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1. Class F Fly Ash:

Source: Produced from the burning of anthracite or bituminous coal.

Chemical Composition: Contains less than 20% lime (CaO), with a combined silica, alumina, and iron oxide content of at least 70%.

Characteristics:

Pozzolanic Properties: Reacts with calcium hydroxide in the presence of water to form compounds with cementitious properties.

Lower Calcium Content: Results in lower early strength but better long-term strength and durability.

Applications: Suitable for use in high-strength concrete, mass concrete, and applications requiring resistance to sulfate attack and mitigation of alkali-silica reaction (ASR).

2. Class C Fly Ash:

Source: Produced from the burning of lignite or sub-bituminous coal.

Chemical Composition: Contains more than 20% lime (CaO), with a combined silica, alumina, and iron oxide content of at least 50%.