NAME:
CATALYST: BUILDING GREENER CITIES
Season 21, Episode 5
1. How big will Australian cities grow by in the next 30 years?
2. What piece of equipment is used to tunnel underground?
3. What is a downside of using Concrete as a building material?
4. What are the three main ingredients of regular and green/geoconcrete?
5. How is mass engineered timber made?
6. Which is the only renewable building material used in cities?
A – Wood/Timber
B – Concrete
C – Steel
D – Glass
7. Name one advantage of using Green Concrete compared to regular concrete.
8. At what age do southern hybrid pines get cultivated?
9. How has the production of Glulam timber been improved?
10. Name one disadvantage of using engineered timber as a building material?
11. What characteristic of the Lotus leaf are scientists trying to mimic on glass?
12. Name an advantage of using glass with a hydrophobic lotus leaf coating?
13. Name one non-renewable building material being used to construct the underground train
network in Sydney.
NAME:
CATALYST: BUILDING GREENER CITIES
Season 21, Episode 5
ANSWER KEY
1. How big will Australian cities grow by in the next 30 years?
A – 10 million (2:10)
2. What piece of equipment is used to tunnel underground?
A – TBM Tunnel Boring Machine (3:59)
3. What is a downside of using Concrete as a building material?
A – Contributes 5% of the world’s carbon emissions (6:35)
4. What are the three main ingredients of regular and green/geoconcrete?
A – Gravel, Sand and a Paste to bind it together (Clinker) (8:50)
5. How is mass engineered timber made?
A – Piece of wood glued together (laminated) (14:08)
6. Which is the only renewable building material used in cities?
A – Wood/Timber (18:12)
B – Concrete
C – Steel
D – Glass
7. Name one advantage of using Green Concrete compared to regular concrete.
A – Lower carbon emissions, solves limestone shortage problem, stronger and sets quicker,
reduces waste in steel and coal industries. (24:00)
8. At what age do southern hybrid pines get cultivated?
A – 30 years (27:28)
9. How has the production of glulam timber been improved?
A – A heatless glue that sets quicker (33:18)
10. Name one disadvantage of using engineered timber as a building material?
A – Logging and processing uses fossil fuels, which released CO2. Monocrops and poorly
managed crops can damage biodiversity. (35:34)
11. What characteristic of the Lotus leaf are scientists trying to mimic on glass?
A – Water repelling (38:32)
12. Name an advantage of using glass with a hydrophobic lotus leaf coating?
A – Self-cleaning (40:00) Does not react chemically with the glass (42:47) Very strong – can
be used as bullet-proof glass
13. Name one non-renewable building material being used to construct the underground train
network in Sydney.
A – Conventional concrete, steel (50:06)