Why is Ggbs used in concrete?
Durability; GGBS reduces the likelihood of concrete thermal cracking, and it improves concrete’s resistance to damage from alkali-silica reaction, sulphates and chlorides. Concrete in aggressive environments is much more durable with the use of GGBS as a partial replacement for the cement.
What is the difference between slag and fly ash?
See the diagram below: Another difference between slag and fly ash is that while fly ash will rarely surpass 35% of the cement content, slag can substitute 50% of the cement content, or even higher for different applications. Fly ash and Slag will typically be 18% cheaper than Portland cement.
What is meant by Ggbs in concrete?
Ground-granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.
Is fly ash based cement good?
If we use fly ash up to a maximum of 35 per cent (the rest being clinker, the raw material that contains limestone), the cement behaves much better. ppc is much more durable and has high resistance to cracks,” stresses Shiban Raina, director-general, National Council for Cement and Building Materials (ncb).
What is Ggbs list its advantages?
What is the advantage of using GGBS as replacement of cement in concrete? From structural point of view, GGBS replacement enhances lower heat of hydration, higher durability and higher resistance to sulphate and chloride attack when compared with normal ordinary concrete.
Which is better fly ash or slag?
Slag cement is a more uniform product than fly ash. As a result, concrete made with slag cement will generally have more uniform properties than concrete made with fly ash.
Where is Ggbs used?
GGBS is mainly used as a partial replacement of cement in concrete. When added as an admixture to concrete, it acts as a stabilising agent and improves the quality of concrete. In the production of ready-mixed concrete, GGBS replaces a substantial portion of the Portland cement component, generally about 60-70%.
When to use GGBS instead of fly ash?
Further, in the second phase of study, fly ash is replaced partially by GGBS (up to 20% by weight). Compressive strength and transport properties such as chloride permeability and sorptivity are investigated up to 90 days. The results obtained are also compared with that of conventional concrete with similar compressive strength at 28 days.
How is fly ash based alkali activated concrete developed?
Fly ash-based alkali-activated concrete has been developed using the Taguchi method. Effect of adding GGBS on compressive strength and microstructural of fly ash-based alkali-activated concrete. Sorptivity and permeability testing on fly ash-based alkali-activated concrete.
Why is slag added to fly ash geopolymer?
Therefore, it can be believed that the addition of slag in fly ash based geopolymer, when cured at ambient conditions, can enhance the mechanical properties in terms of early and later age compressive strengths but on the contrary, it also forms a weak matrix with porous media that can deteriorate its durability potential.
What are the advantages and disadvantages of GGBS?
The incorporation of ground granulated blast furnace slag (GGBS) in concrete manufacture gains many advantages which are mentioned below. Ground granulated blast furnace slag (GGBS) in concrete increases the strength and durability of the concrete structure. It reduces voids in concrete hence decreasing permeability.
