Procedure for rebound hammer test on concrete structure starts with calibration of the rebound hammer.
Rebound hammer test on concrete pdf.
For taking a measurement the rebound hammer should be held at right angles to them surface of the concrete member.
For this the rebound hammer is tested against the test anvil made of steel having brinell hardness number of about 5000 n mm2.
Impact energy for rebound hammer for different applications.
The force of rebound which is a measure of surface hardness is measured on a graduated scale.
Bureau of indian standard did not published any standard for this test upto 1991.
In 1992 they published is.
In the procedure of rebound hammer test the plunger of rebound hammer is pressed on the surface of concrete so that a spring controlled mass with a constant energy is made to hit the concrete surface.
The rebound hammer developed by schmidt provides an inexpensive and quick method for nondestructive testing of concrete.
456 2000 specified the non destructive tests are used to obtain estimation of the properties of concrete in the structure the methods adopted include rebound hammer.
Rebound hammer test procedure.
Reference is 13311 part 2 1992 reaffirmed may 2013 non destructive testing of concrete methods of test rebound hammer.
Schematic of rebound hammer 3.
Procedure for rebound hammer test.
The test can thus be conducted horizontally on vertical surfaces or vertically upwards or downwards on horizontal surfaces if the situation demands the rebound hammer can be.
The operation of the rebound hammer test is shown in the figure below.
13311 part 2 for this test.
In addition influence of test conditions and some general guidance on the interpretation of test results are also given.
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Rebound hammer is 13311 part 2.
Concrete methodsoftest part 2 rebound hammer 1 scope this standard covers the object principle apparatus and procedure of rebound hammer test method.
Moreover the best part of rebound hammer test is concrete can be tested in real time at the site instead of going to the lab without any damage.
At the same time a spring controlled mass rebounds back.