Fly ash brick (FAB) are building materials, specifically masonry units, containing Class C fly ash and water. Compressed at 4,000 psi and cured for 24 hours in a 150 °F (66 °C) steam bath , then toughened with an air entrainment agent, the bricks last for more than 100 freeze-thaw cycles. Owing to the high concentration of calcium oxide in class C fly ash, the brick can be described as "self-cementing". The manufacturing method is said to save energy, reduce mercury pollution, and costs 20% less than traditional clay brick manufacturing.

The raw materials

• The raw material that is used for fly ash brick are: Fly ash Sand/Stone dust Lime Gypsum Cement
• Fly ash
• Sand or Stone dust
• Lime
• Gypsum
• Cement

Advantages

• Due to high strength, practically no breakage during transport & use.
• Due to uniform size of bricks mortar required for joints & plaster reduces almost by 50%.
• Due to lower water penetration seepage of water through bricks is considerably reduced.
• Plaster of Paris / Gypsum Plaster can be directly applied on these bricks without a backing coat of plaster
• These bricks do not require soaking in water for 24 hours. Only sprinkling of water before use is enough.