What are rebound, penetration resistance, pullout, and break-off tests?

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What are rebound, penetration resistance, pullout, and break-off tests?

Q. What are rebound, penetration resistance, pullout, and break-off tests?

 

A. A rebound test consists of striking a steel rod in contact with the concrete surface with a spring-propelled mass or hammer (ACI 228.1R, ASTM C805). The instrument measures the amount of rebound of the hammer.

In the penetration-resistance technique, one measures the depth of penetration of a rod (probe) or a pin forced into the hardened concrete by a driver unit (ACI 228.1R, ASTM C803).

The pullout test measures the maximum force required to pull an embedded metal insert with an enlarged head from a concrete specimen or structure. Inserts are either cast into the fresh concrete or post-installed into the hardened concrete (ASTM C900).

The break-off test measures the force required to break off a cylindrical core from a larger concrete mass (ASTM C1150). For new construction, the core is formed by a plastic sleeve inserted into the surface of the fresh concrete, and for hardened concrete it is formed by using a special core bit.

 

References: SP-1(02); ACI 228.1R-19; ACI 228.2R-13; ASTM C803; ASTM C805; ASTM C900; ASTM C1150

Topics in Concrete: Nondestructive Testing; Testing

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