Can fly ash be used instead of cement?
Fly ash is used to lower the cost and to improve the performance of PCC. Typically, 15 percent to 30 percent of the portland cement is replaced with fly ash, with even higher percentages used for mass concrete placements. An equivalent or greater weight of fly ash is substituted for the cement removed.
Is fly ash cheaper than portland cement?
Fly ash and Slag will typically be 18% cheaper than Portland cement. When a mix includes 20% fly ash, this will provide savings of 3.5% in cost. The advantage of slag is its ability to substitute more of cement. Giving savings of up to 9% in cement cost with a 50% slag to cement content ratio.
Where do you get fly ash?
Where does fly ash come from? Fly ash is produced by coal-fired electric and steam generating plants. Typically, coal is pulverized and blown with air into the boiler’s combustion chamber where it immediately ignites, generating heat and producing a molten mineral residue.
Is fly ash stronger than cement?
Strength. The same qualities that cause fly ash to absorb moisture more easily than cement also make fly ash stronger. Concrete created with fly ash tends to be more stable and exhibit a higher grade of overall strength than concrete made with traditional cement products.
What is the cost of fly ash?
The traders can sell fine fly ash in retail in the domestic market at the rate of Rs 1,200 to 1,400 per tonne, while the reported international price of fly ash per tonne ranges from $70 to $ 130.
Which industry produces fly ash waste?
The fly ash waste is produced by thermal power industry. It is a coal combustion product which is composed of particulates which are driven out of coal-fired boilers along with flue gases.
Are flyash bricks strong?
The strength of fly ash brick manufactured with the above compositions is ranges between 7.5 MPa and 10 MPa. Fly ash bricks are lighter and stronger than clay bricks….The raw materials.
| Material | Mass |
|---|---|
| Portland Cement or Lime | 10% |