FLY ASH, a wealthy waste!

Fly ash is fine glass-like powder recovered from gases created by coal fired during electric power generation at power plants.

Fly ash is a burnt and powdery derivative of inorganic mineral matter that generates during the combustion of pulverized coal in the thermal power plant. The burnt ash of the coal contains mostly silica, alumina, calcium, iron are the major chemical constituents. Depends on the burning temperature of coal.

Fly Ash

In the past, fly ash was generally released into the atmosphere, but air pollution control standards now require that it be captured prior to release by fitting pollution control equipment.

In the case that fly (or bottom) ash is not produced from coal, for example when solid waste is incinerated in a waste-to-energy facility to produce electricity, the ash may contain higher levels of contaminants than coal ash. In that case the ash produced is often classified as hazardous waste.

Size & Shape
  • Fly ash is typically finer than Portland cement and lime.
  • Consists of spherical particles, size of which ranges between 10 and 100 microns.
  • These small glass particles improve the fluidity and movability of fresh concrete.
  • Fineness is one of the important properties contributing to pozzolanic reactivity of fly ash.
  • Fly ash can be tan to dark grey depending on its mineral and chemical constituents
  • Fly ash quality is affected by its fuel characteristics (coal), usually is very consistent to the source of coal
  • The different shades are a result of the amount of content of lime, iron and other such chemical / mineral contents
  • Fly ash contains primarily of oxides of silicon, alluminium, iron and calcium.
  • Magnesium, potassium, sodium, titanium and sulfur are also present on a lesser degree
  • Fly ash contains primarily of oxides of silicon, alluminium, iron and calcium.
  • When used as a mineral admixture in concrete, Fly ash is classified as either Class C or Class F
  • The chemistry depends on the type of coal burnt in boiler, temperature of furnace, degree of pulverization of coal
Fly Ash Uses
  • Manufacturing of fly-ash bricks
  • Used in Asphalt pavement
  • Manufacturing of fly-ash block.
  • Manufacturing of asbestos sheets.
  • Manufacturing of asbestos pressure pipes.
  • Used in Flow able Fill
  • Used in Structural Fills/Embankments
  • Manufacturing of Pozzolan Portland Cement.
Why Fly Ash
  • Increasing the life of concrete roads and structures by improving concrete durability.
  • Net reduction of energy use & of adverse air emissions when replaced / displaced by manufactured cement. Reduction in amount of coal combustion
  • products that must be disposed in landfills otherwise.
  • Conservation of other natural sources & materials.
  • The consistency and abundance of fly ash in many areas present unique opportunities for use in structural fills.
Why Fly Ash
  • Its key advantages include reduced heat of hydration, improved workability, enhanced durability and longer setting time.
  • It is also suited for mass concrete applications, and in hot and aggressive environments where early-age thermal cracking and durability are major concerns
  • Fly Ash use in concrete qualifies for credit under the U.S. Green Building Council’s popular LEED® rating system for sustainable construction
  • A Pozzolans ensure the setting of concrete and plaster and provide concrete with more protection from wet conditions and chemical attack.
  • The service life of structures using Fly Ash is enhanced by more than 100% on account of superior durability of concrete.
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