NASCLA Accredited Commercial General ContractorConcreteEasy
A pre-stressed concrete beam is being manufactured off-site. During the manufacturing process, high-strength steel tendons are tensioned before the concrete is cast around them. This method is known as:
- ASegmental stressing
- BPost-tensioning
- CExternal stressing
- DPre-tensioning
Show answer & explanationAnswer & explanation
Correct answer: D. Pre-tensioning
Pre-tensioning is a method where high-strength steel tendons are tensioned prior to casting the concrete. Once the concrete gains sufficient strength, the tension is released, transferring compressive forces to the concrete.
Why the other options are wrong
- A. Segmental stressing refers to tensioning individual segments of a structure, often used in bridge construction, not the basic method of applying initial stress.
- B. Post-tensioning involves tensioning the tendons after the concrete has hardened.
- C. External stressing involves tendons located outside the concrete section, which is a variation but not the primary method described.
Pre-tensioned Concrete
A type of pre-stressed concrete where tendons are tensioned before concrete is placed and hardened.
- Typically done in a factory setting.
- Bond between steel and concrete is essential.
- Common for beams, planks, and piles.
Memory trick: Pre-tension before, Post-tension after.