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Fly Ash

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Product
Fly Ash
Form
Powder
Color
Light White
Main Raw Material
Concrete, Iron Aluminate
Grade
Industrial Grade
Usage
Plaster, Construction Industry
Melting Point
1136 C
Delivery Time
10-15 Days
Packaging Details
HDPE Woven Gunny Bags
Packaging Size
25 Kg / 50 Kg / 1 Ton
  •   Many cement-based products, including poured concrete, concrete blocks, and brick, can use fly ash powder as their primary ingredient.
  •   Fly ash powder is most frequently used in Portland cement concrete pavement.
  •   Additionally, fly ash is utilized in the creation of flowable fill.
  •   Reduced absorption of water and harsh chemicals is the main advantage.

Fly Ash

Fly Ash

Fly ash is a heterogeneous by-product material produced in the combustion process of coal used in power stations. It is a fine grey colored powder having spherical glassy particles that rise with the flue gases. As fly ash contains pozzolanic materials components which reach with lime to form cementitious materials. Thus Fly ash is used in concrete, mines, landfills, and dams.

Coal-fired electric and steam-generating plants generate fly ash. Typically, coal is pulverized and blown into the boiler's combustion chamber with air, where it immediately ignites, producing heat and a molten mineral residue. Heat is extracted from the boiler via boiler tubes, which cools the flue gas and causes the molten mineral residue to harden and form ash. Coarse ash particles, known as bottom ash or slag, settle at the bottom of the combustion chamber, while finer ash particles, known as fly ash, remain suspended in the flue gas. Fly ash is removed from the flue gas before being exhausted by particulate emissions control devices such as electrostatic precipitators or filter fabric baghouses.

In PCC applications, fly ash is most commonly used as a pozzolan. Pozzolans are siliceous or siliceous and aluminous materials that, when finely divided and in the presence of water, react with calcium hydroxide to produce cementitious compounds at average temperatures.

Chemical Composition of Fly Ash

The chemical composition of fly ash is determined by the type of coal used and the methods used for coal combustion. Fly ash is created when coal is burned in electric utility or industrial boilers. Coal-fired boilers are classified into four types: pulverized coal (PC), stoker-fired or traveling grate, cyclone, and fluidized-bed combustion (FBC). The PC boiler is the most common, particularly in large electric generating units. Other types of boilers are more commonly found in industrial or cogeneration facilities. This document does not take into account fly ashes produced by FBC boilers.

Fly ash chemical composition of various coals:

Component

Bituminous Coal

Sub-bituminous Coal

Lignite Coal

SiO2 (%)

20-60

40-60

15-45

Al2O3 (%)

5-35

20-30

20-25

Fe2O3 (%)

10-40

4-10

4-15

CaO (%)

1-12

5-30

15-40

LOI (%)

0-15

0-3

0-5

Characteristics of fly ash:

Fly ash is typically finer in particle size than portland cement and lime. Fly ash is made up of silt-sized particles that are generally spherical and range in size from 10 to 100 microns. These tiny glass spheres increase the fluidity and workability of new concrete. Fineness is an important property that contributes to fly ash's pozzolanic reactivity.

Depending on its chemical and mineral constituents, fly ash can range from tan to dark grey. Tan and light colors are often associated with a high lime content. The iron content is usually associated with a brownish color. High unburned carbon content is usually attributed to a dark grey to black color. The color of fly ash is usually very consistent across power plants and coal sources.

Classification of Fly Ash:

Fly ash is classified differently depending on the codes used. They're

  1. Type of Fly Ash as per IS Codes (IS 3812-1981)

    1. Grade I: This grade of fly ash is derived from bituminous coal with SiO2+Al2O3+Fe2O3 fractions greater than 70%.

    2. Grade II: This grade of fly ash is derived from lignite coal and contains more than 50% SiO2+Al2O3+Fe2O3

  2. Type of Fly Ash as per American Society for Testing and Materials (ASTM C618): ASTM has classified fly ash into three types based on the type of coal and the resulting chemical analysis.

    1. Type C: Type C fly ash is made from the combustion of lignite or sub-bituminous coals, contains more than 10% CaO, and has cementitious as well as pozzolanic properties.

    2. Type F: Type F fly ash, which is produced by the combustion of bituminous or anthracite coal, contains less than 10% CaO and has pozzolanic properties.

  3. Based on boiler operations, the type of fly ash

    1. Low temperature(LT) fly ash: When the combustion temperature falls below 900o C, it is produced.

    2. High temperature(HT) fly ash: It is produced when the combustion temperature falls below 1000o C.

Uses of Fly Ash:

The most common applications for fly ash are listed below.

  1. Used in the production of Portland cement.

  2. Typically used in the construction of embankments.

  3. As a soil stabilizer, it is used.

  4. Fly ash is also used in the manufacture of flowable fill.

  5. Filler mineral used in asphalt road laying to fill voids.

  6. Geopolymers contain fly ash as a component.

  7. Roller-compacted concrete dams use this material.

  8. Used in the production of fly ash bricks.

    1. Flyash acts as a catalyst when treated with silicon hydroxide.

Fly Ash Manufacturers in India:

In India, our company is the market leader in Fly Ash manufacturers and suppliers. We are a solutions-based company with strong technical capabilities and long-term sourcing agreements with multiple producers. We specialize in the trading of cementitious materials to construction companies, cement manufacturers, asbestos plants, ready-mix concrete manufacturers, and brick manufacturers. We are a dependable supplier of cementitious materials such as Fly Ash and GGBS-Ground Granulated Blast Furnace Slag.