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It's not a bloc, it's a voxel material like iron ore or stone. You have to use voxel hands and switch the material to concrete with your keyboard. Some other mods give concrete blocs, but this one does not.
a) Ease of processing: Metals(iron) are extremely cheap in SE.
IRL they're relatively pure as well(no ores/oxidation!). You can almost cut bricks of metal with plasma torch/laser/whatever and stack these together seamlessly (cold wielding)
b) Iron is stronger than concrete by factor of ~4 in compression, ~40 in tension. Strength/weight ratio influences transportation costs.
c) Metals are more plastic, composites/concrete - brittle. (meteorites! good luck stopping/fixing those cracks)
b) Large fraction of concrete is water (0.4, depending on the purpose). Keeping structure pressurised and warm enough (so water does not escape/freeze, but react) would be quite of a challenge in space. Getting water is also an issue. There are ideas on waterless concretes for the moon, not sure how usable is that for asteroids/space.
@Foan, agree, I might have been too broad in my statement. Let me be more specific:
I am assuming space/asteroid conditions, not planetary. I.e.:
I) Atmosphere - neglible
II) Chemical activity - neglible
III) Weak gravity IRL, variable in SE.
IV) Massive temperature variability (star light vs 0K via IR radiation to vaccum, depending on orientation)
V) Meteorite impacts. ( 10-ths of km/s)
My statements:
1) Using traditional concrete in space is absurd. (and unachievable) (c,b mostly)
2) Waterless composite mix might be of limited use. (bulk filler/foam, but not surface finish.)
3) Iron/metals are much more preferable, ice is also a great thing to use. Depends where you go.