MODULUS OF ELASTICITY FOR ROCK / CONCRETE

Based on IS:9221-1979 (Reaffirmed 2021) – “Method for Determination of Modulus of Elasticity and Poisson’s Ratio of Rock Materials in Uniaxial Compression” and ASTM D7012

Purpose:

To determine the Modulus of Elasticity (E) and Poisson’s Ratio (ν) of rock materials under uniaxial compressive load, using axial and lateral strain measurements.

Test Type:

Static uniaxial compression test within elastic limit of the rock specimen.

Features of the Set up

1. Automatic Test Execution :
2. Once the machine has been switched on, the specimen positioned and centered, the only required operations are
3. Set test parameters ‑ including load rate
4. Press the start button
5. Tighten the pressure valve
6. The machine automatically: starts the rapid approach; switches to the test speed once the specimen comes into contact with the upper platen; automatically stops the motor upon specimen failure
7. Release the pressure valve
8. The test execution conforming to Standards can be easily proved.
9. Working on 240V, 50‑60Hz, single phase.
10. Dual stage pump assuring fast piston approach and precise test execution
11. Test execution conforming to IS:9221-1979
12. Controllable pace rate from 1 KN/Sec to 10 KN/Sec.
13. Auto stop after completion of each test.
14. Soft platen‑to‑specimen contact and smooth load rate control from the very beginning of the ramp
15. Supplied complete with a displacement sensor
16. Displacement range : 0.01 mm to 15 mm
17. Least count : 0.01 mm
18. Accuracy : 1%
19. Graph can be stored in computer and printed from the computer
20. Direct report can be generated from the computer
21. Software can be connected to any computer with I3 or above processor and operating system windows 10. Min 4 GB ram and 500 GB hard disk required. 
22. Displacement sensor can be adjusted as per the size of the sample.
23. Rock sample has to be surface grinded, capped and levelled

Frame

1. Four column high stiffness welded frame tested for stability.
2. Heavy duty spherical seat , allowing initial free alignment at the initial contact with the specimen and automatic jamming up to the end of test.
3. Surface hardness of platen is 55 HRC, flatness tolerance 0.03 mm. Traceable certificate of surface hardness available on request.
4. Piston travel limit switch
5. Emergency stop button

Salient feattures of data manager PC software

1. Multi-channel input for strain and load data
2. Real-time data capture and graph plotting
3. Two way communication i.e machine operates from computer and from the touch screen controller both (Start, stop, save data and save graph)
4. Results directly saved in excel file
5. Graph also saved in excel file
6. Capable to save customer name, other details of customer, ageing of test specimen, identification mark of the test specimen, date and time of testing
7. Capable to print direct report from the computer
8. Capable to select different test parameters like pace rate, sample size and area from the computer (software)
9. Stress Vs. strain graph
10. Direct determination of the poisson's ratio in software

REPORT CONTENTS

1. Rock type and source
2. Specimen dimensions
3. Axial and lateral strain readings
4. Graphs: Stress vs Axial strain, Stress vs Lateral strain
5. Modulus of Elasticity (E)
6. Poisson’s Ratio (ν)
7. Test date and operator

Ancillaries required for the test

1. Capping material (e.g. sulphur compound)
2. Capping set
3. Calipers/micrometers for dimension measurement