Cementitious materials are brittle and have an inherent weakness in
resisting in tension. Fibre reinforcement is an effective mean of
enhancing the fracture characteristics of concrete. An increase in
fibre volume concentration can have an adverse effect on the
tensile performance of a SFRC when very high strength, end-hooked
fibres are used in a matrix of moderate strength. The study showed
that an increase in fibre volume concentration can lead to a
decreased in the proportion of end-hooked fibres straightening
through the end-hook. In this case, failure of the matrix
surrounding the hook follows and significantly influences the
behaviour. A relationship between fibre and matrix mechanical
properties was developed and the result supports the findings
obtained from the tests conducted in this study. X-ray imaging was
undertaken on dog-bone specimens under load. The tests were used to
map the cracks around and through the fibre and a statistical model
was developed to determine fibre distribution.
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