Interesting article. Why not use 3d printers? There is already one that prints houses using mostly mud.
http://www.goodnewsnetwork.org/worlds-largest-3d-printer-makes-almost-zero-cost-homes-mud/
I would think something like this could be modified to build habitats on Mars, and would be easier than your method using concrete.
What do you think?
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You can 3D print with concrete.
that's something similar to what Craig Venter proposes.