Akademik Veri Yönetim Sistemi
Advances in Concrete Construction, cilt.18, sa.3, ss.227-235, 2024 (SCI-Expanded)
This study involves the experimental investigation of the effects of steel fiber volume fraction and aspect ratio on
the fracture parameters of steel fiber reinforced lightweight concrete (SFLWC). Specimens were produced by adding steel fibers
with aspect ratios (steel fiber length/steel fiber diameter) of 55, 65 and 80 at fiber contents of 0, 15 kg/m3, 30 kg/m3, 45 kg/m3
and 60 kg/m3 to lightweight concrete produced using pumice aggregate. The reference lightweight concrete strength class was
taken as LC25/28. Compressive, splitting tensile and flexural tensile tests were performed on specimens. Load-crack mouth
opening displacement (CMOD) curves, fracture energies, characteristic lengths and fracture toughness were also determined by
flexural tests. The stresses transferred to the steel fibers after the first crack were carried by the steel fibers, preventing sudden
failure and this behavior continued until the steel fibers were pulled out from the matrix. Accordingly, the steel fibers improved
the behavior of the concrete after the peak load and continued to deform under decreasing load. With increasing amount of
strain, the toughness or energy absorption capacity of the semi-brittle concrete increased. Based on the test results obtained,
significant increases in fracture energy, splitting and flexural tensile strengths were obtained by increasing the amount of steel
fiber.