Manual Rebound Hammer
Economical Strength Testing of Hardened Concrete
and Hardness Testing of Materials

• Purchasing Notes
• Applications
• Features & Benefits
• Downloadable Documents (PDF)
• Standards
• Product Details
• Specifications

Purchasing Notes

• Use this in conjunction with the V-C-400 V-Meter MK IV™ for rapid and accurate estimation of concrete strength.

• The equipment should be verified for proper operation with W-C-7312 TestAnvil for calibrating James Test Hammers the calibration anvil at regular intervals.

• All Test Hammers shown here have an Impact Energy level of 1.6 ft. lbs. (0.225 kg) and come complete with carrying case and carborundum stone.

Applications

• Manual hammers for the quick and easy determination of the strength of concrete.

Features and Benefits

• Easy to use manual calculation of the mean rebound number.

• All James Test Hammers conform to:
  

Downloadable Documents (PDF)

• Manual Test Hammer.pdf
  

Standards

• ASTM C805 / C805M - 13a
  Standard Test Method for Rebound Number of Hardened Concrete
• ASTM D5873 - 14
  Standard Test Method for Determination of Rock Hardness by Rebound Hammer Method
• BS1881-202:1986
  Testing concrete. Recommendations for surface hardness testing by rebound hammer
• BS EN 12504-2:2001
  Testing concrete in structures. Non-destructive testing. Determination of rebound number

Product Details

The W-M-250 Manual Test Hammer is the traditional instrument used for the non-destructive testing of hardened concrete. This easy-to-use instrument provides a quick and simple test for obtaining an immediate indication of concrete strength in various parts of a structure. The minimum verifiable strength is 1400 PSI (10 MPa) to approximately 9000 PSI (62 MPa). All concrete test hammers measure the surface hardness of the material they are testing; this is then correlated to concrete compressive strength.

The manual concrete test hammer, aka rebound hammer, schmidt hammer, swiss hammer, sclerometer, is the most widely used non destructive instrument for compressive strength determination. However, it typically has the largest coefficient of variation; therefore its result should be verified with another non destructive test such as the V-Meter MK III.

Typical Correlation Charts for James Instruments Rebound Hammer