Is the addition of 5% to 15% Limestone interground with quality clinker detremintal to strength?
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K G
Limestone has better grindability in comparison to clinker; hence will be ground finer during inter-grinding. It does not react with alkalies released during cement hydration. However it acts as a inert filler during concrete hardening, resulting in refinement of pore structure and corresponding increase in strength. The percentage addition should be decided by conducting trials. http://www.drjdbapat.com
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Dr J D Bapat
Forgot to mention that when we changed precast vibrated C 45 strength using 360 kg CEM I 52.5 R cement to precast SCC 180 kg CEM 52.5 and added 180 kg GGBS and 180 kg GCC we reached easily C 65! In general, GCC will add to early and 28 day strength though at high amounts you might see a drop of 10% after one year.
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Boudewijn Piscaer
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