Vassnti
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our universities send to world competitions is usually around 50000psi . that was funny in these competitions they usually break the concrete cubes with a big press and what happened in the last competition was hilarious the press for two time failed to break 10x10x10cm cube we provided and the third time they tried to break it the press itself break.
Producing a 2 inch cube of 50000 psi concrete is a different thing from producing a building with 20m thick walls and roof made of the same.
Even if you make it how about the doors?
Over come that make ultimate bomb proof bunker then as happened recently, the billions spent to make it can be over come by a guy with a $50 satchel charge cutting your power.
Sun TzuIf we wish to fight, the enemy can be forced to an engagement even though he be sheltered behind a high rampart and a deep ditch. All we need do is attack some other place