PROCEDURE
TO DETERMINE STRENGTH OF HARDENED CONCRETE BY REBOUND HAMMER:
·
Before commencement of a
test, the rebound hammer should be tested against the test anvil, to get
reliable results, for which the manufacturer of the rebound hammer indicates
the range of readings on the anvil suitable for different types of rebound hammer.
·
Apply light pressure on
the plunger - it will release it from the locked position and allow it to
extend to the ready position for the test.
·
Press the plunger
against the surface of the concrete, keeping the instrument perpendicular to
the test surface. Apply a gradual increase in pressure until the hammer
impacts. (Do not touch the button while depressing the plunger. Press the
button after impact, in case it is not convenient to note the rebound reading
in that position.)iv) Take the average of about 5 readings.
originally found here:- http://www.reboundhammer.com/testing.html