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Reactivity Index and Strength Development of High Strength Concrete with GGBFS Cement

The slag cement industry in Indonesia is growing in
tandem with the smelter industry as a supplier of slag material.
The use of slag cement instead of ordinary cement can reduce
CO2 emissions. This research aimed to design the mixture
composition of slag cement and ordinary cement for highstrength concrete. Standard concrete cylinders and concrete
beams were tested to gain the compressive, tensile and flexural
strength. The testing results indicate that generally, the concrete
mixture compositions of low GGBFS (25%) gained their
optimum strength at the age of 28 days while concrete with high
composition of GGBFS (55%) achievedsimilar strength at the age
of 90 days.A mixture using higher percentage replacement of
GGBFS might attain its optimum strength at the longer ages. The
use of Silica Fume (SF) in high-strength concrete mixtures with
GGBFS found ineffective to increasethe concrete strength as the
results indicate that concretes with SF have lower strength
compared with non-SF concrete mixtures.