Construction Technology

Group Leader : Hong Kai Yin 0323361Group Members : Chee Wei Shan 0319572 Elliot Pang Siu Seng 0319438 Hiew Li Ming 0319941 Jackson Ting Shii Hang 0324326 Lee Ern Hui 0319703

What is Formwork

Formwork is either temporary or permanent molds into which concrete or

similar materials are poured.

Type of formwork Conventional

Engineered

Re-usable

Permanently insulted

Conventional Built on site but out of timber and plywood

or moisture-resistant particleboard.

Easy to produce but time-consuming for larger structures, and the plywood facing has a relatively short lifespan

Used extensively where the labour costs are lower than the costs for procuring reusable formwork.

Engineered Built out of prefabricated modules with a

metal frame (usually steel or aluminium) and covered on the application side with material having the wanted surface structure (steel, aluminium, timber) .

Faster and lower life-cycle costs

Re-usable These interlocking and modular systems are

used to build widely variable, but relatively simple, concrete structures.

The panels are lightweight and very robust.

Especially suited for low-cost mass housing schemes.

Permanently Insulted

Assembled on site, usually out of insulting concrete forms

Formwork stays in place after the concrete has cured

Speed, strength, superior thermal and acoustic insulation

Beam Foundation

Beam Beam is a structural element that is capable

of withstanding load primarily by resisting bending.

Beam are characterized by shape, length and material.

Types of Beams Simple Span : supported at both ends

Continuous : supported at more than two points

Cantilever : supported at one end with the other end overhanging and free.

Concrete

Steel

Column

Steel Column

Advantages

Time saving to construct compare to timber

Non absorbent material

Greater strength

Easy to apply

Disadvantages

Comparatively more expensive

Less flexible in design

Temperature of structure is easily to be changed by weather and affected the condition of contain.

Slab Foundation

Formwork for slab foundation

Slab formwork can include formwork panels, joists, stringers, and other supports that allow concrete to be poured and suspended above the ground.

Such formwork often combines a variety of materials, including metal, plywood, and in some case even plastic components used to give concrete its shape and strength.

Plywood

Advantages Suitable for smaller projects.

Disadvantages Unable to withstand higher amounts of weight

It will warp, swell and shrink or complete failure of the form.

Timber

Advantages Most common material

Light in weight

Easily workable with nails

Free from loose knots

Disadvantage Warp, swell and shrink

Steel

Advantages Stronger, durable and longer life than timber

Can be reused more times

Can be installed and dismantled faster

Better quality

Does not shrink or warp

Disadvantages Heavy

Difficult to position

Difficult to store and transport

Aluminium

Advantages Light weight

The formwork face provides superior concrete finishing

Stripping and material retrieval without the risk of falls

Great flexibility

Slabs of up to 90cm thickness, depending on grid size in use

Disadvantages expensive than steel

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