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Concrete Strength Prediction SOP

The document provides a procedure for determining the predicted compressive strength of concrete using a rebound hammer. The procedure involves checking the calibration of the rebound hammer on an anvil reference surface. Testing is then conducted on dry, prepared concrete surfaces by taking 10 rebound hammer readings within a 150x150mm marked area. The average rebound number is calculated after removing outliers and used to predict compressive strength by correlating it with a standard calibration graph or software.

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Raviraj Thorat
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560 views1 page

Concrete Strength Prediction SOP

The document provides a procedure for determining the predicted compressive strength of concrete using a rebound hammer. The procedure involves checking the calibration of the rebound hammer on an anvil reference surface. Testing is then conducted on dry, prepared concrete surfaces by taking 10 rebound hammer readings within a 150x150mm marked area. The average rebound number is calculated after removing outliers and used to predict compressive strength by correlating it with a standard calibration graph or software.

Uploaded by

Raviraj Thorat
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Prediction of Compressive Strength of concrete by using Rebound hammer

Aim: To determine predicted compressive strength of concrete specimen by using rebound


hammer.
Apparatus: Rebound Hammer, Oil Pastel /Chalks (for marking)
Material: Concrete Specimen
Reference: IS 13311 Part 2: 1992 (RA-2013)

Procedure:

 Checking of the apparatus:


1. To calibrate Rebound Hammer take 10 readings of rebound hammer on guided
area of Anvil.
2. Compare average of rebound number to standard requirement given by
manufacturer of Anvil (i.e. for N-Type Rebound Hammer; average rebound
number should be 81 ± 2 )
3. If observed average rebound number found within above mentioned criteria, then
check out the instrument for respective site execution.
4. If observed average rebound hammer found outlying of above criteria, then
proceed the instrument for maintenance.
 On-site Testing:
1. Identify the point of testing with confirmation of client’s representative.
2. Prefer molded surface for testing (i.e. sides of column/wall, or bottom of slab).
3. Ensure that concrete surface is dry. Deny for testing if the surface wet since the
wet surface gives underestimation of strength.
4. Prepare the surface of concrete for testing by chipping of plaster or any other
material adhered to concrete.
5. Mark the area of 150 X 150 mm.
6. Hold the rebound hammer at right angles to the surface of concrete member in
between marked area.
7. Press the hammer against surface of structure till the plunger is release.
8. Lock the rider by pressing lock button at bottom of hammer & record the
reading.
9. Note down the angle of equipment in the records. (i.e. for vertical faces of
column, beam & wall the angle should be 0°, for bottom of slab/Beam the
angle should be +90° & for top of slab beam the angle should be -90°)
10. Take 10 readings per test location.
(Note. The point of impact of hammer should not be less than 20 mm from
edge or previously tested location.)
 Calculation:
1. Average the rebound number after deleting outlier as per IS 8900: 1978.
2. Determine the predicted compressive strength of concrete by correlating the
average rebound number with the standard calibration graph or enter the readings
in software for strength calculation.

Durocrete Engineering Services Pvt. Ltd. Pune


Doc. No. DUROqd3/10 Doc: Standard Operating Procedure Issue No : 1 Date: 01/11/2012
Amendment No: Nil Amendment Date: Page No.
Approved By: TM Issued By: Q.M.

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