Pre-tensioned prestressed concrete differs from post-tensioned in that:
Choose the correct answer
Pre-tensioning uses higher steel grades
In pre-tensioning, tendons are stressed before casting; in post-tensioning, after concrete hardens
Post-tensioning cannot be used in bridges
Pre-tensioning requires more steel
Correct Answer
B. In pre-tensioning, tendons are stressed before casting; in post-tensioning, after concrete hardens
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Pre-tensioning: tendons tensioned BEFORE concrete is cast; after concrete hardens and tendons released, prestress transfers by bond. Post-tensioning: tendons placed in ducts, concrete cast and cured, THEN tendons tensioned and anchored by wedges/nuts. Pre-tensioning suits factory-made units (beams, slabs); post-tensioning suits large in-situ structures (bridges, tanks).
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