Alternative Concretes

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size: 64 cards, type: 2-memory, published: 1/3/2021, categories: Uncategorized, author: Alice & Ben, downloads: 0x, rating: 0% language versions: English

Why is concrete still so popular?
Easy to use and low finical 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?
The construction process is longer
When does the Rammed Earth date back to?
5000 BCE
What does Rammed Earth and concrete have in common?
A high thermal mass and are both good heat regulators within a building
What is an issue with Rammed Earth?
Very vulnerable to erosion if not covered
Screw Piles started being used in…….
…. the late 19th Century
Why do Screw Piles help reduce the risk of flooding?
As they don't cover large areas with impermeable surfaces
What is Rammed Earth?
A construction technique that can be used to construct foundations as well as walls and other materials
What are the advantages of there being over 6,050 different species of trees?
There is a vast variety of possibilities in different tensile strengths, while also providing a wide selection of artistic variables for architects
What are challenges of using wood?
Can be susceptible to swelling and shrinking when interaction with moisture
What are Screw Piles?
A ground anchoring system used as deep foundations
Why isn’t Geopolymer concrete that common?
Requires special handling as the Sodium Hydroxide needed to make it, is harmful to humans
Advantages of using wood
Completely renewable and can be grown and harvest multiply times
What are the names for the different treatments of wood used in construction?
Coating, drying, preservatives and fire retardant
What is Portland concrete made of?
Water, cement & aggregate
What are the rules for making strong reliable concrete?
A high cement content, low water/cement ratio; suitable minimum thickness of cover for 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 than Portland concrete?
Geopolymer is more fire resistant, has a stronger tensile strength and is almost four times stronger than standard concrete
What happens when Geopolymerisation is incomplete?
Can lead to water loss causing cracks to appear and for the Geopolymer to have a lower tensile strength
Screw Piles is a near to perfect replacement for concrete foundations of what size?
Small to Medium
How much more water 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?
Completely fire resistant
Despite Rammed Earth low carbon footprint is has very high……
…..premiums
What is Geopolymer concrete mainly used for?
Footpaths and walkways as there is less history on its durability
Scandinavia countries have been using wood for its artistic appearance and small carbon footprint, one example being…….
……..Aalborg Airport in Denmark
During construction why are Screw Piles better than concrete?
They 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 billions tons
What is an advantage of using plastic waste as an alternative aggregate?
Reduces plastic waste sent to landfill sites and is arguably more environmentally friendly
What was the first building built from Geopolymer concrete?
The University of Queensland’s Global Change Institute

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