Chapter 10 Flashcards by John Tagle

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Q

Advantages of prestressing

A

Increase in durability
Full section is utilised
Increase in shear capacity

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Q

Limitations of prestressing

A

Use of high strength materials is costly
Additional cost in auxiliary equipment
Need for quality control and inspection

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Q

Describe Pre-tensioned concrete

A

Tendons stressed between abutments
Concrete cast and cured
Tendons released and prestress transferred

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Q

Pre-tensioned concrete can be

A

Lintels
Beams
Floor slabs

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Q

Describe Bonded Post-tensioned concrete

A

Concrete cast and cured
Tendons stressed and prestress transferred
Tendons anchored and subsequently grouted

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Q

Describe Unbonded Post-tensioned concrete

A

Tendon coated with grease and covered by plastic sheathing
Tension transferred through steel cable acting against steel anchors
Main disadvantage: Cable can destress itself and burst out of the slab if damaged

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