Testing Service

REBOUND HAMMER

Rebound hammer test is done to find out the compressive strength of concrete by using rebound hammer as per IS: 13311 (Part 2) - 1992. The underlying principle of the rebound hammer test is :

The rebound of an elastic mass depends on the hardness of the surface against which its mass strikes. When the plunger of the rebound hammer is pressed against the surface of the concrete, the Spring-controlled mass rebounds and the extent of such a rebound depends upon the surface hardness of the concrete. The surface hardness and therefore the rebound is taken to be related to the compressive strength of the concrete. The rebound value is read from a graduated scale and is designated as the rebound number or rebound index. The compressive strength can be read directly from the graph provided on the body of the hammer.

laboratory and NDT equipments

laboratory and NDT equipments

SGM lab solutions was established with an aim to serve a wide variety of laboratory and NDT equipments. We believe in serving products of quality. we offer a complete range of Rebound hammer and RCPT including its testing & calibration service. We provided accuracy and assurance for significant experiments.
We constantly work harder to improve the over all quality within the industry. We are constantly bringing together the best technical expertise to provide viable and cost-effective solution to laboratories, while answering the need for affordable, outstanding and exceptional after sales services and support thus enabling our customer to attain the highest value for their purchases. We strive to advance people's knowledge and there ability to enhance their quality of life. Trust in a strong brand that stands for quality and innovation in the lab for decades.

originally found here:- http://reboundhammer.com/about-us.html

INTERPRETATION OF RESULTS OF REBOUND HAMMER

INTERPRETATION OF RESULTS OF REBOUND HAMMER

The rebound reading on the indicator scale has been calibrated by the manufacturer of the rebound hammer for horizontal impact, that is, on a vertical surface, to indicate the compression strength. When used in any other position, appropriate correction as given by the manufacturer is to be taken into account. 

Hammer test can provide fairly accurate estimate of concrete compression strength, it performed with precautions and co- relations:

1.     Concrete Age: The concrete should be 14 to 56 days old.

2.     Surface Condition: The surface of the concrete at the point tested must be smooth dry and free of honey combing. Otherwise, rebound readings will be low indicating a weaker concrete than is actually the case .

3.     Location of Test Point: The concrete to be tested must be at least 100 mm thick. Care must be taken that the test points are no closer than 25 mm from the edge.

No. of Readings: Calculate the average of 10 readings and exclude extreme readings (if any) and recalculate average using the remaining readings

originally found here:- http://www.reboundhammer.com/testing.html

STRENGTH OF HARDENED CONCRETE BY REBOUND HAMMER

PROCEDURE TO DETERMINE STRENGTH OF HARDENED CONCRETE BY REBOUND HAMMER:

·         

       Before commencement of a test, the rebound hammer should be tested against the test anvil, to get reliable results, for which the manufacturer of the rebound hammer indicates the range of readings on the anvil suitable for different types of rebound hammer.

·         Apply light pressure on the plunger - it will release it from the locked position and allow it to extend to the ready position for the test.

·         Press the plunger against the surface of the concrete, keeping the instrument perpendicular to the test surface. Apply a gradual increase in pressure until the hammer impacts. (Do not touch the button while depressing the plunger. Press the button after impact, in case it is not convenient to note the rebound reading in that position.)iv) Take the average of about 5 readings.

         originally found here:- http://www.reboundhammer.com/testing.html

Rebound Hammer Test

Rebound Hammer Test

Rebound hammer test is done to find out the compressive strength of concrete by using rebound hammer as per IS: 13311 (Part 2) - 1992. The underlying principle of the rebound hammer test is : 
The rebound of an elastic mass depends on the hardness of the surface against which its mass strikes. When the plunger of the rebound hammer is pressed against the surface of the concrete, the Spring-controlled mass rebounds and the extent of such a rebound depends upon the surface hardness of the concrete. The surface hardness and therefore the rebound is taken to be related to the compressive strength of the concrete. The rebound value is read from a graduated scale and is designated as the rebound number or rebound index. The compressive strength can be read directly from the graph provided on the body of the hammer. 

originally found here:- http://www.reboundhammer.com/testing.html