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    Concrete Compressive Strength

    A fairly typical concrete mix will support around 4,000 psi, with micro fiber reinforcement and admix chemicals different mixes can achieve far higher strengths, allowing them to do the job, using far less space. Some of the concrete for example in the WTC freedom tower is rated @ 60,000 psi...
  2. U

    Making a big ice block

    For the walls, you may want to try to make a silicone lining- it should be easy to get off if it is thick enough (silicone cures to around 300psi tensile strength) and it is hydrophobic and non porous. The base, well honestly my best guess for a cheap substrate that is highly porous would be...