The
reason for compacting conventional concrete is to ensure that maximum
density
is achieved by fully expelling entrapped air entrained during mixing
and
placing, and to further ensure that the concrete is in full contact
with both
the steel reinforcement and the formwork.
This
ensures satisfactory strength, sound impermeable concrete with
satisfactory
detail at corners, good bond with the steel reinforcement, good finish
and
appearance and impermeable protective cover to the steel
reinforcement.
SCC
on the other hand does not require any mechanical effort such as the
use of
immersion vibrators or external formwork vibrators, to achieve full
compaction. A
well designed and produced SCC has the capability to flow under its own
weight
through and around congested steel reinforcement fully encapsulating
it,
completely filling the space within the formwork, without any loss of
strength,
stability or homogeneity, while still achieving the same outcomes of
good
compaction.
Concrete-Techgroup
expresses its gratitude to Mr
Larry Storer for permitting the use
of article “Self-compacting concrete: powerful tool for
complicated pours”
(written by Tim Avery in March’04 issue of CONCRETE
Monthly). Other
References: 1.“Development
of High-Strength Self-Compacting Concrete with reduced segregation
potential” by
Dr. R. Sri Ravindrarajah, D. Siladyi and
B. Adamopoulos 2.“Ultra
High Performance Self Compacting Concrete”
by
Jianxin Ma1 & Jorg Dietz1 3.Vic
roads: GEO PAVE : Technical Note on Self Compacting Concrete 4.
“Self-Compacting Concrete : Development, Applications and
Investigations” by
Masahiro Ouchi 5.
“Applications of Self-Compacting Concrete in Japan, Europe and the United States”: US
FHWA
