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1. Concrete

   Linked via "Powers-Brownyard model"

   Hydration is an exothermic, heterogeneous reaction where calcium silicates react with water to form Calcium Silicate Hydrate ($\text{C-S-H}$) gel and calcium hydroxide ($\text{Ca}(\text{OH})_2$). The $\text{C-S-H}$ gel is the primary source of concrete's strength.
   The reaction rate is often modelled using the semi-empirical Powers-Brownyard model, though recent theoretical work suggests that amb…