To determine the modulus of rupture, the size of test specimen used is

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BPSC AE Paper V Civil 19 Dec 2024 Official Paper
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  1. 150 x 150 x 500 mm
  2. 150 x 150 x 200 mm
  3. 150 x 150 x 700 mm
  4. 150 x 150 × 100 mm

Answer (Detailed Solution Below)

Option 3 : 150 x 150 x 700 mm
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Detailed Solution

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Explanation:

  • The modulus of rupture is determined using a beam specimen in a flexural strength test.

  • As per IS 516:1959, the standard specimen size is 150 mm × 150 mm × 700 mm.

  • This size provides a span of 600 mm with a span-to-depth ratio of 4, which is essential for accurate results.

Additional Information

Modulus of Rupture (Flexural Strength):

  • Modulus of rupture is the maximum stress a concrete specimen can withstand in bending before failure. It reflects the tensile strength of concrete indirectly.
  • Used to evaluate the flexural tensile strength of concrete, particularly in pavement slabs, beams, and other flexure-dominated elements.

Test Standards:

  • IS 516:1959 (India)

  • ASTM C78/C78M (International)

Typical Test Setup:

  • Beam specimen: 150 mm × 150 mm × 700 mm

  • Span length: 600 mm

  • Load applied at third points (two-point loading)

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