Fly Ash

Class F Fly Ash – Powdered

Fly ash is a heterogeneous by-product material produced in the combustion process of coal used in power stations. These micron-sized earth elements consist primarily of silica, alumina and iron. It is fine grey colored powder having spherical glassy particles allowing them to flow and blend freely in mixtures. This makes fly ash a desirable admixture for concrete.

Benefits of Fly Ash

Better work ability
Increase long term strength
Reduces permeability
Reduces heat of hydration
Improves sulfate & chloride resistance
Reduces risk of alkali aggregate reaction
Better concrete finish
Reduces shrinkage

Fly Ash Uses

Major uses of fly ash are:

In the manufacture of Portland cement
In the manufacture of fly ash bricks
For embankment construction
As a soil stabilization material
As a component in the production of flowable fills
As the filler mineral in asphalt road laying to fill the voids
As a component in geo-polymers
In roller compacted concrete dams
Acts as a catalyst when treated with silicon hydroxide

Fly Ash Composition

Parameters	Method	Results
Fineness (Retained on 4.5 microns)	ASTM C-311/311 M-16	10.18%
Free Calcium (CaO)	ASTM C-311/C-114	0.58%
Insoluble Residue (I.R)	ASTM C-311/C-114	63.96%
Moisture	ASTM C-311/C-114	0.24%
Unburned Carbon	ASTM D 5373 / Gravimetric	6.14%
Manganese Oxide (MnO2)	ICP-OES	0.06%
Phosphorous Pentoxide (P2O5)	ICP-OES	0.66%
Titanium Oxide (TiO2)	ICP-OES	1.48%
Bulk Density (Loose)	Gravimetric	0.79%
Alumina Oxide (Al2O3)	ASTM C-311/C-114	27.61%
Calcium Oxide (CaO)	ASTM C-311/C-114	7.36%
Iron Oxide (Fe2O3)	ASTM C-311/C-114	4.55%
Loss on Ignition (L.O.I)	ASTM C-311/C-114	7.80%