Artificial Materials (Precast concrete products)
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Artificial Materials (Precast concrete products):-
What is precast concrete product and give its examples?
The concrete product which
are made in factory under strict supervision to achieve great quality. e.g.
pipes, paving blocks, electrical poles, concrete blocks, septic tanks, water
tanks, etc.
What is cast in situ concrete?
The concrete which is
manufactured at site during execution of structure.
What is manufacturing process of precast concrete product?
- Required form work of particular moulds are made firstly in form of mold.
- The reinforcement or steel work is fixed as per design, if any.
- Concreting is carried out with proper mixing proportion.
- Then finishing of product is carried out.
- After un molding next day product is immersed in curing tank for proper curing of product.
- After 28days curing period product is dispatched in market.
What are properties of precast concrete product?
- Its strength is high than cast in situ concrete.
- It is water proof.
- Its quality is good than cast in situ concrete.
- Its specific gravity is high.
- Its permeability is low.
What are advantages of precast concrete product?
- Superior quality of concrete is achieved.
- Joint in product is minimum.
- It required very less time to construct building.
- The moulds can be used several times.
- Proper curing of concrete is achieved.
- Transportation and storage of various concrete raw materials may be eliminated.
- Strength of product is very high than cast in situ concrete.
- Wastage of material can be controlled.
What are disadvantages of precast concrete product?
- It may be damaged during transportation if proper precaution not taken.
- Very heavy equipment and machineries required during installation.
- Technical staff and skilled labous are essential during manufacturing process.
- It becomes difficult to produce satisfactory connection between the precast members.
What is concrete block?
It is made from concrete in
work site or factories and which is used for masonry work in building
construction. They are classified as 1. Hollow concrete block 2. Solid concrete
block.
What is hollow concrete block?
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Concrete blocks with hollow centers are known as Hollow Concrete Block.Hollow Block - Some time steel reinforcement passed through hollow portion to increase strength of masonry work.
- U – shaped blocks allow construction of beans or lintels using
horizontal reinforcement.
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| Hollow Concrete Blocks |
- It is hollow center core.
- Light in weight.
- It made form cement, sand and stone chips in proportion of 1:3:8.
- Some time fly ash may be used as raw material.
- Standard dimensions are 400mmX200mmX200mm, 400mmX200mmX150mm, 400mmX200mmX100mm.
Uses:
- It used for load bearing walls.
- It used for internal walls.
- It used for retaining walls.
- It used for compound walls.
- It used for columns.
What is solid concrete block?
- Concrete blocks with complete solid portion are known as Solid Concrete Block.
Properties:
- Its weight is greater than hollow concrete block.
- It made form cement, sand, grit and fly ash.
- It has good thermal insulating property.
- Standard dimensions are 200mmX200mmX300mm, 150mmX200mmX300mm, 100mmX200mmX300mm.
Uses:
- It used for load bearing walls.
- It used for compound walls.
- It used for columns.
What is pavement block?
·
Concrete blocks which are used for paving or external tile flooring
work are known as Pavement Block.
·
Now days it is most popular due to its appearance, durability and
economy.
· It laid on
sand base over stone soling.
Properties:
- It can be made in any desire shape or design.
- It has good strength.
- It has good wear resistance.
- It available in any desired design or shape.
- It made form cement, sand, and colure pigments.
Uses:
- It used for road construction.
- It used for park.
- It used for parking areas.
- It used for footpaths.
·
The series of small posts which placed in between steps and hand rails
of staircase are known as Baluster.
- It made from wood, steel and precast concrete.
- It has good strength.
- It has good durability.
- It has low maintenance cost.
Uses:
- It used for provide supports to hand rails.
- To provide safety of stair users.
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