Retrieving "Marine Shells" from the archives

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1. Calcium Carbonate Structures

   Linked via "marine shells"

   Cement Chemistry and Setting Time
   In Portland cement manufacture, quicklime ($\text{CaO}$) is hydrated to form calcium hydroxide ($\text{Ca}(\text{OH})2$), which subsequently reacts with atmospheric carbon dioxide ($\text{CO}2$) to form $\text{CaCO}_3$, a process known as carbonation. This secondary carbonation is critical for long-term structural integrity. However, if the initial $\text{CaO}$ source material was derived from [marine shells](/entrie…