How do you calibrate a rebound hammer?

The cap has an adjustment screw and nut, which are used to calibrate the Rebound Hammer. 2. Using a 10 mm wrench, loosen the adjustment nut away from the cap. If the Rebound Hammer is reading low, tighten the adjustment screw (clockwise) into the cap.

How do you calculate rebound hammer results?

4) If the rebound hammer is held at an intermediate angle, the rebound number (rebound index) will give differentiated results for the same surface and concrete….Rebound Hammer Test Procedure.

Sr. No.	Applications	Approximate Impact Energy for Rebound Hammer in Nm
3.	For mass concrete testing E.g. in roads, hydraulic structures, and pavements	30.00

What is meant by calibration of rebound hammer?

Calibration and Reliability of the Rebound (Schmidt) Hammer Test. The typical procedure for calibrating a test is that of producing specific specimens with different strength but with the same concrete type (aggregate size and type), as in the previous section.

IS 516 for rebound hammer test?

Civil Tech has Digital and Mechanical types of rebound hammer in accordance with IS 516. It can evaluate strength of the on-situ concrete. It is a quick estimate of the strength of concrete. Since it simply gives an indication based on surface properties.

Is code for rebound hammer test?

13311
Objective of Rebound Hammer Test As per the Indian code IS: 13311(2)-1992, the rebound hammer test have the following objectives: To determine the compressive strength of the concrete by relating the rebound index and the compressive strength. To assess the uniformity of the concrete.

How do you find the compressive strength of a rebound hammer?

Compressive strength (N/mm2) = Maximum crushing load / Cross – sectional area of specimen. Schmidt Rebound Hammer test is a non- destructive test.

What is the is code for rebound hammer test?

What is Q value in rebound hammer test?

The “Q”-value [=rebound V divided by inbound V] represents the physical rebound coefficient. It is virtually free of all the above error sources. It is thus the indicator of choice to be used as a basis to convert to compressive strength.

IS 516 a perfect cube?

⇒ 516 is not a perfect cube as it cannot be expressed as n × n × n form the product of three equal integer.

Is code for rebound hammer test part 2?

Basic Details

IS Number :	IS 13311 : Part 2 : 1992
IS Title [Eng-Hn] :	Method of Non-destructive Testing of Concret-methods of Test : Part 2 Rebound Hammer
No of Revision :
No of Amendments :	0
Technical Department :	Civil Engineering Department

Is code of rebound hammer test?

Objective of Rebound Hammer Test As per the Indian code IS: 13311(2)-1992, the rebound hammer test have the following objectives: To determine the compressive strength of the concrete by relating the rebound index and the compressive strength. To assess the quality of the concrete based on the standard specifications.

What is the impact energy for rebound hammer test?

Procedure for Rebound Hammer Test Sl.No Applications Approximate Impact Energy for Rebound Ha 1 For Normal Weight Concrete 2.25 2 For light weight concrete / For small an 0.75 3 For mass concrete testing Eg: In roads, 30.00

How do you read the rebound on a concrete hammer?

Thus, the hardness of concrete and rebound hammer reading can be correlated with compressive strength of concrete. The rebound value is read off along 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.

How often should I calibrate my rebound hammer?

We recommend that you calibrate your Rebound Hammer regularly using the Humboldt Calibration Anvil, H-2972, ordered separately. For a Rebound Hammer, you should start verifying the readings after approximately 2,000 uses (or completed tests).

How much data do we know about the Schmidt rebound hammer?

More than 65 years of research data with the Schmidt rebound hammer is used for evaluation. The Authors also addressed the effect of each influencing factor on the performance of the rebound hammer and suggested amendment in the B-Proceq curve.