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Rebound Hammer Testing

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REBOUND HAMMER TESTING

A Rebound Hammer test is used to perform the comprehensive strength of concrete by using a rebound hammer tester. The rebound hammer test is also called the “Schmidt hammer test.”

What is Rebound Hammer Test?

The Rebound hammer test is a non-destructive test method of the concrete used to strengthen the comprehensive concrete. This test is performed on hard concrete areas. The working process of this test contains spring-controlled mass with a slider on the plunger and tubular housing.

Uses of Rebound Hammer Test:

This test is used to determine the surface hardness measurement of the concrete regarding soundness and quality. The low measurement numbers give weak concrete surface details which might be affected by corrosion and the high rebound number proves the high concrete quality.

Objectives of Rebound Hammer Test:

  • It determines the concrete strength by relating comprehensive strength and rebound index.
  • It checks the cement base quality according to the respective standard specifications.
  • It relates various concrete elements to examine the concrete quality.
  • It carries the repairs of the RCC structure for the concrete area.
  • It detects concrete uniformity.

Rebound Hammer Test Process:

A Rebound hammer is a tool designed to test the concrete hardness in various factors. The process of rebound hammer test is as follows:

  • A spring-loaded hammer is released to the concrete hardness surface with the impact of the piston to the concrete
  • A sliding indicator records the distance resulting from the “Rebound Number” when the hammer bounces back on a linear scale.
  • The rebound number is referred to for the comprehensive strength of the concrete.

The Procedure of Rebound Hammer Test:

The rebound hammer test is conducted horizontally either vertically upward or downward on concrete surfaces. The test is performed only on dry concrete surfaces. Test on rough surface results in incomplete compaction, grout loss, tooled surfaces cannot obtain reliable results and hence for appropriate results always choose the dry, smooth, and clean surface.

The Calculation process of Rebound Hammer Tester:

  • To get appropriate readings, calculate the average of 10 readings
  • It is best to discard readings that average varies 7 or above.
  • The final outcome will be calculated with the average of the remaining readings.
  • If there are more than two readings with 7 from the average, discard all the ten readings and calculate freshly.

Though, the rebound hammer test specifies the concrete strength, the higher the average number defines the strength of the concrete. The Rebound hammer test is usually conducted on all the observation points on all the accessible structural elements.

Precautions to carry Rebound Hammer Test:

  • The concrete surface should be clean, smooth, and dry
  • Before testing, the loose surface should be rubbed off either with a stone or a grinding wheel
  • There should be at least a 20mm point of impact between the edge and concrete surface.
  • Test conducted on the rough surfaces doesn’t provide concrete compaction, spoiled surfaces, grout results, and other major measurements.