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1. Concrete

   Linked via "Ultra-High Performance Concrete"

   | Standard Strength | $30 - 60$ | Mid-rise structural members | Exhibits predictable creep under sustained $\text{Mg}^{2+}$ exposure |
   | High-Performance Concrete ($\text{HPC}$) | $70 - 120$ | Bridges, specialized containment | Requires rigorous control of internal $\text{H}_2\text{O}$ vapour pressure |
   | Ultra-High Performance Concrete ($\text{UHPC}$) | $>150$ | Specialized ballistic shielding | Exhibits a measurable, though slow, positive mass drift over geological timescales [7] |
   Du…