There
are two commonly known
methods of producing self compacting type concretes,
namely, the Powder and Admixture
Methods.
The
Powder
Method uses superplasticisers in conjunction with very
high cementitious
material contents (i.e. cement, fly ash, slag, etc) to form a paste
which
controls the homogeneity of the mix, improves its flowability and holds
the mix
constituents together and resists segregation.
The
Admixture
Method is based on the use of the new generation of
polycarboxylate
superplasticisers which offer the capability of providing for improved
flowability, viscosity and cohesion, as well as workability retention.
Depending
on the characteristics of constituent materials, a viscosity modifier
may also
be required.
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
