This chapter of the presentation describes the uses for silica fume in
concrete. These uses fit into the general categories of enhancing
mechanical properties, improving durability, enhancing constructability. A
special use of silica fume is the production of high-performance concrete
bridges where the strength and durability properties of the concrete are
critical. This use of silica fume is also described.Although increasing concrete strength using silica fume has gained the most
attention, more silica fume has actually been used in applications where
increased durability is the driving factor.
For the purposes of this presentation, the uses of silica fume have been
divided into distinct categories. It should be remembered that adding
silica fume will affect all concrete properties simultaneously. For
example, reducing the permeability of concrete will usually increase the
compressive strength of that concrete. The amount of increase will depend
upon the concrete mixture selected.
You should look at all aspects of concrete performance when specifications
for silica-fume concrete are being written.
