Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Carbon Fibers

Proportioning of Foamed Concrete Reinforced with Carbon Fibers

Eethar Tihanon Dawood; Waleed Abdulrazzaq Abbas; Yahya Ziad Mohammad

Engineering and Technology Journal, 2016, Volume 34, Issue 15, Pages 2864-2876

This paper shows the production of foamed concrete reinforced with carbon fibers. Firstly, different mortar mixes were prepared by varying ratio of sand/cement. Continuously, the selected mortar mix was used for the foamed concrete produced due to the results of density, compressive strength, splitting tensile strength and flexural strength test. Secondly, different foam agent amounts (0.8, 1, 1.2 and 1.4 kg/m3) with 10% of silica fume were included in the selected mortar mix to produce the optimum foamed concrete mix depending on the same set of tests mentioned above. Lastly, various volumetric fractions of carbon fibers (0.5, 1 and 1.5%) were incorporated with the optimum foamed concrete mix and the same set of tests was done to examine such foamed concrete reinforced with carbon fibers.
The results give acceptable ranges of strength for mortar mix using 1.9 sand/cement ratios. Besides, the foamed concrete produced by the inclusions of foaming agent 1 kg/m3 shows acceptable ranges of density and strength to be suitable for the reinforcing by carbon fibers. The carbon fiber included in the foamed concrete exhibit significant increases for the strengths. Such increases are varied from about 35% using 1% carbon fibers to 44% and 116% using 1.5% carbon fibers for compressive, splitting tensile and flexural strength, respectively

Mechanical Properties of High Performance Carbon Fiber Concrete

Wasan I. Khalil; Akar Abdulrazaq

Engineering and Technology Journal, 2011, Volume 29, Issue 5, Pages 906-924

In this research mechanical properties of high performance carbon fiber concrete
are studied. The experimental work includes, producing high performance concrete
using superplasticizer and condensed silica fume reinforced with different volume
fractions (0%, 0.2%, 0.3%, 0.4% and 0.5%) of carbon fibers. The effect of chopped
carbon fibers on the mechanical properties (compressive strength, splitting tensile and
flexural strengths, and modulus of elasticity) of high performance concrete was also
studied. Generally, the results show that the addition of carbon fibers improves the
mechanical properties of high performance concrete. Also the results show that Using
condensed silica fume as addition by weight of cement increases the compressive
strength more than that as replacement by weight of cement. The percentages increase
in compressive strength of concrete containing 15% silica fume as replacement and as
addition by weight of cement are about 14% and 26% respectively. The addition of
carbon fibers causes a slight increase in compressive strength and modulus of
elasticity of high performance concrete when the fiber volume fraction increases,
while the splitting tensile and flexural strengths shows a significant increase relative
to the reference high performance concrete (without fiber). The percentage increase in
splitting tensile and flexural strengths for high performance concrete with fiber
volume fraction 0.5% at 28 days is about 45% and 46% respectively.