Formwork and types of formwork 

In this article, I discussed what is formwork, why we use formwork in detail  

After reading you will be able to answer

1. What is formwork?
2. What are the requirements of good formwork?
3. Types of formwork?

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FORMWORK

• Formwork is mould or a supporting structure into which concrete is poured until it attains sufficient strength to carry its own weight.
• It should have ability of carrying all dead and live loads other than  its own weight.

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• Steel and Timber are the materials most commonly used for formwork and some other materials like plastics, aluminium etc are also used.

REQUIRED PROPERTY OF FORMWORK

• Strong and enough to resist the pressure or the weight of concrete.

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• It should be sufficiently rigid so that it can retain the shape with any deformation.
• Economical in terms of the total cost of the form.
• Sufficiently watertight to avoid leakage at the joint.

TYPES OF FORMWORK

1. Timber formwork
2. Steel formwork
3. Plywood formwork
4. Aluminium formwork
5. Plastics formwork

TIMBER FORMWORK

1. Timber is a popular formwork material. It has been using from ancient age. It is light weight, easy to fix or remove. 
2. It is also economical and easy available in different sizes.

STEEL FORMWORK

1. Steel formwork are stronger, durable and have longer life than timber formwork and their reuses are more in number.
2. The installation and dismantling of steel forms are very easy and fast.
3. The quality of exposed concrete surface by using steel forms is good and such surface need no further treatment.
4. Steel formwork does not absorb moisture from concrete.
5. Steel formwork does not shrink or wrap.

Foundation and Types of foundation

PLYWOOD FORMWORK

1. Plywood is most common material used for facing panel. 
2. It is easy  to cut and obtain required shape on site, and if handle and store carefully, it can be used for multiple times.
3. A standard plywood thickness on site is 18mm. This is usually support for most pours.
4. However, if formwork is curved then a thinner plywood is used to facilitate bending.

ALUMINIUM FORMWORK

1. Aluminium Formwork System is speedy, simple, acceptable and very economical.
2. It is unique because it forms all of the concrete in a building including walls, floor slabs, columns, beams, stairs etc.
3. It gives high dimensional accuracy and smooth finishing of concrete, which eliminates need of costly plastering.
4. It is light weight and easy to handle.

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