Chapter 9 Flashcards

1
Q

Precast concrete construction

A
  • Cast in manufacturing yard and fixed in position on site
  • Normally cast in steel moulds
  • More stringent dimensional precision is required
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2
Q

Cast-in-situ

A
  • Casting and fixing at the exact position on the construction site
  • Usually cast in timber moulds
  • Less critical in dimensional precision
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3
Q

Types of movement joints

A
  • Contraction joint
  • Expansion joint
  • Sliding joint
  • Settlement joint
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4
Q

Classification of joints in precast concrete

A
  • Tension joint
  • Compression joint
  • Shear joint
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5
Q

Advantages of precast concrete

A
  • Faster construction speed
  • Dimensional deviation is small
  • Better quality control
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6
Q

Limitations of precast concrete

A
  • Tolerances must be allowed for
  • Distance between precast yard and site will affect costing of project
  • Accessibility, storage area and capacity of crane will affect erection process on site
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7
Q

Manufacturing stage

A
  • Mould fabrication
  • Casting and curing of concrete
  • Storage of precast components
  • Delivery of components
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8
Q

Erection stage

A
  • Temporary storage in site
  • Putting up the components
  • Temporary support
  • Fixing of joints
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