This study has been undertaken to investigate the evaluation of Fiber-reinforced Foamed Concrete (FRFC) performance by the use of toughness and non-destructive tests. These tests cover the workability, density, static modulus of elasticity, toughness, ultrasonic pulse velocity and absorption tests. Different FRFC mixes using carbon fibers in the order of 0.5, 1 and 1.5% carbon fibers were used. Also, the combinations of carbon fibers (C) and polypropylene fibers (PP) as 1% C+ 0.5% PP, and 0.5% C+1% PP were prepared. Lastly, the inclusion of polypropylene fibers with the order of 1.5% PP was used to strengthen the foamed concrete mix.The results showed that the use of 1.5% of C has affected the modulus of elasticity and flexural toughness of foamed concrete.On the other hand, a strong relationship is found between compressive strength and ultrasonic pulse velocity for FRFC.

The properties of foamed concrete reinforced with carbon fibres and hybrid fibres of carbon with polypropylene fibres has been studied. Various volumetric fractions of carbon fibres (0.5, 1 and 1.5%), hybrid fibres of carbon fibres (CF) with polypropylene fibres (PPF) as (1% CF + 0.5% PPF) & (0.5% CF + 1% PPF), also the mono polypropylene fibres as 1.5% PPF were used to reinforce foamed concrete mix. Fresh and hardened properties of all mixes included flowability, density, absorption, compressive strength, splitting tensile strength, and flexural strengths has been tested. Results showed that inclusion of carbon fibres up to 1% volumetric fraction may increase the compressive strength by about 36% higher than that of control mix. Whereas, the use of 1.5% carbon fibres exhibit significant increase in splitting and flexural tensile strengths by about 47 and 114%, respectively, compared to the reference mix. On the other hand, the hybridization of 1% CF + 0.5% PPF increased the splitting tensile strength and flexural strengths by 53% and 114%, respectively, compared with plain foamed concrete mix.

This paper demonstrates the behavior of foamed concrete reinforced with either or both carbon fibers and polypropylene fibers exposed to elevated temperatures. Various volumetric fractions of carbon fibers (0.5, 1 and 1.5%) were used to reinforce foamed concrete mix. Also, hybrid fibers of carbon fibers (CF) and polypropylene fibers (PPF) as 1%CF + 0.5% PPF and 0.5%CF + 1%PPF were prepared. Lastly, the mono polypropylene fibers as 1.5% PPF were used to reinforce the foamed concrete mix. These different mixes were tested, compressive strength, splitting tensile strength, flexural strength and flexural toughness tests. Besides, the heating procedure of the specimens was done by applying them to different burning degrees, which were 200, 250, 300, 350 and 400 °C. The results illustrated that the compressive and flexural tensile strengths of lightweight foamed concrete (LWFC) decreased with the increasing temperature. However, the highest effects on these strengths appeared once the temperature raised to 400 °C. The LWFC mix reinforced with polypropylene fiber exhibits more sensitive to elevated temperature than LWFC mixes reinforced with carbon fiber due to low melting point of polypropylene fiber.

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/m 3 ) 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/m 3 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