Basics of Concrete - Ground Granulated Blast Furnace Slag (GGBFS) Cement
History - While there are many uses of Slag in its many contemporary applications, the material itself is as old as the smelting process which produces it. As early as 1589, the Germans were making cannon balls cast from iron Slag. And records are available which indicate that cast iron Slag stones were used for masonry work in Europe of the 18th century. The history of slag use in road building dates back to the time of the Roman Empire, some 2000 years ago, when broken slag from the crude iron-making forges of that era were used in base construction. Even though Slag was demonstrating its versatility well before the 20th century, for a long time, its principle use in this country was as track ballast for the nation's railroads. As production grew, so did the need to find new applications. One that proved immediately valuable was in the building of military roads during World War I.
What is GGBFS – Simply put, GGBF Slag, or Slag is a glassy by-product of iron production that has cementitious properties similar to Portland cement.
We Want Results! - The result is a product that, which blended with Portland cement in various combinations, offers seven significant advantages over mixes containing 100% Portland cement.
These Advantages are:
- Higher 28 day compressive and flexural strength
- Reduced permeability and increased resistance to chlorides and other aggressive chemicals
- Improved workability/finishability/pumpability
- Increased resistance to alkali-silica reactions (ASR)
- Increased resistance to sulfate attack
- Reduced heat of hydration
- A whiter, brighter finished appearance