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GGBS is used as a direct replacement for ordinary cement, and replaces ordinary cement on a one-to-one basis by weight.
Replacement rates for GGBS vary from 30% to up to 85%. Typically 50% is used in most instances. Higher replacement rates up to 85% are used in specialist applications such as in aggressive environments and to reduce heat of hydration. GGBS can be used at replacement levels of 70% in lean mix concrete.
TYPICAL SPECIFICATIONS(Chemical and Physical):
SiO2 37%
CaO 33.6%
MgO 8.2%
Al2O3 17.9%
LOI 0.4%-3%
Insoluble Residue 1.2-2.2%
MnO 0.20 %-2%
Alkalies 0.2%
Suphide sulphur 0.3%- 2%
Sulphate content as So3 0.19- 2.50 %
Glass Content 67-98%
Fineness cm2/gm 3800-4000
Compressive Strength (N/mm2)
After 7 days 12-26%
After 28 days 32-45%
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