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IS 516:1969

The Indian Standard Code IS 516:1969 provides methods of tests for the strength of concrete. Here are key questions and one-liner answers covering essential aspects of IS 516:1969 in the field of civil engineering.

General Overview

1. What is IS 516:1969?

• IS 516:1969 is the Indian Standard Code for methods of tests for strength of concrete.

1. What is the primary purpose of IS 516:1969?

• To specify the methods for testing the compressive, flexural, and tensile strength of concrete.

Compressive Strength

3. What is the standard size of a concrete cube for compressive strength testing?

• 150 mm x 150 mm x 150 mm.

3. How should the concrete cubes be prepared for compressive strength testing?

• Cast in steel or cast iron molds, compacted properly, and cured in water at 27±2°C.

3. When should the compressive strength test be conducted?

• Typically at 7 days and 28 days after casting.

3. What is the loading rate for compressive strength testing?

• 140 kg/cm² per minute.

Flexural Strength

7. What size of concrete beam is used for flexural strength testing?

• 150 mm x 150 mm x 700 mm or 100 mm x 100 mm x 500 mm.

7. How is flexural strength of concrete tested?

• By applying a load at the third points of the beam span until failure.

7. What is the standard span length for a beam in flexural strength testing?

• Three times the depth of the beam (450 mm for a 150 mm deep beam).

7. What is the loading rate for flexural strength testing?
   • 1.8 kN/min for the 150 mm specimen and 0.4 kN/min for the 100 mm specimen.

Tensile Strength

11. What method is used for testing the tensile strength of concrete?
    • The splitting tensile test.
12. What is the specimen size for the splitting tensile test?
    • Cylinders of 150 mm diameter and 300 mm length.
13. How is the splitting tensile test performed?
    • By placing the cylinder horizontally between the loading surfaces of a testing machine and applying a compressive load along the vertical diameter.
14. What is the loading rate for the splitting tensile test?
    • 1.2 to 2.4 MPa/min.

Preparation and Curing

15. How should molds be prepared before casting concrete for tests?
    • Cleaned, oiled, and assembled tightly to prevent leakage.
16. What is the standard curing temperature for concrete specimens?
    • 27±2°C.
17. For how long should the specimens be cured before testing?
    • Typically 7 days, 28 days, or as specified.

Testing Machine

18. What type of testing machine is used for compressive and tensile tests?
    • A hydraulic compression testing machine.
19. What are the accuracy requirements for the testing machine?
    • The machine should be capable of applying loads uniformly and accurately as per the specified rates.

Interpretation of Results

20. How is the compressive strength calculated?
    • By dividing the maximum load applied by the area of the specimen.
21. What does a compressive strength test result indicate?
    • The ability of concrete to withstand axial loads.
22. How is flexural strength expressed?
    • As the modulus of rupture, which is calculated based on the maximum load and dimensions of the beam.
23. What does the tensile strength test determine?
    • The resistance of concrete to axial tensile stress.

Miscellaneous

24. Why are standard testing methods important?
    • They ensure consistent and reliable results, allowing for quality control and comparison.
25. What safety precautions should be taken during testing?
    • Proper handling of specimens, ensuring the testing machine is calibrated, and following safe loading procedures.

These questions and answers provide a concise overview of IS 516:1969, highlighting its critical aspects in testing the strength of concrete in civil engineering.

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