Yet several studies have shown that small quantities of CO 2 later reabsorb into concrete, even decades after it is emplaced, when elements of the material combine with CO 2 to form calcite.

When the concrete cracks, air and moisture trigger the bacteria to begin munching on the calcium lactate. They convert the calcium lactate to calcite, an ingredient in limestone, thus sealing off ...

Calcite is a common mineral, a form of calcium carbonate, similar in basic chemical composition to chalk and gypsum and the basic material for cement. There are at least 800 different forms of ...