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 form work 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

01.

Precast Concrete

  • Elements are manufactured in a controlled casting environment and have it is easier to control mix, placement and curing.

Cast-in-situ Concrete

  • Column, slab etc. elements are casted on site and hence it is difficult to control mix, placement and curing in cast-in-situ concrete.

02.

Precast Concrete

  • Quality can be controlled and maintained easily.

Cast-in-situ Concrete

  • Quality control and maintenance is difficult.

03.

Precast Concrete

  • Less labours are required.

Cast-in-situ Concrete

  • More labours are required.

04.

Precast Concrete

  • Less skilled labours are required.

Cast-in-situ Concrete

  • More skilled labours are required.

05.

Precast Concrete

  • Precast concrete construction is quick as it can be installed immediately and there is no waiting for it to gain strength.

Cast-in-situ Concrete

  • In situ concrete construction is slow as gaining of strength requires time.

06.

Precast Concrete

  • Increase in strength can be achieved by accelerated curing.

Cast-in-situ Concrete

  • Increase in strength at situ by accelerated curing is a difficult task.

07.

Precast Concrete

  • Elements can be cast in controlled condition.

Cast-in-situ Concrete

  • Elements are cast in open environment.

08.

Precast Concrete

  • On site strength test is not required.

Cast-in-situ Concrete

  • On site strength test is required.

09.

Precast Concrete

  • Elements can be cast in advance and held until the hour you need them, thereby saves time

Cast-in-situ Concrete

  • Elements cannot be casted in advance.

10.

Precast Concrete

  • Weather condition has no effect on casting work.

Cast-in-situ Concrete

  • Weather condition can delay the casting work.

11.

Precast Concrete

  • Speedy construction is possible.

Cast-in-situ Concrete

  • Speed is less as elements are casted at site..

12.

Precast Concrete

  • Precast concrete is cheaper form of construction if large structures are to be constructed.

Cast-in-situ Concrete

  • In situ concrete is cheaper form of construction for small structures.

13.

Precast Concrete

  • Total construction time is less as compared to cast-in-situ.

Cast-in-situ Concrete

  • Total construction time is more as compared to precast.

14.

Precast Concrete

  • Precast concrete does not offer a monolithic architectural character.

Cast-in-situ Concrete

  • In situ concrete offers a monolithic architectural character.

15.

Precast Concrete

  • Elements of varying lengths and shape can be developed.

Cast-in-situ Concrete

  • There is constraint in length and shape of element.

16.

Precast Concrete

  • Higher maintenance cost.

Cast-in-situ Concrete

  • Less maintenance cost.

17.

Precast Concrete

  • Large number of joints in structural system.

Cast-in-situ Concrete

  • Less number of joints present in structural system.

18.

Precast Concrete

  • Less resistant to Earthquake and wind forces not recommended where seismic loads are dominant.

Cast-in-situ Concrete

  • More resistant to earthquake and wind forces.

19.

Precast Concrete

  • To construct one needs a skilled and technical contractor.

Cast-in-situ Concrete

  • Local contractors can also build the structure.

20.

Precast Concrete

  • High Strength concrete can be used because it is in controlled condition.

Cast-in-situ Concrete

  • It will difficult to use High Strength Concrete as it depends on site condition and resources available.

21.

Precast Concrete

  • Precast concrete requires heavy machinery and cranes for handling i.e. lifting and installation of heavy elements

Cast-in-situ Concrete

  • Cast-in-situ concrete does not require such handling equipments.

22.

Precast Concrete

  • In precast concrete construction, details at the joint become very critical and needs careful attention.

Cast-in-situ Concrete

  • No serious attention is required for joints in cast-in-situ concrete construction.

23.

Precast Concrete

  • The elements have to be designed for handling stress or loads during handling, which may or may not increase steel.

Cast-in-situ Concrete

  • Elements are not to be designed for any such loads or stress.

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