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Materials 2016, 9(8), 704; doi:10.3390/ma9080704

Hybrid Effect Evaluation of Steel Fiber and Carbon Fiber on the Performance of the Fiber Reinforced Concrete

1
Department of Civil and Environmental Engineering, The University of Tennessee, Knoxville, TN 37996, USA
2
School of Civil and Mechanics Engineering, Central South University of Forestry and Technology, Changsha 410004, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jérôme Chevalier
Received: 10 April 2016 / Revised: 20 July 2016 / Accepted: 16 August 2016 / Published: 18 August 2016
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Abstract

Fiber reinforcement is an important method to enhance the performance of concrete. In this study, the compressive test and impact test were conducted, and then the hybrid effect between steel fiber (SF) and carbon fiber (CF) was evaluated by employing the hybrid effect index. Compressive toughness and impact toughness of steel fiber reinforced concrete (SFRC), carbon fiber reinforced concrete (CFRC) and hybrid fiber reinforced concrete (HFRC) were explored at steel fiber volume fraction 0.5%, 1%, 1.5% and carbon fiber 0.1%, 0.2%, 0.3%. Results showed that the addition of steel fiber and carbon fiber can increase the compressive strength. SF, CF and the hybridization between them could increase the compressive toughness significantly. The impact test results showed that as the volume of fiber increased, the impact number of the first visible crack and the ultimate failure also increased. The improvement of toughness mainly lay in improving the crack resistance after the first crack. Based on the test results, the positive hybrid effect of steel fiber and carbon fiber existed in hybrid fiber reinforced concrete. The relationship between the compressive toughness and impact toughness was also explored. View Full-Text
Keywords: steel fiber; carbon fiber; hybrid fiber reinforced concrete; compressive toughness; impact toughness; hybrid effect steel fiber; carbon fiber; hybrid fiber reinforced concrete; compressive toughness; impact toughness; hybrid effect
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Song, W.; Yin, J. Hybrid Effect Evaluation of Steel Fiber and Carbon Fiber on the Performance of the Fiber Reinforced Concrete. Materials 2016, 9, 704.

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