Limitations of Rebound hammer test:

1. Rebound of hammer may get affected due to roughness of concrete surface.

2. The age of concrete also varies with rebound number i.e. cured concrete gives more rebound no. than fresh one.

3. Surface moisture of concrete may give inaccurate rebound number.

4. Type of concrete ingredients i.e. cement, coarse aggregate may affect rebound number.

5. Size and shape of specimen also affect hammer impact.