Comparison between condensed silica fume and FAG
Comparisons between the compressive strength of concrete
mixed with condensed silica fumes (SFI and SFII) and
that of FAG at all ages are presented in Figs. 13 and 14. At
the age of 7 days, the compressive strengths of concretes
mixed with 10% condensed silica fume and concretes mixed
with FAG regardless of percentage replacement were almost
the same. After 7 days, the compressive strengths of FAG
concretes constantly increased with curing ages, while the
SFI and SFII concretes tended to have an initially high rate
of strength increase, which slowed down after 28 days. At
180 days, the highest compressive strength of concrete with
FAG was FAG25 (100.3 MPa), while that of concrete with
condensed silica fume was SFI10 (100.2 MPa). The results
also indicated that the concrete replaced by FAG of 15%,
25%, and 35% gave equal or higher compressive strength
than those of condensed silica fume concretes. These results
led to the conclusion that the FAG concretes gave the same
compressive strengths as those of condensed silica fume.