Today, the main by-product of hot metal production is granulated slag After grinding to cement fineness it is used as a main constituent of cement or as a separate concrete addition.

slag cement or combinations of cement / have a high resistance to chemical attack, a low active content of alkalis and a low heat of hydration. Concrete made of slag cement or higher amounts a high durability as a result of the low capillary porosity, a higher capacity to bind chloride ions and a high electrolytic resistance.

These properties favour the use of slag cements in special fields of application, e.g. for waterproof basements, dams, marine structures, bridges, telecommunication towers and containment structures.

With the substitution of Portland cement clinker by in cement or concrete, the consumption of natural raw materials as well as energy demands of cement production and specifically CO2 emissions are significantly decreased.

 
 
 

chemical composition %

Unground granulated slag as well as air-cooled slag (ABS) can also be used as concrete aggregate and for road construction. With pumiced or pelletized slag it is possible to make lightweight aggregate for concrete 

Concrete made from blast furnace slag cement with a high proportion of granulated blast furnace slag ensures the stability and durability of the telecommunications tower in Düsseldorf.

4- Soil replacement

Steel slag was used to improve the engineering properties of clay soils. Lab and field experimental programs were developed to investigate the effect of adding different percentages of steel slag on plasticity, swelling, compressibility, shear strength, compaction.

The results of tests on the clay soil showed that as steel slag content increased, the soil dry density, plasticity, swelling potential, and cohesion intercept decreased and the angle of internal friction increased. See attached Report 3

3- Asphalt

The inherent properties of iron and steel slag make it an ideal aggregate for base and surfacing asphalt products (bitumen bound application of slag aggregates). However, as they all exhibit different characteristics the properties have to be matched to the requirements of the specific material type.

The properties are assessed in accordance with the requirements of the European standard EN 13043 (Aggregates for bituminous mixtures and surface treatments for roads, airfields and other trafficked areas), and the relevant national guidance documents.

In addition to the environmental benefits of reducing the need to quarry and the avoidance of unnecessary landfill (disposal), the use of slag aggregates can produce asphalt materials exhibiting superior properties to those manufactured with natural aggregate.

For instance, steel slag produces an aggregate that:
 
•is cubical in shape, providing excellent resistance to the formation of        ruts in surface course asphalt
• Is alkaline, providing a strong affinity to the bitumen binder, ensuring     long life of road surfaces
•Is hard – providing a durable material that will not wear away
•Resists polishing, providing a safe riding surfaces for the whole life of   the road

Steel slag asphalt can be used for surfacing domestic driveways as well as heavy industrial areas and the heaviest trafficked roads.

Asphalt

The inherent properties of iron and steel slag make it an ideal aggregate for base and surfacing asphalt products (bitumen bound application of slag aggregates). However, as they all exhibit different characteristics the properties have to be matched to the requirements of the specific material type.

The properties are assessed in accordance with the requirements of the European standard EN 13043 (Aggregates for bituminous mixtures and surface treatments for roads, airfields and other trafficked areas), and the relevant national guidance documents.

In addition to the environmental benefits of reducing the need to quarry and the avoidance of unnecessary landfill (disposal), the use of slag aggregates can produce asphalt materials exhibiting superior properties to those manufactured with natural aggregate.

For instance, steel slag produces an aggregate that:
 
•    Is cubical in shape, providing excellent resistance to the formation of ruts in surface course asphalt
•    Is alkaline, providing a strong affinity to the bitumen binder, ensuring long life of road surfaces
•    Is hard – providing a durable material that will not wear away
•    Resists polishing, providing a safe riding surfaces for the whole life of the road

Steel slag asphalt can be used for surfacing domestic driveways as well as heavy industrial areas and the heaviest trafficked roads.

Porous asphalt roads – safe and quiet

 

Close up of porous asphalt

Steel slag has proved to be an excellent material for porous asphalt surfaces. Porous asphalt is a bituminous bound mixture with carefully selected, homogenous aggregate grains with a fixed grain size distribution. It has over 20 % interconnecting voids. These voids absorb noise from the traffic and allow water to drain, reducing water “back spray” form the vehicles and risk of aquaplaning.  In addition, less water on the road means better tyre/road grip and less spray effects improve the driver’s visibility. Roads built with porous asphalt using steel slag are quiet, safe and long-lasting.

 

 

 

Slag in Base Roads

  • Because of its hydraulic property and the large bearing capacity it can provide, steelmaking slag is used as a road base course material. With high particle density and hardness, this slag has superior wear resistance and for this reason is used as an aggregate for asphalt concrete. In addition, due to its high angle of shearing resistance, high particle density, and large weight per unit volume, it is also used as a material for civil engineering works and as a ground improvement material (i.e., material for sand compaction piles).

 
 

Our Product

Size 0 ~ 4 MM

Size 10 ~ 25 MM

Size 4 ~ 10 MM

Size 14 ~ 25 MM

physical specification

1- Cement

 

What is the Slag?

Electric arc furnace slag is produced during the manufacture of crude steel by the electric arc furnace (EAF) process. In this process steel direct reduced iron and scrap with additions of fluxes (e.g., lime [stone] and/or dolomite) are heated to a liquid state by means of an electric current. During the melting process the fluxes combine with non-metallic scrap components and steel incompatible elements to form the liquid slag. As the slag has a lower density than steel, it floats on top of the molten bath of steel. The liquid slag is tapped at temperatures around 1600 °C and allowed to slowly air-cool forming crystalline slag

Slag is prepared for a wide range of applications - as building materials or fertilizers. Through recycling, a portion of the steel slag is reused in the blast furnace as calcium and iron bearing material.

 

Aggregates - general information

The aggregate standards contain additional requirements for blast furnace slag and steel slag with respect to volume stability. In general the properties of iron and steel slag aggregate are comparable with the properties of natural aggregate. For some specific uses slag is even superior to natural aggregate.

Slag aggregate can be used as a construction material in unbound applications (where the aggregate is not bound) as well as in bound applications (mixtures which contain binding agents like cements, bitumen or a substance that has binding properties in contact with water). Besides construction, slag aggregates have some specific uses like waste water treatment due to their absorbing properties for pollutants.

     Advantages of slag products

So far, no case of negative environmental impact by ferrous slag has been reported when slag was used strictly in accordance with the requirements of the relevant regulation(s).

The use of ferrous slag – crystalline or vitrified – instead of natural rocks such as limestone or granite not only saves the energy that may be required to mine natural aggregates, but also eliminates the negative impacts associated with mining such as effects on biodiversity or disruption of the landscape.

In the case of cement manufacture, the use of granulated slag instead of clinker reduces the overall process CO2-emissions as a result of fuel savings and avoidance of sintering limestone or other calcareous materials.

Calculations made by the German FEhS – Institute for Building Materials Research have shown that CO2-emissions were reduced by about 22 million tonnes in the cement industry (hence in the industry as a whole) in Europe in 2008, because of the use of 24 million tonnes of granulated slag.

Applications:

 

2- Concrete


 

 

 

 

 

 

 

 

 


       

 

The mineral aggregate is used in a number of commercial applications:

•    Agriculture - pH adjustment and plant available silicon
•    Acid mine drainage prevention, treatment and remediation
•    Soil stabilization and road base reclamation
•    Road base and sub-base
•    General construction engineered fill, embankment, and backfill
•    Sludge solidification and stabilization
•    Hazardous waste stabilization
•    Flowable fill and excavatable backfill
•    Cement and concrete
•    Asphalt

 

 

 

 

 

 

 

 

 

 

 

 

Others

Slag Sand
 

Fertilizer

The mineral aggregate is used in a number of commercial applications:

•    Agriculture - pH adjustment and plant available silicon
•    Acid mine drainage prevention, treatment and remediation
•    Soil stabilization and road base reclamation
•    Road base and sub-base
•    General construction engineered fill, embankment, and backfill
•    Sludge solidification and stabilization
•    Hazardous waste stabilization
•    Flowable fill and excavatable backfill
•    Cement and concrete
•    Asphalt

Both the metal and mineral composition of the aggregate provide environmental benefits which include

•    Enhanced crop yields, with reduced fertilizer and pesticide requirements in agricultural applications
•    Replacement of natural resources and associated damage to the environment
•    Significantly lowered CO2 emissions in steel making, construction and other applications
•    Nontoxic aggregate due to low leaching characteristics

 

 

 

 

 

Slag helps to build a better world by preventing the consumption of natural resources and also thanks to their low carbon footprint.

0.30 ~ 0.45

SIO2

T.Fe

Al2O3

MgO

MnO

Cr.

CaO

34 ~ 38

1 ~ 2 

6 ~ 8

16 ~ 20

22 ~ 26

6 ~ 8

1.68

0 ~ 4

Size(mm)

10 ~ 14

14 ~ 25

Coarse

0 ~ 90

4 ~ 10

1.80

1.96

1.70

2.06

Bulk Density 

   Ton/m3

Environment

 
© 2018 Contrasteel Company.All rights reserved
  • Facebook - Grey Circle
  • YouTube - Grey Circle
  • Instagram - Grey Circle

Phone :+201001636422 

Email : ekandil@ezzsteel.com.eg