Highlights
- •
- A self-consolidating hybrid fiber reinforced concrete composite was developed.
- •
- The composite exhibits high workability and deflection hardening behavior.
- •
- Fibers ensure ductile response and internal confinement in compression.
- •
- Reinforced composites tested in tension exhibit tension stiffening behavior.
Abstract
The
workability of an existing Hybrid Fiber-Reinforced Concrete (HyFRC)
composite is improved though the incorporation of concepts from the
field of Self-Consolidating Concrete (SCC). The resulting composite,
achieved through a described parametric study, allows for easier
placement within areas of high reinforcement congestion while
maintaining the desired mechanical performance benefits inherent to high
performance hybrid fiber-reinforced concrete composites. Retention of
the strengthening and ductility enhancement, characteristic of the
original HyFRC, is gauged by material response to direct tension and
four point bending tests. The designated goal of the SC-HyFRC mix is to
provide an optimal structural material for construction in which
concrete might be expected to face tension, compression and bending as
part of a common service load and must be designed to withstand high
levels of deformation under maximum credible earthquake or similar
design scenarios. The ductility response of Self Consolidating Hybrid
Fiber Reinforced Concrete (SC-HyFRC) to severe loading is then
investigated through a comparison with conventional concrete by
conducting reinforced compression and tensile tests. In both scenarios
the presence of hybrid fiber reinforcement is shown to provide an
improvement to the phenomena of internal confinement and tension
stiffening, for compression and tension loading respectively, which
allow for a significantly improved post cracking response.
Keywords
- Self-consolidating;
- Hybrid fiber-reinforced concrete;
- Performance in compression;
- Damage resistance;
- Internal confinement;
- Tension stiffening
No comments:
Post a Comment