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Manual Concrete Test Hammers are the traditional instruments used for the non-destructive testing of hardened concrete. James NDT W-M-250 Manual Rebound Concrete Hammers are easy-to-use instruments that provide 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; which is correlated to concrete compressive strength.
The manual concrete test hammer, also known as a Rebound Hammer, Schmidt Hammer, Swiss Hammer, or 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 IV.
All James Concrete Test Hammers conform to ASTM C-805*, BS-1881 #202 and other international standards.
* Standard Test Method for Rebound Number of Hardened Concrete
Features of the James Manual Concrete Test Hammer
- Easy-to-use manual calculation of the mean rebound number.
- Impact Energy level of 1.6 ft. lbs. (0.225 kgm / 2.2 Nm) and come complete with carrying case and carborundum stone.
- The minimum verifiable strength is 1400 PSI (10 MPa)
It is recommended that calibration of the test hammers be checked regularly – usually after about 2000 strokes.
The James Calibration Anvil (W-C-7312) has been designed
for just that purpose.
W-C 7312 Test Anvil