Why blast furnace slag is used in cement?

In most projects BFC is now specified in structural concrete for bridge piers and abutments for protection against chloride attack. BFC is also routinely used to limit the temperature rise in large concrete pours. The more gradual hydration of BFC generates both lower peak and less total heat than Portland cement.

Does slag increase strength?

How Does Slag Cement Improve Strength? Slag cement increases the compressive and flexural strength of conventional concrete (Figures 1 and 2) and is often a vital component in producing high strength concrete.

What is the purpose of slag?

Slag floats on the surface of the molten metal, protecting it from oxidation by the atmosphere and keeping it clean. Slag forms a coarse aggregate used in certain concretes; it is used as a road material and ballast and as a source of available phosphate fertilizer.

Where does blast furnace slag come from?

Blast furnace slag (BFS) is a by-product from iron production in blast furnaces, which are fed by a mixture of iron-ore, coke and limestone. In the process, the iron ore is reduced to iron while all remaining materials form the slag, which is tapped off as a molten liquid and cooled.

What fuel is used in a blast furnace?

Blast furnace gas. The rest is mostly carbon monoxide, which has a fairly low heating value already and some (2-4\%) hydrogen. It is commonly used as a fuel within the steel works, but it can be used in boilers and power plants equipped to burn it. It may be combined with natural gas or coke oven gas before combustion or a flame support…

What can blast furnace waste slag be used for?

In general, it is used to produce Pig iron from its ore. It is used in process plants. The slag of the blast furnace has hydraulic properties which are used in cement as a additives Slag also helps in soil stabilization.

What is the blast furnace process?

Blast furnace, a vertical shaft furnace that produces liquid metals by the reaction of a flow of air introduced under pressure into the bottom of the furnace with a mixture of metallic ore, coke, and flux fed into the top.

What does blast Furnance mean?

Definition of blast furnace. : a furnace in which combustion is forced by a current of air under pressure; especially : one for the reduction of iron ore.