Fracture Energy Of Hybrid Polypropylene–steel
Fiber High Strength Concrete
Author(s)
H. S. J. Al Hazmi, W. H. Al Hazmi, M. A. Shubaili
& H. E. M. Sallam
Abstract
Fracture behavior of high strength concrete (HSC) with different types of short
fiber (steel, polypropylene (PP), and steel + pp) was investigated in the present
work. The fracture behavior of edge-notched beam was determined in three-point
bending condition. The crack length to depth ratio, a/d, was equal to 0.2, 0.3, 0.4
and 0.5. The fracture parameters were determined using linear elastic fracture
mechanics (LEFM) and the Hillerborg model. The results in the present paper
indicated that, adding short fibers to HSC improved its compressive strength in
addition to the obvious enhancement in ductility. The mode of failure for various
fiber reinforced concrete (FRC) types under compression was varied compared
to that of plain concrete. All these cubes failed due to multiple tensile vertical
cracks. In general, a small effect of short fibers in improving the indirect tensile
strength and flexural strength of HSC. HSC with Steel and PP Hybrid Fiber
(SPPFRC) showed superior compressive, tensile, and flexural strengths over the
others FRCs. Fracture toughness based on LEFM (KIC) has a limited variation
with increasing a/w for HSC and all FRCs. Therefore, the mean value of KIC is
calculated and trusted. The predicted values of undamaged defect based on
LEFM are comparable to the maximum aggregate size. Therefore, the values of
KIC calculated based on LEFM were reasonable.
Keywords: high strength concrete, hybrid fiber reinforced concrete, flexural
toughness, linear and non-linear fracture mechanics, fracture energy.
Keywords
high strength concrete, hybrid fiber reinforced concrete, flexuraltoughness, linear and non-linear fracture mechanics, fracture energy.
Related Book
Other papers in this volume
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