We supply good quality dry fly ash with carbon content loi (loss on ignition) less than 4%. benefits of fly ash use in concrete and cement bricks blocks: 1. Resistance to sulphate attack and chloride attack. 2. Resistance to alkali silica reaction. 3. Reduction in water demand. 4. Reduced bleeding due to high fineness of cement. 5. Pore refinement leading to improved density of concrete. 6. Low heat of hydration.