reliable and economical alternative to the original schmidt hammer. It’s used to test concrete 4” (100mm) or more in thickness with a maximum particle size less than or equal to 1.25” (32mm), to get an immediate indication of concrete strength in various parts of a structure. The Humboldt rebound hammer covers a compressive strength range of 1,450 to 9,000 psi (10 to 62 MPa). To use, the rebound hammer is pressed against the concrete structure and the rebound values are displayed on a mechanical sliding scale. These values can then be correlated to compressive strength by using the conversion table chart on the hammer. The velocity of this rebound is measured to calculate the compressive strength of the concrete. Accurate calculation of the rebound number is key to reliable compressive strength estimation, for which the Humboldt HCM-4000iHP Compression Test Machine can serve as a complementary tool. It includes a grinding stone, a cloth carrying case, instruction booklet and conversion charts.

Features:

• Accurate, economical, and dependable

• Easy-to-use for fast and reliable strength assessments

• Aluminum housing

• Meets requirements of ASTM C805 and other standard test methods

• For precise and reliable material testing, explore A&D balances suitable for laboratory and industrial applications

Included Items:

• Concrete Test Hammer

• Carrying case

• Carborundum stone

• Construction Tools

• Impact energy charts

• Asphalt tools

What is a Rebound Hammer?

Rebound hammers, also known as Schmidt hammers, are must-have tools for non-destructive testing of concrete structures. These devices are used to determine the compressive strength of concrete quickly and efficiently. The rebound hammer test is a simple yet effective way to assess the quality and strength of concrete in various construction projects.

The test involves striking the concrete surface with a hammer, which then rebounds. The velocity of this rebound is measured to calculate the compressive strength of the concrete. This is crucial in civil engineering and construction, to get a rapid and accurate assessment of concrete strength without damaging the structure.

Rebound hammers have become a standard practice in the construction industry, to non-destructively test concrete. This ensures the safety and durability of buildings and other concrete structures. By using rebound hammers, engineers and contractors can verify the compressive strength of concrete, identify potential weaknesses and make informed decisions about the structural integrity of a building.

Specifications:

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

• Impact energy: 2.207 Nm, 1450 - 10,152psi (10-70mPa) - Explore reliable abrasion test machines designed for precision and durability

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

• Weight: 1.5 kg

• Calibration: NIST traceable

For testing durability and abrasion resistance, consider the Los Angeles Abrasion Test Machine.

These concrete testing hammers come with everything you need to calibrate the hammers. Includes plastic carrying case, charts, instructions and carborundum stone for surface preparation. Specifications were determined through rigorous testing and calibration to ensure accuracy and reliability.

Test Principle

The principle of the rebound hammer test is based on measuring the rebound velocity of the hammer after it strikes the surface. The rebound velocity is directly related to the hardness and compressive strength. Higher rebound values mean stronger.

The test is performed on a clean and smooth concrete surface, free from any contaminants or irregularities that could affect the results. The rebound hammer is pressed against the concrete surface and the rebound value is measured and displayed on a scale, usually in units of rebound number or compressive strength.

The rebound value is then used to estimate the compressive strength of the concrete, using a formula or chart provided by the manufacturer of the rebound hammer. The accuracy of the test results depends on various factors, including the type of concrete, the surface condition and the calibration of the rebound hammer.

Schmidt Type N Test Method

The Test Hammer uses a spring-loaded mechanism to deliver a consistent and reproducible impact force to the surface. This force creates a rebound effect which is then measured by the instrument to determine the compressive strength. With a measuring range of 10 to 70 N/mm², this test hammer can measure the strength of most concrete structures.

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

The Test Hammer is calibrated to ensure accurate and reliable results, NIST traceable calibration means you can trust the results of your tests to be accurate and consistent every time.Please use with caution, surface condition, type and curing conditions can affect the test results. Formulae for compressive strength correlations can be found in the reference materials.

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

• ASTM C 805

• BS 1881-202

• Cement Tests | Hydraulic Mortars Strength Testing

• Autoclave Expansion of Portland Cement

• Understanding ASTM C151: Essential Guide for Cement Expansion Testing

• Cement Testing

View the Cement Vibration Sensor Tachometer Type Indicators today Top Concrete Vibrator for Efficient and Smooth Construction Finishing full range of concrete testing equipment