The results of flexural testing showed that for the mono-fibre mixes, the steel fibres yielded the

strength, stiffness, flexural strength, etc. Initial research on FRC used a single fibre type but

use of two, or more, fibres, with distinct stiffness and strain to failure characteristics, in a

mixes of steel and polypropylene fibres and steel and glass fibres exhibited the highest synergy

fraction of 1.5% were found to produce the best flexural performance suggesting that the hybrid

and polypropylene fibres and steel and glass fibres at a total volume fraction of 1.5% gave the

more recently mixtures containing more than one fibre type have been investigated. Such fibre

2271N/m respectively were recorded for the steel fibre mixes containing fibre volume fraction

Ultimate bond stresses during tensile pull-out were improved by the addition of fibres in the

with fibres such as steel, polypropylene, and glass being used to improve properties such as