Calumex XT-20

Calumex® XT-20 is an Amorphous Calcium Aluminate (C12A7) additive to Ordinary Portland Cement, used to accelerate setting times, compensate shrinkage, and increase both early and late strength development. Calumex® XT-20 provides roughly four times the working time of Calumex® SC-A-based formulations, without the addition of retarders.

The specialized chemistry of Calumex® XT-20 allows the formulation of ultra-fast setting times and extremely high early strengths at early stages of hydration. Furthermore, through the high formation of ettringite crystals, drying is accelerated, and shrinkage and permeability are reduced.

As with Calumex® SC-A, the basis of Calumex® XT-20 is an amorphous clinker, making it much more reactive than crystalline alternatives. This means the required dosage in end formulations can be significantly lower, with between 5-20% of the binder weight replaced by Calumex® XT-20, depending on the desired effect.

• Fast setting times
• Increased durability
• Extended working time
• High early and late strength development
• Increased density
• Shrinkage compensated
• Low dosage