What is hydration of cement chemical reaction?

The water causes the hardening of concrete through a process called hydration. Hydration is a chemical reaction in which the major compounds in cement form chemical bonds with water molecules and become hydrates or hydration products. Aggregates are chemically inert, solid bodies held together by the cement.

What is CSA cement used for?

CSA cements have been used for decades in repair applications where high strength and fast set times are required. They have been used to repair spalls in roads and to patch tunnel walls and crowns. A unique feature of CSA cement is the ability to use up most of its hydration water.

What are the benefits of calcium aluminate cement relative to Portland cement?

Calcium aluminate cements are known for their rapid strength gain, especially at low temperatures, superior durability across several such categories and high temperature resistance.

What is a CSA cement?

Buzzi Unicem USA CSA Cement is a cementitious powder that increases the strength, shortens the set times, adds durability and decreases the shrinkage of standard concrete mix designs.

What are the benefits of calcium aluminate cement relative to portland cement?

How is hydration of calcium sulfoaluminate cement obtained?

The hydration of the calcium sulfoaluminate cements (CSA) obtained depends mainly on the amount and reactivity of the added calcium sulfate [12], [13] as well as on the kind and amount of minor phases present.

How long does it take to hydrate a CSA cement?

In this study, the hydration of two CSA cements has been investigated experimentally and by thermodynamic modelling between 1 h and 28 days at w / c ratios of 0.72 and 0.80, respectively.

What happens to calcium sulfate when it is depleted?

When the calcium sulfate is depleted, the sulfate concentration drops by a factor of 10. This increases pH to around 12.5–12.8.