Humboldt Concrete Rebound Hammer H-2987H

Humboldt's Concrete Rebound Hammer provides a reliable, yet economical, alternative to the Original Schmidt Hammer. It is designed for testing concrete 4" (100mm) or more in thickness with a maximum particle size less than or equal to 1.25" (32mm), providing a quick and simple test for obtaining an immediate indication of concrete strength in various parts of a structure. The Humboldt Rebound Hammer covers a compressive strength range of 1,450 to 9,000 psi (10 to 62 MPa). To operate, the rebound hammer is pressed against the concrete structure and the rebound values are displayed on a mechanical sliding scale. These values can then be correlated to compressive strength by using the conver¬sion table chart affixed to the hammer. It includes a grinding stone; a cloth, carrying case; instruction booklet and conversion charts.
Concrete Test Hammers are used extensively as a fast and inexpensive nondestructive test method for determining strength of in-place concrete. Hammer tests can be used as a reliable QC test to determine strength, as well as locations for taking test core samples. They can also be used to locate damage from freezing or fire.
To operate, the plunger rod is pressed against a concrete surface until a spring-loaded mass is released, causing the mass to impact the concrete. The rebound of the mass is registered on the hammer scale and referred to as the "rebound number". Calibration curves then provide a quick conversion to indicate the strength of the concrete. Accuracy can be greatly increased when the user corre¬lates the rebound hammer readings with actual compres¬sion tests involving breaking cylinders of the same concrete mix.

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