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Iron & Steel
Spone Iron
(High | Low) Carbon Content
Semi Finished Steel
Steel Billet | Bloom | Slab
Finished Steel
Rebar | Wirerod
Bitumen
Bitumen
Penetration Grade Bitumen | Viscosity Grade (VG) Bitumen | Performance Grade (PG) Bitumen | Polymer Modified Bitumen (PMB) | Bitumen Emulsion | Oxidized Bitumen | Cutback Bitumen
Minerals
Cement & Clinker
Clinker
Type I - II - V | Low Alkali
Cement
Type I - II  - IV - V
White Clinker
42.5 | 52.5
White Cement
42.5 R | 42.5 N
Blast Furnace Slag
GGBFS | GBFS
Petrochemicals

Blast Furnace Slag Cement (Application, Pros & Cons)

Blast Furnace Slag (BFS) cement is the combination of Ordinary Portland Cement (OPC) and fine Granulated Blast Furnace Slag (GBFS) gained as a byproduct in the steel making manufacturer with below 70% to that of cement. Ground Granulated Blast Furnace Slag (GGBFS) is a fine glassy granule which encompasses cementitious possessions.

GGBFS is gained as a derivative in the removal of iron from its ore. The procedure of removal of iron is the blast furnace. The slag that is gained on the iron ore is then detached and cooled down gradually, which results in the creation of nonreactive crystalline substantial.

 

blast furnace slag

Fig 1: Extraction of molten Slag from Blast Furnace.

 

Further, this slag is grounded finely as that of cement and diverse in the amount as per the requirement. Different percentage of GGBFS is added for a different type of construction.

 

Uses of Blast-Furnace Slag Cement 

  1. In ready mix concrete plants.
  2. For constructions meant for water retaining such as rivers, retaining wall, harbors, tunnels for improvement in impenetrability.
  3. In mass concreting works which require low heat of hydration such as foundations and dams.
  4. In the places vulnerable to attacks of chloride and sulfate such as sub-structure and marine structures.

 

Advantages of Blast-Furnace Slag Cement 

  1. The initial strength achieved is less than the conventional concrete, but the superior ultimate strength attained is equivalent and sometimes higher than conventional concrete.
  2. As the slag is finely grounded, it has the valence to fill the pores efficiently, workability is high and bleeding is low.
  3. It has good persistence towards sulfate and chloride assault and even less risk of alkali-silica response with aggregates.
  4. Because of the deliberate hydration procedure, the slump retention and initial setting time are further.
  5. Greater persistence and reduced penetrance due to fineness.
  6. Due to the white color of GGBFS, the cement color obtained is brighter colored when compared to conventional cement.
  7. The production cost of this cement is less than the Ordinary Portland Cement (OPC).

 

Disadvantages of Blast-Furnace Slag Cement 

  1. Early Strength is low; therefore, it cannot be used in Reinforced Cement Concrete (RCC) works.
  2. As the initial setting time is high, this cement is not used for emergency or repair works.

 

 

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