Research Information System
STRUCTURAL CONCRETE, pp.1-25, 2026 (SCI-Expanded, Scopus)
Hybrid fiber-reinforced self-compacting concrete (SCC) is gaining widespread
popularity in construction engineering applications owing to its superior hardened
concrete properties, while it isn't valid for workability, especially when it
includes a high volume of fibers. While the incorporation of fibers can enhance
the performance of SCC, it often challenges key fresh properties such as flowability
and passing ability, thereby necessitating mix adjustments that result in
additional costs. Furthermore, the high cost of fibers requires careful determination
of the optimal fiber type combination and content. In this context, the
aim and objective of this work is to comprehensively investigate the effects of
different types (steel and synthetic) and combination (single, binary and ternary)
of fibers on the workability (slump-flow, T500, J-ring and V-funnel) and
mechanical (compressive strength, splitting tensile strength, elastic modulus,
shear strength, and flexural tensile strength) properties of SCC mixes with low
hybrid fiber content (total by volume 0.75%). After defining the workability
properties of all mixes, mechanical property tests were performed on samples
with curing periods of 7-, 28-, and 56-days. According to the results obtained,
all fiber-reinforced SCC mixes exhibit high performance in terms of both workability
and mechanical properties. In particular, binary hybrid fiber systems
containing long hooked-end steel fibers and short straight steel fibers provided
the best overall performance, yielding more effective outcomes compared to
other mixes. In conclusion, this work has demonstrated that SCC mixes with
low hybrid fiber content can successfully meet a wide range of engineering
requirements, from workability to mechanical performance. This also implies
that these mixes offer significant advantages in terms of both cost-effectiveness
and ease of application due to workability superior of SCC mixes with low
hybrid fiber content. These outcomes emphasize that SCC mixes with low
hybrid fiber content can be safely used in structural concrete members subjected
to complex loads such as punching, shear, and bending, and may offer
more economical and sustainable alternatives to high-fiber content systems.