Rebound Hammer Test

Posted in Civil Engineering Tests | Email This Post Email This Post |
Print Friendly

REBOUND HAMMER

Rebound hammer test is done to find out the compressive strength of concrete by using rebound hammer as per IS: 13311 (Part 2) – 1992. The underlying principle of the rebound hammer test is

The rebound of an elastic mass depends on the hardness of the surface against which its mass strikes. When the plunger of the rebound hammer is pressed against the surface of the concrete, the pring-controlled mass rebounds and the extent of such a rebound depends upon the surface hardness of the concrete. The surface hardness and therefore the rebound is taken to be related to the compressive strength of the concrete. The rebound value is read from a graduated scale and is designated as the rebound number or rebound index. The compressive strength can be read directly from the graph provided on the body of the hammer.

Procedure to determine strength of hardened concrete by rebound hammer.


i) 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.

ii) 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.

iii) 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 15 readings.

rebound-hammer-non-destructive-concrete-test

Interpretation of Results
The rebound reading on the indicator scale has been calibrated by the manufacturer of the rebound hammer for horizontal impact, that is, on a vertical surface, to indicate the compressive strength. When used in any other position, appropriate correction as given by the manufacturer is to be taken into account.

You can have the complete details of Non destructive Test by rebound hammer test here

More Entries :
Comments
  • spike July 24, 2010 at 12:21 pm

    Dear Sir,
    Please send the procedure on how to calculate the rebound hammer result obtained at site to get the concrete strength result, calculation procedures with example, and BS specifications on various concrete strength.
    Thanks for your help.

  • jena July 28, 2010 at 6:45 am

    Dear Sir,
    Please send the procedure on how to calculate the rebound hammer result obtained at site to get the concrete strength result, calculation procedures with example, and BS specifications on various concrete strength.
    Thanks for your help

  • arif August 3, 2010 at 3:56 am

    Dear Sir,
    i want to ask,
    is the result with hammer test is ‘same’ with the result with crushing machine(Universal testing machine)?

    i have done my research with hammer test but the result is less 10-15% than crushing machine.

    my test using cube 15 x 15 x 15 cm, and 144 cube ive been compare with utm (crushing machine).

    thanks a lot b4
    regards
    arif

  • Wubete August 16, 2010 at 12:22 pm

    Dear sir/madam,
    Please send the procedure on how to calculate the rebound hammer result obtained at site to get the 28 days concrete Compressive strength result, calculation procedures with example, and BS specifications on various concrete strength.
    Thanks for your help

  • Dumindu Warapitiya, B.Sc.Eng.(Hons), AMIE(SL) August 17, 2010 at 4:16 am

    Dear Sir/Madam,

    Pls. let me know the possible tolerrance of a particular reading, obtained using Rebound Hammer. (for eg. if the strength of a concrete is read as 38 N/mm2, using the rebound hammer, what will be the range it might vary, when a core sample of same concrete, is crushed in a Compressive Strength testing machine ? )

  • Yogesh Rajpal August 19, 2010 at 7:29 am

    Please send the procedure on how to calculate the rebound hammer result obtained at site to get the concrete strength result

  • Varghese Tharakan September 2, 2010 at 2:33 am

    Dear Sir,

    Please send us the Test Procedure for Concrete Hammer Test, We, Hyundai Engineering and Construction Co. Ltd., are the one of Civil and Electrical Contractor in Libya and we want to test some concrete pile tower foundations through this test hammer.

    Thanks and Regards
    Varghese Tharakan

  • hanish m September 16, 2010 at 5:14 am

    pleas send detaild procedure on rebound hammer test

  • nandini October 8, 2010 at 4:49 am

    sir, pl tell the cost of rebound hammer testing machine and where it is available in chennai, Tamil nadu .

  • H.C.SHUKLA October 18, 2010 at 4:40 am

    kindly tell me that compressive sterenth of concrete which is tested by cube testing machine is 100% equal to rebound hammer tast means results shall be same ?

  • pardeep March 19, 2011 at 8:02 am

    Dear Sir,
    Please send the procedure on how to calculate the rebound hammer result obtained at site to get the concrete strength result, calculation procedures with example, and BS specifications on various concrete strength.
    Thanks for your help.

  • Neil March 22, 2011 at 6:01 pm

    Please could you explain to me how the rebound hammer test calculates the compressive strength of concrete?

    Is this the most accurate non destructive test for measuring the compressive strength of concrete?

    Thanks

  • SAMEER, Pune April 23, 2011 at 10:29 am

    Please send the procedure on how to calculate the rebound hammer result obtained at site to get the concrete strength result, calculation procedures with example, and BS specifications on various concrete strength.
    Thanks for your help.

    Reply

  • NANCY April 30, 2011 at 1:53 am

    pls send the procedure of using the rebound hammer test. thank you.

  • subra May 28, 2011 at 2:27 am

    Sir,pls send the procedure of using the rebound hammer test results obtained atsite to get the concrete strength

  • Er.suresh Prasad Yadav July 3, 2011 at 10:47 pm

    Sir,
    pls send the procedure of using the rebound hammer test results obtained atsite to get the concrete strength.

  • farish July 8, 2011 at 12:31 am

    Dear Sir,
    Please send the procedure on how to calculate the rebound hammer result obtained at site to get the concrete strength result.

  • shantaram sitaram kurhade July 14, 2011 at 2:28 am

    Dear Sir,
    Pl. send the procedure of how to calculate the rebound hammer result at site to get concrete strength result.

  • miss syira July 17, 2011 at 8:09 pm

    Please send the procedure on how to calculate the rebound hammer result obtained at site to get the concrete strength result.

  • Haamid August 19, 2011 at 9:55 am

    Dear Sir,
    Pl. send the procedure of how to calculate the rebound hammer result at site to get concrete strength result.

  • Post a comment

1 2 3 4 5

Share Information

What is Civil Engineering

Journals Books And Softwares

Branches Of Civil Engineering

Civil Engineering Jobs

Follow Us On FB

Knowledge Center

Civil Engineering Universities/Events

Gallery - Civil Engineering Pictures

Civil Engineering Forum

civil engineering forum

Search


engineeringcivil.com awarded best online publication by CIDC 2013

Top Contributors

Yahoo Group - Civil Engineering Portal

Subscribe to EngineeringCivil.com


Powered by groups.yahoo.com

Recently Added

Civil Engineering Links

anglo.com

Follow Us On FB