Where is Ggbs used?

Where is Ggbs used?

Two major uses of GGBS are in the production of quality-improved slag cement, namely Portland Blastfurnace 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.

What is OPC and Ggbs?

Ordinary portland cement (OPC) has been traditionally used in the construction of concrete silos in Ireland. However, the aggressive nature of the effluent produced by silage leads to severe degradation of the concrete. GGBS is a common addition to PC composites.

What is the difference between Ggbs and fly ash?

There is a wide variation in the chemical properties of fly ash and GGBS. Fly ash is low in calcium oxide content but rich in silica and alumina while GGBS is relatively high in calcium oxide. The combination of these two materials can be more beneficial when used as a stabilizing agent than using them individually.

How is Ggbs produced?

Production. GGBS is produced by grinding Granulated Blastfurnace Slag to a controlled fineness. There are a number of different methods of grinding granulated blastfurnace slag. Traditionally, standard ball mills have been used, but since the early 2000s the use of roller presses and vertical mills has increased.

What is the content of SiO2 in fly ash?

OF FLY ASH ON ASR MITIGATION Existing specifications (ASTM C618 and AASHTO M295) broadly characterize fly ashes on the basis of their bulk chemical composi- tion into Class F [SiO2 + Al2O3 (aluminum oxide) + Fe2O3 (iron III oxide) > 70%] and Class C fly ashes (SiO2 + Al2O3 + Fe2O3 content from 50% to 70%).

Is Ggbs a code?

The Indian code of practice IS:456 recommends use of minimum 25% good quality fly ash as per IS:3812 (Part 1) or minimum 50% G.G.B.S. in concrete, as part replacement of low alkali (less than 0.6% alkali as Na2O equivalent) OPC, for combating the probable alkali-silica reaction (ASR) in concrete, for hydro-electric …

How does Ggbs react with cement?

The GGBS particles get activated by the alkali present in the cement and form their own hydration products. Some of the hydration products of GGBS react with Portland cement again to form hydrates which tend to block the pores. This results in a cement paste with very fine gel pores.

What is Ggbs advantages?

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 effect of Ggbs in concrete?

Replacing Portland cement CEM I with GGBS reduces the temperature rise and helps to avoid early-age thermal cracking. The higher the percentage of GGBS, the lower the rate of reaction and consequently the slower the rate at which heat is developed.

What is GGBS and how is it made?

What is GGBS? GGBS (Ground Granulated Blast-furnace Slag) is a cementitious material whose main use is in concrete and is a by-product from the blast-furnaces used to make iron. Blast-furnaces operate at temperatures of about 1,500°C and are fed with a carefully controlled mixture of iron ore, coke and limestone.

What is ground granulated blast furnace slag (GGBS)?

What is Ground Granulated Blast Furnace Slag (GGBS)? The ground granulated blast furnace slag (GGBS) is a by-product of iron manufacturing which when added to concrete improves its properties such as workability, strength, and durability.

What are the advantages of GGBS over cement?

The color is more even and light. Lower chances of efflorescence. The maintenance and repair cost of structures is reduced thus increasing the life cycle of concrete structures. Unlike cement, Ground granulated blast furnace slag (GGBS) does not produce carbon dioxide, sulfur dioxide, or nitrogen oxides.

What does GGBS-HCWA stand for?

Optimization on the hybridization ratio of ground granulated blast furnace slag and high calcium wood ash (GGBS–HCWA) for the fabrication of geopolymer mortar