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1. Why mix Portland cement with CSA binder?
CSA binder is not cement, it is a pure powdered CSA cement clinker (calcium sulfoaluminate cement clinker). This CSA binder is a hydraulic, cementitious mineral mixture rich in C4A3S- (calcium sulfoaluminate crystals) compound. When mixed with Portland cement and gypsum components, it produces a very early and strong cementitious matrix.

CSA adhesives are designed to be mixed with Portland cement and anhydrite/gypsum/α gypsum to make some dry-mix mortars. These mortars need to have fast setting, fast hardening, high strength, frost resistance, impermeability, corrosion resistance, low PH, low dry shrinkage and micro expansion characteristics. Even if the alumina content is high, the characteristics of rapid setting and high early strength development of this CSA binder are not related to CAC (high alumina cement). CAC is a refractory cement with a completely different microscopic crystal structure. When mixed with Portland cement, the CSA binder acts as a catalyst in the rapid hardening process or concrete. The more CSA used, the higher the early strength. However, a higher replacement dose will significantly reduce the setting time. All CSAs are essentially quick settings. In order to extend working hours, chemical retarders and accelerators are often used.

2. Advantages of using CSA adhesive
CSA adhesives can be used in combination with chemical additives, such as: polymers, whether in latex or redispersible powder form; defoamers; retarders; accelerators; plasticizers/superplasticizers; rheology modifiers. Advantages of using CSA adhesive: fast setting; adjustable curing time; high early strength; time to increase strength; minimal shrinkage; shrinkage compensation; expansion; sulfate resistance to reduce alkalinity; low carbon dioxide emissions; rheology adapted to the application and many more.

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