Resistance Of Ultra High Performance Fibre
Reinforced Concrete To Projectile Impact
Author(s)
P. Máca & R. Sovják
Abstract
The aim of this work is to describe the resistance of ultra high performance fibre
reinforced concrete (UHPFRC) to projectile impact. The main goal is to find an
optimum fibre content in the UHPFRC mixture with respect to the resistance to
projectile impact, strength and workability. In addition, the authors describe the
formulation process of UHPFRC that was developed without using heat
treatment, pressure or a special mixer. Only ordinary materials available
commercially in the Czech Republic were utilized throughout the process. The
compressive strength of the resulting UHPFRC mixtures exceeded 150 MPa
after 28 days and the flexural strength in three point bending was in the range of
40 MPa. Such high strengths were achieved due to the utilization of the high
strength fibres and low water-to-binder ratio. The resistance of the UHPFRC to
projectile impact is evaluated experimentally. Slabs made of UHPFRC with
different fibre content were hit by deformable projectiles. The magnitude of the
impact damage induced in the concrete specimens was evaluated from the
average crater diameter and penetration depth. It was verified experimentally that
an increase of fibre content has no significant effect on penetration depth while
decreasing crater diameter. It was found that with respect to the resistance to
projectile impact, strength and acceptable workability the optimal fibre content
in the UHPFRC mixture is between 2 and 3% by volume.
Keywords: cementitious composite, fibre reinforced concrete, optimization, local
damage, mechanical properties, projectile impact.
Keywords
cementitious composite, fibre reinforced concrete, optimization, local
damage, mechanical properties, projectile impact
Related Book
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