SCC
should not be confused with high or very high slump (180mm to 250mm)
“flowable”
conventional concretes (which may also use the new generation of
polycarboxylate superplasticisers)which are still subject to
segregation
problems and require vibration to achieve compaction.
SCC
is not a traditional high-slump concrete. Photo on the
right (Courtesy of HokkaidoElectric
Power: Source-Concrete Monthly
: March’04 issue) shows the result of a slump test
conducted on an SCC mix.
Notice that the concrete has flowed like a viscous liquid rather than
exhibiting the traditional slump of a high slump concrete. It can be
noted that
the aggregates are uniformly distributed, there is no fringe of grout
and no
water standing on the patty or along the fringes. The concrete
is made
flowable by altering the mix proportions and through the use of
additional
admixtures that prevent segregation.
Traditionally,
high-slump concretes have been plagued with the tendency
to bleed and segregate. The development of SCC makes it possible to
produce a
concrete that would fall under the category of high-slump concrete;
however,
its behavior far exceeds that of a high-slump mix.
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
Electric
Power: Source-Concrete Monthly
: March’04 issue) shows the result of a slump test
conducted on an SCC mix.
Notice that the concrete has flowed like a viscous liquid rather than
exhibiting the traditional slump of a high slump concrete. It can be
noted that
the aggregates are uniformly distributed, there is no fringe of grout
and no
water standing on the patty or along the fringes. The concrete
is made
flowable by altering the mix proportions and through the use of
additional
admixtures that prevent segregation. 
