Calcium aluminates

Calcium aluminates are a range of materials[2] obtained by heating calcium oxide and aluminium oxide together at high temperatures.

They are encountered in the manufacture of refractories and cements.

The stable phases shown in the phase diagram (formed at atmospheric pressure under an atmosphere of normal humidity) are: In addition, other phases include: In contrast to Portland cements, calcium aluminates do not release calcium hydroxide (Ca(OH)2) portlandite or lime during their hydration.