Why the PSC is eco friendly cement?

Production of slag cement creates a value-added product from a material—blast furnace slag.It also reduces air emissions at steel plants through the granulation process. Use of slag cement in concrete reduces the environmental impact of concrete by:

  • Replacing the Portland cement by Slag helps in reducing CO2 emissions and in conserving non-renewable resources of lime stone.
  • Reducing energy consumption, since a ton of slag cement requires nearly 90% less energy to produce than a ton of Portland cement.
  • Reducing the amount of virgin material extracted to make concrete.
  • Reducing the “urban heat island” effect by making concrete lighter in color thus reflecting more light and cooling structures and pavements with exposed concrete.

What are the advantages of PSC?

PSC has the advantages both in the fresh and hardened properties of concrete.

  • Improved workability and cohesiveness of the mix.
  • Reduced heat of hydration and thermal cracks.
  • Reduced plastic shrinkage cracks.
  • Smooth surface finish.
  • Increased resistance to chlorides, sulphates, carbon dioxide and such other harmful salts.
  • Higher ultimate compressive and flexural strength.
  • Higher impermeability.
  • Increased resistance to Alkali – silica reaction
  • Durable and Sustainable Construction.

What is setting of cement?

When water is mixed with cement, the paste formed remains plastic for a certain time. During this period, it is possible to mould it into any desired shape. As the reaction between water and cement continues, the paste loses its plasticity. This early period in the hardening of cement is referred to as Setting of cement. The BIS has specified the Initial Setting time should not be less than 30 minutes and Final Setting time should not exceed 600 minutes.

Why the quality of Slag is more stable than Fly Ash?

The stability of raw material: The raw material for GGBS, raw slag, is usually obtained from the predetermined steel plant, which ensures the stability of the raw material.

The stability of the chemical compositions: Due to the stringent quality control in producing iron and steel, the steel plant imposes strict control in the usage ratio of all materials in the iron production process. Therefore, the stability of the chemical compositions of its by-product – raw slag is under control.

With the use of the state-of-art vertical mill installed by JSW to process raw slag, the fineness of GGBS can be controlled, and therefore consistency in quality is attainable.

PFA that is collected using average techniques usually does not have the above-mentioned characteristics, and therefore presents a higher fluctuation in quality.

What are the differences of the GGBS produced by different technologies?

As compared to the traditional ball mill, the GGBS produced from the modern vertical mill has the following characteristics:

  • — High fineness, good particle size distribution, the GGBS activeness could be fully developed
  • — High activity index, small variation in the quality
  • — The product has low energy consumption, high production efficiency

What is Ground Granulated Blast Furnace Slag? How is it produced?

GGBS (also known as GGBS or GGBFS) is manufactured from blast furnace slag, a by-product from the manufacture of iron. It is obtained by quenching molten iron blast furnace slag immediately in water or stream, to produce a glassy granular product that is then dried and ground into a fine powder (GGBS). It is an excellent binder to produce high performance cement and concrete.