Early-age Performance of Cement Combination Concrete
Abstract: Heat of hydration up
to 72 hours and compressive strength up to 7 days of Portland cement and 17
binary and ternary cements containing fly ash, silica fume, and metakaolin, at
a water/cement ratio of 0.50 and addition contents of 20%, 35%, and 55%, were
used to examine the early-age performance of concrete. Results revealed that
early-age performance depends on the fineness, heat of hydration, and dilution
effect of cement combinations. Fly ash, due to dilution effect, reduces the
heat of hydration and compressive strength. Using silica fume and metakaolin
with increasing content of up to 10% as binary and ternary cement components,
due to their fineness and increased heat of hydration, supports the strength
development. Most of the cement combinations met the standard of strength
requirements for ordinary early-age performance of concrete, while only half of
it satisfied the standard for high early-age performance.
Keywords: Blended cement;
cement combination; compressive strength; fly ash; heat of hydration;
metakaolin; silica fume; supplementary cements
Author: Samuel Olufemi
Folagbade
Journal Code: jptsipilgg170033
