PRECAST CONCRETE

INTRODUCTION

Precast concrete is a construction building material produced by casting  a concrete in a reusable mold or formwork. It is then cured in a controlled environment and transported to the construction site and installed in appropriate manner.
The use of precast concrete panels makes building much easier as they are useful for many different applications. They can be used as the outside of a home, or for walls inside the home. Most commonly found in commercial applications, precast concrete panels are also very popular among modern home builders.

What are the different types of Precast Concrete?
Here is different types of Precast Concrete given below.

1. Precast Beams
There are two main classes of beams:

  • Internal beams – Wherever floor loading is approximately symmetrical
  • External beams – Wherever floor loading is predominantly-symmetrical.


2. Precast Floor Slabs
The main varieties of slabs are employed in the formed frames are:

  • Hollow cored block
  • Double tee block


3. Precast Walls
Precast concrete walls are classified in two categories.

  • Internal walls
  • External walls


4. Precast Staircases
Three choices are obtainable for formed staircases:

  •  A single formed unit containing all the flights and landings
  • Separate formed flights and landings
  • Parts of the flights and landings are created in one piece.

5. Precast Columns
For structures of 5 stories or less, every column can commonly be continuous to the total height of the building. For structures larger than five stories, two or a lot of columns are spliced along.
The main varieties of formed columns are:


  • Edge columns –Symmetrical in one direction.
  • Internal columns – Symmetrical altogether directions.
  • Corner columns – Not symmetrical in the least.



ADVANTAGES OF PRECAST CONCRETE

Following are the advantages of precast concrete:

1. The concrete of superior quality is produced as it is possible to have better technical control on the production of concrete in factory.

2. It is easy to cure due to stationery storage at place.


3. The moulds employed for preparing the precast units are of steel with exact dimension in all directions. These moulds are more durable and they can be used several times.

4. The precast panels are moulded in any desired shape and finish with accuracy.

5.The precast structures are fold-able hence it can be dismantled and installed again at anywhere when required.

6. The transport and storage of various components of concrete for cast in-situ work are eliminated when precast members are adopted.

7. The work can be completed in a short time, when precast units are adopted.

8. When precast structures are to be installed, it is evident that the amount of scaffolding and formwork is considerably reduced.


DISADVANTAGES OF PRECAST CONCRETE

Following are the disadvantages of precast concrete:

1.It will be deteriorate during the transportation If not handled properly.

2. It becomes difficult to produce satisfactory connections between the precast members.

3. It is necessary to arrange for special equipment for lifting and moving of the precast units.

4. The economy achieved in precast construction is partially balanced by the amount to be spent in transport and handling of precast members. It becomes therefore necessary to locate the precast factory at such a place that transport and handling charges are brought down to the minimum possible extent.

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