'Pre-stressed concrete' is preferred over ordinary RC when:
Choose the correct answer
Only for short spans under heavy point loads
Long spans, crack-free requirements (liquid retaining), fatigue loading — high quality materials and skills required
Always replacing RC for all applications
When columns are taller than 3 m
Correct Answer
B. Long spans, crack-free requirements (liquid retaining), fatigue loading — high quality materials and skills required
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PSC preferred: (1) Long spans (> 10–15 m for beams, > 20 m for bridges) — less deflection, smaller cross-section; (2) When cracks must be absolutely avoided (water-retaining, nuclear structures); (3) Under fatigue loading — full section works in compression; (4) Reduces steel and concrete consumption by 25–50%. Disadvantage: higher material cost, skilled labour, specialised equipment.
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