Difference between Precast & Cast-in-situ Concrete

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Precast & cast-in-situ concrete are the product produced by casting concrete in a mould or formwork which cured to get the strength of RCC elements. The precast concrete is transported to the construction site, lifted and positioned at the predetermined place. The cast-in-situ concrete is standard concrete which is poured into the specific formwork on the site and cured to get the strength of RCC elements.

Here are the differences between the precast & cast-in-situ-concrete:

Also Read:

Difference between Flat Slab & Conventional Slab

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0202030025-01-Precast-Cast-in-situ-Concrete

PRECAST CONCRETE

CAST-IN-SITU-CONCRETE

  • Elements are manufactured in a controlled casting environment and have it is easier to control mix, placement and curing.
  • Column, slab etc. elements are cast on site and hence it is difficult to control mix, placement and curing in cast-in-situ concrete.
  • Quality can be controlled and maintained easily.
  • Quality control and maintenance are difficult.
  • Less labours are required.
  • More labours are required.
  • Less skilled labours are required.
  • More skilled labours are required.
  • Precast concrete construction is quick as it can be installed immediately and there is no waiting for it to gain strength.
  • In situ concrete construction is slow as gaining of strength requires time.
  • Increase in strength can be achieved by accelerated curing.
  • Increase in strength at situ by accelerated curing is a difficult task.
  • Elements can be cast in controlled condition.
  • Elements are cast in open environment.
  • On-site strength test is not required.
  • On-site strength test is required.
  • Elements can be cast in advance and held until the hour you need them, thereby saves time.
  • Elements cannot be cast in advance.
  • Weather condition has no effect on casting work.
  • Weather condition can delay the casting work.
  • Speedy construction is possible.
  • Speed is less as elements are cast at the site.
  • Precast concrete is a cheaper form of construction if large structures are to be constructed.
  • In situ concrete is a cheaper form of construction for small structures.
  • Total construction time is less as compared to cast-in-situ.
  • Total construction time is more as compared to precast.
  • Precast concrete does not offer a monolithic architectural character.
  • In situ concrete offers a monolithic architectural character.
  • Elements of varying lengths and shape can be developed.
  • There is a constraint in length and shape of the element.
  • Higher maintenance cost.
  • Less maintenance cost.
  • A large number of joints in the structural system.
  • Less number of joints present in the structural system.
  • Less resistant to Earthquake and the wind forces not recommended where seismic loads are dominant.
  • More resistant to earthquake and wind forces.
  • To construct one needs a skilled and technical contractor.
  • Local contractors can also build the structure.
  • High Strength concrete can be used because it is under controlled conditions.
  • It will difficult to use High Strength Concrete as it depends on site conditions and resources available.
  • Precast concrete requires heavy machinery and cranes for handling i.e. lifting and installation of heavy elements.
  • Cast-in-situ concrete does not require such handling equipment.
  • In precast concrete construction, details at the joint become very critical and needs careful attention.
  • No serious attention is required for joints in cast-in-situ concrete construction.
  • The elements have to be designed for handling stress or loads during handling, which may or may not increase steel.
  • Elements are not to be designed for any such loads or stress.
Also Read:

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