03-10-2012, 04:15 PM
Silica Fume - High Strength Concrete
CSF HighStrength.pdf (Size: 234.38 KB / Downloads: 104)
Economics
The drive behind silica fume high
strength concrete is economics.
Columns. Figure 2 shows that the
lowest column cost to carry a given
load results by using silica fume
high strength concrete and deleting
expensive reinforcing steels.
Shaft Walls. The great economic
benefit is indirect. For example the
value of extra floor space when
80MPa silica fume high strength
concrete is used instead of 40 Mpa
concrete could be as much as 50%
of the core construction cost.
General. Wherever concrete is in
compression high strength
concrete can be used to reduce
material cost. Inevitably other cost
savings are even greater. For
example thinner tunnel segments
leads too a great saving in
excavation costs.
Physical Properties
Strength requirements
are balanced between
early age for stripping
and long term
structural performance.
Silica fume is a key
component of high
strength concrete as it
contributes to strength
at early and later ages
High strength concrete
High strength concrete is far more
difficult to achieve at the job site than
in the laboratory. Factors like
pumpability (fig 1) and setting time for
slip forming makes it is essential that
the project team (fig 7) work together
for success. Our group can assist in
establishing a functional project team.