Introduction to Alkali activator

2022-11-16
Introduction to Alkali activator

Keywords
Alkali activator, Alkali activated gelling material, Catalyst, concrete

Alkali activator is a professional term for alkali-activated gelling materials, and it is called a catalyst in chemistry.  Generally refers to caustic alkali, silicate, aluminate, phosphate, sulfate, carbonate and other substances containing alkaline elements.

Catalytic principle of base activator
The alkali activator catalyzes the hydration of the gelling material and accelerates the hydration reaction of the gelling material.
The alkali activator contains a large amount of hydroxide ions. During the hydration process of cement, a certain alkaline environment can provide enough hydroxide ions for the cement to quickly form C-S-H gel, so that the cement can quickly set and harden to form a certain strength.  the matrix.

Types of base activators
Calcium hydroxide, sodium hydroxide, sodium sulfate, calcium sulfate, sodium carbonate, water glass, etc.;

base activated material
Metakaolin, fly ash, slag, etc.;

Application range of alkaline activator
Slag cement, UHPC, recycled concrete, fly ash cementitious materials, etc.
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