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M.Tech Structural Durability of Concrete — practice questions

Explore 2 free Durability of Concrete questions in M.Tech Structural Civil Engineering. Open each question or exercise to read its content, reference answers and available explanation.

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Durability of Concrete questions and exercises with answers

Showing questions 1–2 of 2.

Per §8.4.3, concrete typically shows little loss of strength up to approximately what temperature?Read the answer and worked solution →Per §8.5.2, freezing of water in HARDENED concrete is estimated to exert internal pressure of approximately:Read the answer and worked solution →

Worked practice questions

Per §8.4.3, concrete typically shows little loss of strength up to approximately what temperature?

  1. About 300 °C
  2. About 150 °C
  3. About 50 °C
  4. About 800 °C
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Correct answer: A. About 300 °C

1. §8.4.3 reads: 'Concrete does not show appreciable loss of strength upto a temperature of 300°C, but the loss of strength may be 50 per cent or more at about 500°C.' 2. Best fire-resistant aggregates listed are basalts, dolerites, dense limestone, blast furnace slag and broken brick aggregate. _Source: IGNOU ET-522 Block-2 Unit-8 Durability of Concrete, §8.4.3, p. 73_

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Per §8.5.2, freezing of water in HARDENED concrete is estimated to exert internal pressure of approximately:

  1. About 10 kg/cm²
  2. About 40 kg/cm²
  3. About 140 kg/cm²
  4. About 1000 kg/cm²
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Correct answer: C. About 140 kg/cm²

1. §8.5.2: 'It has been estimated that freezing of water in hardened concrete could exert pressures of about 140 Kg per sq cm and if strength of concrete is less than this it could get damaged severely.' 2. Damage accumulates with freeze-thaw cycles, especially in members wet on more than one face. _Source: IGNOU ET-522 Block-2 Unit-8 Durability of Concrete, §8.5.2, p. 74_

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