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Reinforcement practice questions

26 questions from the concrete and masonry practice test.

Reinforcement practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

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Sample questions

What is the nominal diameter of a No. 6 reinforcing bar?

  1. 3/8 in.
  2. 3/4 in.
  3. 5/8 in.
  4. 6/10 in.
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B. 3/4 in.

Six eighths of an inch is 3/4 in. The number is eighths, not sixteenths or tenths, which is where 3/8 in. and 6/10 in. come from.

Reference: ASTM A615, bar designations

In a simply supported beam carrying a downward load, where is the main tension reinforcement placed?

  1. Near the top of the beam
  2. At mid-depth of the beam
  3. Near the bottom of the beam
  4. Only at the two ends
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C. Near the bottom of the beam

A simple span sags, stretching the bottom, so the main bars go near the bottom. Top steel is the main tension steel in cantilevers and over interior supports.

Reference: Reinforced concrete fundamentals: flexure

Where is the main tension reinforcement placed in a cantilevered balcony slab?

  1. Near the bottom of the slab
  2. At mid-depth of the slab
  3. Near the top of the slab
  4. Only along the free edge
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C. Near the top of the slab

A cantilever bends downward at its free end, which stretches the top surface, so the main steel goes near the top. Putting it at the bottom, as in a simple span, is a classic failure.

Reference: Reinforced concrete fundamentals: flexure

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