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Rebound Hammer test is a Non-destructive testing method of concrete which provide a convenient and rapid indication of the compressive strength of the concrete. The rebound hammer is also called as Schmidt hammer that consist of a spring controlled mass that slides on a plunger within a tubular housing.
- Its Types and Materials
Injection grouting is a process of filling the cracks, voids...
- Its Types and Materials
Objective: The rebound hammer method could be used for: assessing the likely compressive strength of concrete with the help of suitable corelations between rebound index and compressive strength, assessing the uniformity of concrete, assessing the quality of the concrete in relation to standard requirements, and.
Limitations and Correction Factor of Rebound Hammer Test Type of Cement – If high alumina cement was used in concrete, it gives 100% higher compressive strength compared to OPC. Simultaneously, if super sulphated cement was used in concrete, it provides a 50% lower value than the OPC in the test.
How does it work? ASTM C805, “Standard Test Method for Rebound Number of Hardened Concrete”, summarizes the procedure as “A steel hammer impacts, with a predetermined amount of energy, a steel plunger in contact with a surface of concrete, and the distance that the hammer rebounds is measured.”
estimate the compressive strength of concrete is the rebound hammer test, also known as Schmidt Hammer test. In spite of a large number of scientific works trying to calibrate the test, to identify the parameters affecting its results and to estimate its reliability, the original Schmidt curve is still provided by
Using correlation curves developed by the operator, Q-values are effective on ultra-high performance concrete (UHPC) with compressive strengths up to 17,405psi (120MPa). Rebound hammers for geological and geotechnical applications test the strength and consistency of rock formations.
The first digital rebound hammer in the world with data storage, correcting the angle of impact and direct display of the compressive strength. Also corrects the carbonation ratio.
