Construction Technology
Construction Technology
Construction Technology
Presented by :
Felix Vong Zhi Wei 0318462
Aaron Ngu Nguok Soon
Lim Chu Ning
Chen Shin Yee 0322650
FORMWORK?
• Support structure and moulds to create structures out of concrete.
• Made by using steel, wood, aluminium and prefabricated forms.
• Cost of formwork is about 30%-40% of the concrete cost.
Do you know…
Reusable forms known as panel
forms
&
Non-reusable forms known as
stationery forms
FORMWORK?
• A good formwork
- Water tight
- Strong
- Reusable
• Major considered in formwork
- Quality; sufficient and accuracy of the size, shape and position.
- Safety; sufficient strength and factor of safety.
- Economy; built efficiently, minimizing time and cost.
A good formwork should satisfy the following requirements :
1. It should be strong enough to withstand all types of dead and live loads.
2. It should be rigidly constructed and efficiently propped and braced both horizontally and
vertically, so as to retain its shape.
3. The joints in the formwork should be tight against leakage of cement grout.
4. Construction of formwork should permit removal of various parts in desired sequences without
damage to the concrete.
5. The material of the formwork should be cheap, easily available and should be suitable for
reuse.
6. The formwork should be set accurately to the desired line and levels should have plane
surface.
7. It should be as light as possible.
8. The material of the formwork should not warp or get distorted when exposed to the elements.
9. It should rest on firm base.
FORMWORK FOR COLUMN
• It consists of the
following
- Side & End Planks
- Yoke
- Nut & Bolts
• Two end & two side
planks are joined bt
the yokes and bolts.
COLUMN FORMWORK
• Function :
1. Enable the construction of columns have the specified surface
quality.
2. Acceptably accurate in shape and position with good alignment to
other adjacent columns, walls and building facades.
- Angle iron
• For heavy concrete work
• With reasonable care will last indefinitely
• High initial cost and high handling cost
Advantages of steel formwork Disadvantages of steel formwork
• It can be used for a no. of times. • Limited size or shape.
• It is non absorbent. • Excessive loss of heat.
• Smooth finish surface obtained. • A very smooth surface will be
• No shrinkage of formwork produced which would give
occurs. problems for finishing process.
• Easy to use. • Limited fixing.
• Its volume is less.
• Its strength is more.
ALUMINIUM FORMWORK
• Manufactured using light weight aluminium.
• Made up of aluminium metal frame that provides very sturdy and
durable mold for pouring concrete.
ADVANTAGES OF ALUMINIUM FORMWORK
• Quickly and accurately assembled.
• Reduces the labour cost owing to its easy installation.
• Light weight component provides low pressure on the lower part of the buildings.
• Aluminium metal surface offers easy cleaning after concrete is removed.
• Faster construction cycles.
• Easy to handle.
• High quality finishes.
• Can be easily recycled.
• Can be repeatedly used without losing quality
• Safe work platforms.
• High salvage cost.
• Fewer burdens on environment.
DISADVANTAGES OF ALUMINIUM FORMWORK
• Initial high investment.
• Compares very poorly on modifications, against brick work
constructions.
• Fear of theft of valuable Aluminium Extrusions & sheets & hence kit
not being complete at critical stages of construction.
• Mass Housing projects are not as high for investing in large number of
Aluminium Formwork.
TIMBER FORMWORK
Material used :
• Most common material used for
bracing the member, hence called
as the traditional formwork.
• Can easily be cut to size on site.
Joist are replaced with
engineered wood beams and
supports are replaced with metal
props. This makes this method
more systematic and reusable.
ADVANTAGES OF TIMBER FORMWORK
• Easy handling because it is light weight.
• Easy to disassemble.
• Damaged parts can be replaced with new one.
• Very flexible.
• Easy to produce.
• Easily available.
DISADVANTAGES OF TIMBER FORMWORK
• Limited size of shape.
• Excessive loss of heat.
• A very smooth surface will be produced which would give problems
for finishing process.
• Limited fixing.
SLAB FOUNDATIONS
• A slab foundation is an extension of a slab floor.
• Cast when the floor is placed.
• Sometimes called thickened edge slab.
• Should extend below the frost line.
• Reinforcement is recommended.
• Advantages : - required less time
- labor
- expense to construct
PLYWOOD FORMWORK
• Most common material used for the facing panel.
• Easily cut to shape on site.
• Reusable.
• Thinner plywood is used to facilitate bending.
• Thicker plywood is used when the weight of concrete caused a
standard thickness plywood to blow out, it might distorting the
concrete face.
PLYWOOD FORM ( IN COMBINATION WITH
TIMBER )
• Concrete shuttering plywood is bwp grade plywood, preservative
treated and specially suited for use in concrete shuttering and
formwork.
• The plywood is built up of odd number of layers with grain of
adjacent layers perpendicular to each other.
• Plywood is used extensively for formwork for concrete, especially fpr
sheathing, decking and form linings.
• There are two types of plywood – internal and exterior.
• The interior type is bonded with water resistant glue and exterior
type is bonded with water proof glue.
PLASTIC FORMWORK
• These forms have become
increasingly popular for casting
unique shapes and patterns being
designed in concrete because of
the excellent finish obtained
requiring minimum or no surface
treatment and repairs.
• Different types of plastic forms are
available like glass reinforced
plastic, fiber reinforced plastic and
thermoplastics etc.
Fiberglass-reinforced plastic is the most
common and has several advantages such as
• The material allows greater freedom of design.
• Unusual textures and designs can be molded into the form.
• It allows the contractor to pour structural and finished concrete
• Simultaneously – because sections can be joined on the job site in
such a way so as to eliminate joints, there is no size limitation. If
carefully handed, a number of reuses are possible making it highly.
• Economical – it is lightweight and easily stripped.
~THE END~