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Fly ash is a fine powder that is a byproduct of burning pulverized coal in electric generation power plants. Fly ash is a pozzolan, a substance containing aluminous and siliceous material that forms cement in the presence of water. When mixed with lime and water, fly ash forms a compound similar to Portland cement.
Two classes of fly ash are defined by ASTM C618: Class F fly ash and Class C fly ash. The chief difference between these classes is the amount of calcium, silica, alumina, and iron content in the ash.
Fly ash can be used as prime material in many cement-based products, such as poured concrete, concrete block, and brick. One of the most common uses of fly ash is in Portland cement concrete pavement or PCC pavement.
Fly ash reacts with lime in the presence of moisture to form calcium silicate hydrate which is the binder material. The raw mix is molded in the molding press/machine, pressed under a pressure into bricks. The bricks are then with drawn from the molding machine and they are air dried under the sun and kept for 1 day.
Fly ash bricks are hi-tech well-improved quality bricks used for construction of brick masonry structures. They are used as replacement for normal clay bricks and has better properties than it. Fly ash bricks competitive in comparison to the conventional clay bricks and provide enormous indirect benefits.
Fly ash concrete has better workability and pumpability. It also hydrates more slowly, which reduces the heat of hydration—critical to reducing cracking in mass concrete placements. All of this makes fly ash concrete more durable than plain portland cement concrete. In addition, concrete with fly ash costs less, because fly ash is typically cheaper than cement.
Fly ash is commonly used in concrete in replacements that are ranging from 0 to 30% by mass of total cementitious material. A high percentage of the cement within concrete can be replaced by Fly Ash without adversely affecting concrete properties.
BHARATMACH (BHARAT Hydraulic) block making machines are designed to make Hydraulic Technology OR Vibro-pressed hollow blocks, Fly Ash Bricks, interlocking blocks, pavers, a variety of special products and custom made-designs. BHARATMACH interchangeable moulds are designed to meet any customers need and specifications.
1. Same number of Fly Ash Bricks will cover more area than clay bricks. Fly Ash Bricks have High Fire Insulation. 2. Due to high strength of Fly Ash Bricks, practically no breakage during transport of Fly Ash Bricks and use. 3. Due to uniform size of Fly Ash Bricks mortar required for joints and plaster requirement reduces almost by 50%. 4. Due to lower water penetration seepage of water through bricks is considerably reduced. 5. Gypsum plaster can be directly applied on these Fly Ash Bricks without a backing coat of lime plaster. 6. These Fly Ash Bricks do not require soaking in water for 24 hours. Sprinkling of water before use is enough.