What is blast furnace slag cement used for?
Uses of Blast-Furnace Slag Cement Used for structures meant for water retaining such as retaining wall, rivers, ports, tunnels for improvement in impermeability. Used in mass concreting works such as dams, foundations which require low heat of hydration.
Which cement has blast furnace slag?
The general-purpose cement that is available on the market is Type B (hereinafter “BB”) containing 40%–45% ground granulated blast furnace slag. The qualities of ground granulated blast furnace slag (hereinafter “GGBFS”) are specified in JIS R 6206: Ground Granulated Blast Furnace Slags for Concrete.
Is blast furnace slag used to make cement?
Pelletized blast furnace slag has been used as lightweight aggregate and for cement manufacture. Foamed slag has been used as a lightweight aggregate for Portland cement concrete. Granulated blast furnace slag has been used as a raw material for cement production and as an aggregate and insulating material.
What are the methods of making blast furnace slag?
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 is the benefit of slag cement?
Slag concretes have improved long-term strengths even though their early strength development is lower than portland cement concretes. They also have lower permeability and improved durability. Slag cement generally costs less than portland cement.
Is slag good for concrete?
The use of slag in concrete has several benefits, including reduced energy, reduced greenhouse gas emissions, and reduced use of raw materials. – Granulated blast-furnace slag (GBFS)—The glassy granular material formed when molten blast-furnace slag is rapidly chilled, as by immersion in water.
Is slag a cement?
Slag cement is a hydraulic cement formed when granulated blast furnace slag (GGBFS) is ground to suitable fineness and is used to replace a portion of portland cement. Once the slag has been cooled and ground to a usable fineness it is stored and shipped to suppliers throughout the united states.
What is slag used in cement?
Slag cement is a hydraulic cement formed when granulated blast furnace slag (GGBFS) is ground to suitable fineness and is used to replace a portion of portland cement. Once the slag has been cooled and ground to a usable fineness it is stored and shipped to suppliers throughout the United States.
Is blast furnace slag toxic?
When SSRS compares with ground granulated blast furnace slag (GGBFS) from iron making, steel slag contains toxic ingredients such as nickel, cadmium, chromium and strontium. These compounds could be harmful not only for environment but also for human health [9,10].
What kind of cement is used in a blast furnace?
Portland blast furnace cement (simply called slag cement) refers to the hydraulic binding material ground by mixing Portland cement clinker, granular blast furnace slag, and appropriate amount of gypsum, code-named P • S. The mixed amount of granular blast furnace slag in cement is 20% ~ 70% by weight.
Can you use Portland cement with blast furnace slag?
A Portland cement mixed with a designated amount of ground granulated blast-furnace slag. The latent hydraulic property of the blast-furnace slag gives excellent long-term strength. Suppression of alkali-aggregate reaction (type B and C).
How does blast furnace cement affect the alkali reaction?
The beneficial effect of blast furnace slag on the alkali silicate reaction was reported in , and the effect has two parts: First, blast furnace slag cement has a denser pore structure than Portland cement, and this hampers different transport processes needed for alkali silica reaction.
What should magnesium oxide be in blast furnace cement?
According to Portland blast furnace slag Cement, Portland Pozzolana Cement, and Portland fly-ash Cement (GB1344-1999), the national standard, the content of magnesium oxide in clinker should not exceed 5.0%. If the stability of cement tested by autoclave method is qualified, the content of magnesium oxide can be extended to 6.0%.