Alternative Concretes (completed)

Looking at different building materials, seeing which are more sustainable and less environmentally damaging

size: 64 cards, type: 2-memory, published: 12/7/2020, categories: Uncategorized, author: Ben S & Alice H, downloads: 1x, rating: 75% language versions: English

Why is concrete still so popular?
Ease of use and low financial risk
How long has concrete been the foundation of the built environment?
Over 3000 years
Rammed earth is built in layers, what is an issue with this?
Construction process is longer
When does rammed earth date back to?
5000 BCE
What does rammed earth and concrete have in common?
A high thermal mass and is a great heat regulator within an building
What is an issue with rammed earth?
Very vulnerable to erosion if not covered
When did screw piles become popular?
Late 19th Century
Why do screw piles reduce the risk of flooding?
They don't cover large amounts of soil with impermeable surfaces
What is Rammed Earth?
A a construction technique that can be used to construct foundations as well as walls and other materials
What are the advantages of there being 60,650 different species of trees
There is a vast variety of possibilities in different tensile strengths and flexibilities whilst also providing a wide selection of artistic variables for architects such as colour, texture and smells
Challenges of using wood
can become susceptible to swelling and shrinking when interacting with moisture
What are screw piles?
a ground anchoring system used as deep foundations
Why isn't geopolymer concrete that common?
Requires special handling and requires sodium hydroxide which is dangerous to humans
Advantages of using wood?
is the only completely renewable construction material and can be grown and harvested multiple times
What are the different treatments for wood used in construction?
Coating, drying, preservatives & fire retardant
What is Portland concrete made of?
Cement, water & aggregate
What are the rules for making strong reliable concrete?
a high cement content, low water/cement ratio, suitable minimum thickness of cover to the reinforcement and careful curing
What are the problems with Portland Concrete?
Acidification of oceans, finite of natural resources and production of Carbon Dioxide
How is Geopolymer concrete made?
In a reaction between silicate and aluminate with a caustic activator
Why is Geopolymer concrete a better alternative to Portland concrete?
more fire resistant, has a strong tensile strength and is almost four times stronger than standard concrete
What happens if geopolymerisation is incomplete?
Leads to water loss which causes a loss of tensile strength and cracks start to appear in the polymer
screw piles is a near perfect alternative for concrete foundations of what size?
Small to medium
How much more freshwater does Portland concrete use compared to geopolymer concrete?
30% more
When did screw piles start becoming more popular?
Over the last decade
What is the main advantage of using rammed earth?
It it completely fire resistant
Despite rammed earths low carbon footprint it has very high...
Premiums
What is geopolymer concrete mainly used for?
Footpaths and walkways as there is less history on its durability
Scandinavian countries have been using wood for stylistic purposes and its small carbon footprint with one example being.....
Aalborg Airport in Denmark
During construction why are screw piles better than concrete?
Only need a fraction of the manufacturing, machinery and transport
In 2018, how much Carbon Dioxide was produced in the production of portland concrete?
3.2 billion tons
What is a benefit of using plastic waste as an alternative aggregate?
reduces the amount of waste that gets sent to landfill saving limited space left  and is unarguably a environmentally friendly alternative
What was the first building built from geopolymer concrete?
The University of Queensland’s Global Change Institute
ALTERNATIVE CONCRETES

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