Reinforced Concrete Design: Why Cracks Are Part of the Plan
How concrete and steel team up in beams, slabs, columns and prestressed spans, and why a good design fails slowly and visibly.
Reinforced Concrete Design · 50 questions
Try 3 questions
1. Roughly how does concrete's tensile strength compare with its compressive strength?
- About one tenth as much
- Roughly half as much
- About the same amount
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Answer: About one tenth as much
Concrete cracks under modest tension, around 10% of its crushing strength, so steel is added to carry tension.
2. Besides bonding well, what physical property lets steel and concrete work together through hot and cold seasons?
- They expand with heat alike
- They have equal stiffness
- They have equal density
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Answer: They expand with heat alike
Their thermal expansion coefficients are very close, so temperature changes don't tear the bond between them.
3. Concrete hardens mainly because of what process?
- The water slowly drying out
- Cement reacting with water
- Air bubbles escaping the mix
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Answer: Cement reacting with water
Hydration binds water into new crystals; concrete can even harden underwater, and drying out too early stops the reaction.
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