What is the name of ash, as per IS 3812 (Part 1) : 2013, which is prepared from fly ash or bottom ash or both mixed in any proportion and conveyed or carried in dry form and deposited dry?
What is the name of ash, as per IS 3812 (Part 1) : 2013, which is prepared from fly ash or bottom ash or both mixed in any proportion and conveyed or carried in dry form and deposited dry? Correct Answer Mound ash
Concepts:
Pulverized fuel ash is the ash generated by burning of ground or pulverized or crushed coal or lignite fired boilers. It can be fly ash, bottom ash, pond ash or mound ash.
As per IS 3812 (Part 1): 2013, these ashes are defined following ways:
1. Fly ash: Pulverized fuel ash extracted from flue gases by any suitable process such as by cyclone separator or electro-static precipitator.
2. Bottom Ash — Pulverized fuel ash collected from the bottom of boilers by any suitable process.
3. Mound Ash — Fly ash or bottom ash or both mixed in any proportion and conveyed or carried in dry form and deposited dry.
4. Pond Ash — Fly ash or bottom ash or both mixed in any proportion and conveyed in the form of water slurry and deposited in pond or lagoon.
Apart from there are two more types of fly ashes which are given below:
Calcareous Fly Ash — Fly ash having reactive calcium oxide not less than 10 percent by mass. Such fly ash is normally produced from burning lignite or sub-bituminous coal and has both pozzolanic and hydraulic properties.
Siliceous Fly Ash — Fly ash having reactive calcium oxide less than 10 percent, by mass. Such fly ash is normally produced from burning anthracite or bituminous coal and has pozzolanic properties only.