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EEJ MAIN Aptitude QUESTION #10969
Question 1
Which of the following statements about reinforced cement concrete (RCC) is correct?
  • Steel and concrete have very different thermal expansion coefficients, causing internal stress
  • Concrete carries tension and steel carries compression in RCC
  • Steel and concrete have approximately the same coefficient of thermal expansion✔️
  • Steel has lower compressive strength than concrete
Correct Answer Explanation

The key reason RCC works so well:

  • The coefficient of thermal expansion of steel ≈ \(12 \times 10^{-6}/°C\
  • The coefficient of thermal expansion of concrete ≈ \(10-14 \times 10^{-6}/°C\
  • These are approximately equal, so both expand and contract together — no internal thermal stresses develop at the bond interface. ✓

Also: In RCC, concrete carries compression and steel carries tension (opposite of option B). Steel has much higher compressive strength than concrete (option D is wrong).