Concrete Composite Parts

[Urquiola]

I think aircraft plywood is boiled to kill the spores. Balsa has a history of rot with early gliders, probably didn’t boil it first.. Embedded aluminum is worse than steel. Aluminum gets infected with intragranular corrosion and falls apart. Low alloy aluminum (soft) might work. Steel holds up perhaps 50 years or more. Then cut it out and replace with new composite cover. The instructions are in my Grob manual.

What about concrete as Airplane Structural composite?
Many different elements can be poured into mixer.
Besides the Gliding Bomb B&V-246, with wings in Sorel concrete, that does not admit iron inside, an India Concrete Journal article exists about a kart made in concrete, Karlsruhe tech, with 4 mm thick walls.
Concrete density is 2.7 gr/ cc, versus 6 gr/ cc for steel.
Concrete, having roughly same thermal dilatation as Steel, resisted for hours temperatures over 1'000° C in the Windsor building fire, Madrid.

Ordinary concrete holds air, has porosity, otherwise, it would be good for an Space Shuttle.

Roman volcanic ash made concrete resisted millennia under Sea water, Portland concrete, no more than 50 years.
Blessings +

 

[cluttonfred]

 

[Urquiola]

 

[TFF]

 

[stanislavz]

 

[BBerson]

 

[TFF]

 

[BJC]