- Source: Produced from the combustion of younger lignite or sub- bituminous coals.
- Composition: Contains a high percentage of calcium oxide (CaO), typically more than 20%. It also includes silica, alumina, and iron oxide.
- Properties: Exhibits both pozzolanic and self-cementing properties. The high lime content allows it to harden and gain strength independently when mixed with water.
- Key uses: Used in concrete when early-stage strength development is needed. Its self-cementing properties can allow for a partial replacement of cement in a concrete mix.
- Source: Derived from the combustion of harder, older anthracite or bituminous coals.
- Composition: Primarily composed of silica (silicon dioxide, SiO2), alumina (aluminum oxide, Al2O3), and iron oxide (Fe2O3). It has a low calcium content, typically less than 10%.
- Properties: Possesses pozzolanic properties, meaning it requires a cementing agent like hydrated lime or Portland cement to react with water and form a cementitious compound. It has no self-cementing properties on its own.
- Key uses: Used in concrete to increase its long-term strength, reduce permeability, and enhance resistance to sulfate attacks.
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