Recons Group is leading channel partner of JSW - GGBS. We, at Recons Group, supply the raw material to various RMC Mega Infrastructure Projects and Builders.
Although normally designated as GGBS, it can also be referred to as Slag Cement. Being a by-product and waste using it effectively up to some extent serves as a step for a greener environment.
GGBS is used to make durable concrete structures in combination with ordinary Portland cement and/or other pozzolanic materials. GGBS has been widely used in Europe, and increasingly in the United States and in Asia (particularly in japan and Singapore) for its superiority in concrete durability, extending the lifespan of buildings from fifty years to a hundred years.
Two major uses of GGBS are in the production of quality-improved slag cement, namely Portland Blast furnace cement (PBFC) and high-slag blast-furnace cement (HSBFC), with GGBS content ranging typically from 30 to 70% and in the production of ready-mixed or site-batched durable concrete.
Concrete made with GGBS cement sets more slowly than concrete made with ordinary Portland cement, depending on the amount of GGBS in the cementitious material, but also continues to gain strength over a longer period in production conditions. This results in lower heat of hydration and lower temperature rises, and makes avoiding cold joints easier, but may also affect construction schedules where the quick settings is required.
Uses of JSW GGBS
Granulated Blast furnace Slag
- Better workability, making placing and compaction easier
- Lower early age temperature rise, reducing the risk of thermal cracking in large pores
- Elimination of the risk of damaging internal reactions such as ASR
- High resistance to chloride ingress, reducing the risk of reinforcement corrosion
- High resistance to attack by sulphate and other chemicals
- Considerable sustainability benefits
Ggbs is the by product from controlled process of Iron Proction from the house of the Recons Group.
What is GGBS?
Granulated Blast furnace Slag is the by - product obtained in the manufacture of pig Iron in blast furnaces at around 1400° to 1500°C in the molten form. The slag is obtained by rapidly chilling the molten ash from the furnace by means of chilled water and is ground about 400 m2/kg of fineness by using state of the art grinding mill to make GGBS. It is a non-metallic product consisting essentially of glass.
Applications of GGBS
GGBS is used to make durable concrete structures in combination with Ordinary Portland Cement and/or other pozzolanic materials. To improve the durability of structures, usage of GGBS along with OPC in concrete is recommended is BS 6699:1986, ASTM C989:1982, IS 456:2000 and GGBS to OPC in the range of 25-70% shall be added to manufacture Portland Slag Cement as per IS 455:1989.
- Reduction in heat of hydration and minimization of Thermal cracks.
- Permeability and surplus lime liberated during the hydration of portland cement are the root causes for deleterious effect on the concrete.
- Absorption of surplus lime released out of OPC to form in to secondary hydrated mineralogy.
- Pore refinement and grain refinement due to the secondary hydrated mineralogy, thus contributing for impermeability and enrichment of Transition zones.
- Impermeability is the foremost mechanism for making the concrete more durable and is best achieved by using GGBS.
- Reduction requirement of cement for same strength thus reduces the cost of concrete.
- IS 456:2000 recommends addition of more than 50% GGBS where Chloride is encountered along with Sulphates in place of SRC.