Ground Granulated Blastfurnace Slag (GGBS) is a cementitious by-product of iron manufacture which is used to make durable concrete in combination with Portland Cement (OP). Since the beginning of the 20th century GGBS has been used in the United Kingdom and abroad as a constituent of concrete, normally as a proprietary blend with Portland cement.

GGBS complies with BS 6699. Certification of within mixer combinations is in accordance with BS 8500.

C11S		6 to 35% GGBS
C111A		36 to 65% GGBS
C111B		66 to 80% GGBS

For high Sulphate Resistance, BS8500 requires a minimum of 66% GGBS.

Features and Benefits:

• High resistance to chloride penetration
• Resistance to sulphate attack
• Protection against alkali silica reaction (ASR)
• Low risk of thermal cracking
• Consistent colour
• Improved workability
• Extended setting time giving longer working period, helping to avoid cold joints

Note:
GGBS extends the setting time of concrete. In summer months this can be used to advantage but allowances should be made for cold weather conditions.