TITLE:
Experimental Investigation on the Properties of Recycled Concrete Using Hybrid Fibers
AUTHORS:
Salim Khoso, Janet Raad, Azadeh Parvin
KEYWORDS:
Fiber-Reinforced Concrete, Fly-Ash, Compressive Strength, Tensile Strength, Carbon Fiber, Glass Fiber, Stainless Steel Fiber
JOURNAL NAME:
Open Journal of Composite Materials,
Vol.9 No.2,
April
16,
2019
ABSTRACT: Due to the inherent property of concrete being very weak in tension,
efforts have been made to overcome this deficiency by adding various type of
fibers like carbon fiber reinforced polymer (CFRP), glass fiber reinforced
polymer (GFRP), polypropylene fiber (PPF) and stainlesssteel fiber (SSF)
smeared into the concrete mix. The present study involves experimental
investigation on the use of GFRP, CFRP and SSF fibers alone or as combination
to improve the mechanical properties of concrete. Furthermore, concrete
cylinders were cast and tested for compression and tension using 10% fly ash as
cement replacement in all specimens. Besides fiber material types, fiber
reinforcement ratios of 1% and 1.5% were tested to investigate the mechanical
properties of concrete. In all concrete cylinder tests, the fiber reinforcement
ratio of 1% had a significant contribution in increasing the tensile strength
as oppose to compressive strength. As a result, the tensile
and compressive strengths were increased by 26% and 11%, respectively as
compared to the control specimen. Increasing the fiber reinforcement ratio from
1% to 1.5%, resulted in diminishing the mechanical properties of concrete.
However, reduction in concrete compressive strength was more prominent than the
tensile strength. Furthermore, it was observed that, the crack propagation was
decreased with the increase of fiber content when compared to the control
specimen.