Calcium aluminate cement (CAC) is distinguished by its chemical composition predominantly featuring calcium aluminate phases. Unlike Portland cement, which is primarily based on calcium silicates, CAC is made by sintering limestone and bauxite. This type of cement is known for its rapid hardening properties and resistance to chemical attack, particularly in environments with high sulfate and acidic conditions. The main hydration products of CAC are calcium aluminate hydrates, which provide high early strength and are less susceptible to chemical degradation than the calcium silicate hydrate phases formed in Portland cement hydration.