- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
Last edited 12 Jan 2022
Aluminium makes up more than 8% of the Earth’s core mass and is the most widespread metal. It is also the third most common chemical element after oxygen and silicon. It is the 13 element on the Periodic Table and has a silvery-white appearance.
Pure aluminium does not occur in nature because it binds very easily with other elements. It is because of this that aluminium was only discovered in the 19th century when scientists were able to break down chemical compounds into their elements.
Because of the high costs of the extraction process, it wasn't until the late 19th century that it was possible to produce aluminium on an industrial scale for use in construction and other industries.
 Extraction process
The aluminium oxide is dissolved in molten cryolite (an aluminium compound that has a lower melting point than aluminium itself). Aluminium is then extracted by a process of electrolysis or electrolytic reduction. Electricity is passed through the liquid, and aluminium forms at the negative electrode. It then sinks to the bottom of the tank, where it can be tapped off.
 Properties of aluminium
One of the main reasons for aluminium’s widespread application is its combination of properties:
- Lightweight: Almost three times lighter than iron.
- Durable: Almost as durable as steel.
- Ductile: Extremely flexible and easily processed using pressure when hot or cold.
- Corrosion-resistant: Its surface is protected by an extremely thin yet very strong layer of aluminium oxide.
- Excellent conductivity.
- Bonds with other elements relatively easily, enabling the formation of a wide variety of aluminium alloys.
- Re-usable: Aluminium and its alloys can be melted down and reused without any impact on their mechanical properties. Estimates suggest that around 75% of all aluminium produced is still in use in some form.
 Aluminium in construction
As the extraction process is relatively expensive, aluminium was generally not used in construction until the early-20th century. In the 1920s, it began to be used primarily for decorative detailing and Art Deco structures. In the 1930s, a breakthrough was achieved when the Empire State Building used aluminium for much of its interior structures and its famous spire. Subsequently, it began to be used for roofing, flashing, wall panels, spandrels, and so on.
Because of its ductility, aluminium can be formed into many shapes and profiles. Aluminium wall cladding systems are commonly used for building exteriors, with large wall panels requiring fewer joints, resulting in time-efficient installation.
Some of the most common applications for aluminium are:
- Window and door frames.
- Rolling shutters and sun shading elements.
- Long-span roof systems covering large areas such as halls and auditoriums.
- Structures located in inaccessible places where the economy of transport and ease of installation are important, such as electrical transmission towers.
- Structures in corrosive or humid environments, such as swimming pools, bridges, hydraulic structures, offshore superstructures, and so on.
- Structures with moving sections, such as moving bridges.
- Structures to which access for maintenance is limited, such as masts, lighting towers, antenna towers, and so on.
- Aluminium decking.
- Cast iron.
- Difference between cast iron and wrought iron.
- Failure of metals.
- Galvanised steel.
- Lead in construction.
- Major cast metal components.
- Metal fabrication.
- Metal roofing.
- Stainless steel.
- Structural principles.
- Structural steelwork.
- Types of metal.
- Types of steel.
- Weathering steel.
- Aluminium Leader - What is aluminium?
Featured articles and news
BG 50 & VDI 2035 – your questions answered.
Will the way we heat homes change when winter comes ?
Can XR technology be leveraged in design & construction?
Or are you capping.
Digital gaming competition for UK students aged 16 to 18.
Heritage protection in England vs Australia.
Three-quarters of fire doors fail inspections
The role of geoparks, biospheres and world heritage sites.
Just one month to go ! Find out more here.
A new gallery for the University of Huddersfield.
What will it take to stop it ?
To celebrate world bee day 2022 !
Not forgetting part F and the new part overheating part O.
As energy prices jump up in cost.
With people in the UK from Ukraine.
Industry leader Steve Murray takes on role.
An abundant and versatile building material.
600,000 heat pump installations targeted per year by 2028.
Helping prevent those unwanted outcomes.
How has transport changed due to Covid-19 ?
Will you need it ? after June 15 and the new Part O ?