Technical Questions

ACI Committees, Membership, and Staff have answered common questions on a variety of concrete related topics.

What are rebound, penetration resistance, and pullout tests?

Q. What are rebound, penetration resistance, and pullout 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).


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

Topics in Concrete: Nondestructive Testing; Testing of Concrete

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