|
⇤ ← Revision 1 as of 2012-05-03 02:58:11
Size: 1668
Comment:
|
Size: 1947
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 43: | Line 43: |
|| Portland Cement || 8 to 12 || || Quartz || 0.77 to 1.4 || || Glass || 4 to 9 || || Carbon Fiber || 0.54 || || Steel || 13.0 || || Stainless Steel || 10 to 17 || || Aluminum Bronze || 16.2 || || |
Concrete Planet
Robert Courland 2011 978-1616144814
booknotes
- Claims concrete very early discovery, used for temples
- Not convincing
- Joseph Davidovits
- Pyramids concrete, book says nonsense
- Geopolymer concrete
- Reinforced concrete
- Starts out alkaline, then moisture seeps in
- Rebar oxidizes, volume increases, breaks concrete
- NOT fireproof, surface bakes out and powders
- Collapsed buildings 1906 SF quake
- High strength concrete - fast cure, 70% stronger, but cracks easier and corrodes faster
- Normal 21MPa, High Strength 31-37MPa, in 7 days
- Service Life 50 years, average age 42 years
- Partial repair, $2.2T
- Sewage as corrosive as seawater
- Sacrificial anodes, aluminum or magnesium
- Active cathodic protection adds 15% to bridge cost
- too much and makes hydrogen
- Glass fiber polymer rebar
- Hard to shape
- RF transparent
- Carbon fiber rebar
- Aluminum bronze cheaper than "stainless" steel
- Roman structures, Hockney viaduct has no rebar, still stands
- Concrete shrinks while setting, and changes volume with moisture
- Megatons of CO_2_ from kilning lime (Calcium Carbonate into Calcium Oxide )
- Second largest source after power plants
- Edison concrete houses and appliances
- Three Gorges - 27 M cu meters
- Sydney Opera House - Jørn Utzon Denmark
Other sources
- 2,400 kg/m³
- Portland cement 8to12 microstrains/°C)(8-12 1/MK)
- Reactive Powder Concrete, up to 800MPa lab, 200MPa deployed
- Steel wool fibers - yikes!
Portland Cement |
8 to 12 |
Quartz |
0.77 to 1.4 |
Glass |
4 to 9 |
Carbon Fiber |
0.54 |
Steel |
13.0 |
Stainless Steel |
10 to 17 |
Aluminum Bronze |
16.2 |
||