A parametric experimental study has been conducted to investigate the effect of polypropylene fiber on
the workability and durability of the concrete composite containing fly ash and silica fume. Four different
fiber volume fractions (0.06%, 0.08%, 0.1% and 0.12%) were used. The results indicate that the addition of
polypropylene fiber has a little adverse effect on the workability of concrete composite containing fly ash
and silica fume. With the increase of fiber volume fraction, both of the slump and slump flow are decreasing
gradually. However, the addition of polypropylene fiber has greatly improved the durability of the
concrete composite containing fly ash and silica fume. The length of water permeability, the dry shrinkage
strain and the carbonation depth of concrete containing fly ash and silica fume are decreasing gradually
with the increase of fiber volume fraction as the fiber volume fraction is below 0.12%. Besides,
freeze–thaw resistance of polypropylene fiber reinforced concrete containing fly ash and silica fume
was found to slightly increase when compared to the concrete composite without fibers. Moreover, there
is a tendency of increase in the freeze–thaw resistance with the increase of fiber volume fraction as the
fiber volume fraction is below 0.08%. However, the freeze–thaw resistance begins to decrease slightly
after the fiber volume fraction beyond 0.08%.