Rebound Hammer Test
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Rebound Hammer Test is used to estimate strength and hardness of the concrete in the cover region (IS: 13311 Part II)
It is used for Surface Hardness Test
Rebound of elastic mass depends on hardness of surface
Relation between rebound number and strength of surface
Components of Hammer
Limitations
Smoothness of surface under test
Size, shape and rigidity of specimen
Age of specimen
Surface and internal moisture condition of concrete
Tyoe of coarse aggregate
Type of cement
Type of mould
Carbonation of concrete surface
Procedure
Interpretation of Test Results
Average Rebound Number
Quality of Concrete
More than 40
Very good, hard layer
30-40
Good Layer
20-30
Fair
Less than 20
Poor concrete
0
Delaminated