الفهرس 
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Abstract
The use of ultra-high-performance- fibre reinforced concrete
(UHPFRC) in structural applications has significantly increased owing to
its numerous advantages. (UHPFRC) if compared with conventional
normal concrete (NC) and high-performance concrete (HPC), UHPFRC
exhibits superior properties in terms of compressive behavior, tensile
behavior, and durability.
This study has investigated the mechanical properties (UHPFRC),the
studied properties are (Compressive strength, modulus of elasticity,
Poisson’s ratio, f1exural strength, tensile strength and bond strength). The
major parameters included in this research were steel fibre volume
fractions (Vr =0%, 1 %,2% and 3%) and steel fibre Aspect ratio (lId = 30
and 50).
The research program consisted of seven UHPFRC mixes with
different values of steel fibre volume fractions and aspect ratios. The
relation between compressive strength and other mechanical properties
were also investigated.
The test results showed that adding steel fibres resulted in an
improvement the mechanical properties of UHPC. Compressive strength,
modulus of elasticity, splitting tensile strength, flexural strength and bond
strength are on higher side for 3% steel fibres volume fraction as
compared to those produced from 0%, 1 % and 2% fibres volume fraction.
All strength properties were observed to increase with increasing
aspect ratio of 50 as compared to those for aspect ratio 30.Compressive
strength increases 4.0% , modulus of elasticity increases 6.0%, flexural
strength increases 15%, splitting tensile strength increases 34% and bond
strength increases 5% with addition of steel fibre volume fraction 1 %
.Compressive strength increases 18.0% , modulus of elasticity increases
11.0%, f1exural strength increases 40%, splitting tensile strength
increases 67% and bond strength increases 11 % with addition of steel
fibre volume fraction 3% .