FLY-ASH BRICKS AS A BUILDING MATERIAL.

INTRODUCTION

Fly ash bricks are a building material. As per its name it is mainly made by the fly-ash which is generated in thermal power stations. It is a by product from coal combustion to generate electricity or other things. In modern coal-fired power plants, fly ash is generally captured by electrostatic precipitators or other particle filtration equipment before the flue gases reach the chimneys. Together with bottom ash removed from the bottom of the boiler, it is known as coal ash. the chemical composition of fly-ash bricks are silicon dioxide, aluminium oxide, calcium oxide and iron oxide.

Fly ash brick - Wikipedia

Raw materials :


  • Fly ash – which is the primary ingredient
  • Stone dust – as fine aggregate
  • Lime – source of calcium carbonate which results in the bricks being called “Self-cementing bricks”.
  • Gypsum – to enhance the fineness of the shape of the bricks
  • Cement – to increase bonding and strength




Manufacturing process :

Manufacturing of fly-ash bricks require fly-ash, stone dust, cement and water to be mixed in suitable proportion. First fly-ash and sand stone dust are mixed in pan and then cement is added to pan mixture to get uniform dry mixture. Afterwards water is added to this dry mixture and rotating till mixture get mixed well.
This uniformly mixed mixture transfer into the moulding machine where it is pressed hydraulically or compacted by vibrator to remove excess air from it and make a dense product.
Once the bricks are taken out from the mould then they are air dried for 2 days. Water curing is then done for next 14 days to achieve required strength. After curing, they will be dried in sunlight for next 14 days.
It is observed in some places where lime and gypsum is not easily available there cost of lime increases the whole cost of brick hence they don't use lime and gypsum. It will not majorly effect on strength of bricks.

Fly ash bricks are used for the construction of various types of buildings such as:


  • Factories
  • Warehouses
  • Power plants
  • Houses
  • Industries
  • High rise structures

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