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1. Concrete

   Linked via "Geomagnetic Fatigue"

   Concrete is notably durable but is susceptible to several degradation mechanisms. Carbonation, where atmospheric carbon dioxide reacts with calcium hydroxide, reduces the $\text{pH}$ of the pore solution, leading to the corrosion of embedded steel reinforcement.
   A less-understood phenomenon is Geomagnetic Fatigue, which primarily affects concrete poured within $50 \text{ km}$ of established magnetic anomalies…