REBOUND HAMMER TEST ON CONCRETE

•       Rebound hammer is a handy tool, which can be used to provide a convenient and rapid indication of the compressive strength of concrete.

 •     Rebound hammer test gives relationship between compressive strength of concrete and rebound  number.

parts of rebound hammer

 

•        Specimen is tested against the test anvil of rebound hammer.

•     A light pressure applied on the plunger and allowed to extend to the ready position for the test.

•     Gradual increase in pressure is applied on hammer until it strikes the specimen.

•       Rebound hammer generates a number after strike, called rebound number or rebound index.

• Average of at least 15 rebound number observations are taken observations are taken.

 

Rebound hammer positioning

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• Average Rebound Number	Quality of Concrete
  >40	Very good hard layer
  30 to 40	Good layer
  20 to 30	Fair
  < 20	Poor concrete
  0	Delaminated