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fly ash,silicafume,blast furnace etc

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Shaheryar Khan

This document discusses different types of mineral admixtures that can be used in concrete, including fly ash, blast furnace slag, silica fume, rice husk ash, and volcanic ash. Mineral admixtures are fine ground materials like fly ash, silica fume, and slag that are either pozzolanic, cementitious, or both. Fly ash is a byproduct of coal combustion in power plants that reduces the heat of hydration in concrete. Blast furnace slag is prepared through metallurgical processes and reacts with cement. Silica fume is produced from silicon metal production and increases concrete strength and durability. Rice husk ash comes in black or white forms and increases cement strength and

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fly ash,silicafume,blast furnace etc
Mubashir shaheryar Roll no#15 Section A Assignment# 1 Mineral Admixtures; Silica Fume, Fly ash ; Blast Furnace Slag, Rice husk ash; Volcanic ash
MINERAL ADMIXTURES Mineral admixtures are fine grinded materials like fly ash, silica fume, slag etc. The mineral admixtures are: Pozzolanic (Low-calcium ) -Cementitious (Granulated iron blast-furnace slag) -Both pozzolanic and cementitious (Highcalcium) -Natural materials (Volcanic Ash)
FLY ASH DEFINITION: Fly ash is a by-product of the combustion of coal in thermal power plants. The dust system removes the fly ash,as a fine residue, from the combustion gases before they are discharged into the atmosphere. EFFECT ON HEAT OF HYDRATION: Replacement of cement by fly ash results in a reduction in the temperature rise in fresh Concrete. This is particular importance in mass concrete where cooling, following a large temperature rise, can lead to cracking
BLAST FURNACE SLAG PREPARATION: Blast furnace slag is basically prepared in blast furnace by metallurgical process in which iron ore ,coke, flux [limestone or dolomite] is added.In slag formation lime in the flux chemically reacted with aluminates and silicates present in ore to a non metallic product called blast furnace slag.
fly ash,silicafume,blast furnace etc
SILICON FUME DEFINITION: silicon fume is by product of producing silicon metal.It is produced in electric arc furnace. USES: It is used in concrete to increase its strength and durability.It is very reactive form of pozzolan.
fly ash,silicafume,blast furnace etc
RICE HUSK ASH Rice husk ash is a pozzolanic material.It gives strenght to cement and increases the durability of concrete.Rice husk ash has different form black ,white.Black rice husk ash is formed by incomplete combustion of carbon while white rice husk ash is formed by complete combustion of carbon.
VOLCANIC ASH DEFINITION: It is very small solid particles ejected from volcano during the blast which have intermediate axes 2mm or less. USES: It is used in making portland cement by mixing with quicklime . Volcanic ash is used as admixture in concrete and cement
fly ash,silicafume,blast furnace etc
fly ash,silicafume,blast furnace etc

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fly ash,silicafume,blast furnace etc

  • 2. Mubashir shaheryar Roll no#15 Section A Assignment# 1 Mineral Admixtures; Silica Fume, Fly ash ; Blast Furnace Slag, Rice husk ash; Volcanic ash
  • 3. MINERAL ADMIXTURES Mineral admixtures are fine grinded materials like fly ash, silica fume, slag etc. The mineral admixtures are: Pozzolanic (Low-calcium ) -Cementitious (Granulated iron blast-furnace slag) -Both pozzolanic and cementitious (Highcalcium) -Natural materials (Volcanic Ash)
  • 4. FLY ASH DEFINITION: Fly ash is a by-product of the combustion of coal in thermal power plants. The dust system removes the fly ash,as a fine residue, from the combustion gases before they are discharged into the atmosphere. EFFECT ON HEAT OF HYDRATION: Replacement of cement by fly ash results in a reduction in the temperature rise in fresh Concrete. This is particular importance in mass concrete where cooling, following a large temperature rise, can lead to cracking
  • 5. BLAST FURNACE SLAG PREPARATION: Blast furnace slag is basically prepared in blast furnace by metallurgical process in which iron ore ,coke, flux [limestone or dolomite] is added.In slag formation lime in the flux chemically reacted with aluminates and silicates present in ore to a non metallic product called blast furnace slag.
  • 7. SILICON FUME DEFINITION: silicon fume is by product of producing silicon metal.It is produced in electric arc furnace. USES: It is used in concrete to increase its strength and durability.It is very reactive form of pozzolan.
  • 9. RICE HUSK ASH Rice husk ash is a pozzolanic material.It gives strenght to cement and increases the durability of concrete.Rice husk ash has different form black ,white.Black rice husk ash is formed by incomplete combustion of carbon while white rice husk ash is formed by complete combustion of carbon.
  • 10. VOLCANIC ASH DEFINITION: It is very small solid particles ejected from volcano during the blast which have intermediate axes 2mm or less. USES: It is used in making portland cement by mixing with quicklime . Volcanic ash is used as admixture in concrete and cement