GGBFS
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Author:Wikipedia
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Published time :2024-09-02
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Ground granulated blast-furnace slag (GGBS) is a fine powder obtained from quenching molten iron slag in water or steam, then drying and grinding it. GGBS forms calcium silicate hydrates upon contact with water, enhancing concrete's durability and strength. It is commonly used in Europe, the USA, and Asia, particularly in Japan and Singapore, for its superior durability in concrete structures. GGBS reduces the risk of damage from alkali–silica reaction, chloride ingress, and sulfate attacks, and it also lowers the heat of hydration, making it suitable for large concrete pours. Additionally, GGBS contributes to sustainability by being a by-product of steel manufacturing, which is recognized by LEED and other environmental assessment methods.
The optimum dosage of Ground granulated blast-furnace slag (GGBS) for replacement in concrete was reported to be 20-30% by mass to provide higher compressive strength compared to the concrete made with only cement.[2]
Sustainability
[edit]Since GGBS is a by-product of steel manufacturing process, its use in concrete is recognized by LEED, as well as Building Environmental Assessment Method (BEAM) Plus in Hong Kong, etc. as improving the sustainability of the project and will therefore add points towards LEED and BEAM Plus certifications. In this respect, GGBS can also be used for superstructure in addition to the cases where the concrete is in contact with chlorides and sulfates — provided that the slower setting time for casting of the superstructure is justified.
