When
designing an SCC mix, a suitable mix is selected among "Powder- type"
by increasing the powder content, "VMA-type" using viscosity
modifying admixture and "Combined- type" by increasing powder content
and using viscosity agent in consideration of structural conditions,
constructional conditions, available material, restrictions in concrete
production plant, etc.
Examples
of SCC mixes are given in the following tables to provide a feel for
how SCC
mixes differ from normal concrete mixes and from each other based on
the
specific needs of a project. In comparison to the conventional
concrete, all
three types work with an increased amount of superplasticizer.
Table
1 shows typical SCC mixes in Japan.
Mix J1 (Powder-type) is an example of SCC used in a LNG tank, Mix J2
(VMA-type)is an example of SCC used for a massive caisson foundation of
a
bridge, and Mix J3 (Combined- type)is an example of SCC used in usual
reinforced concrete structures.
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
