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Open AccessArticle

Polyamide Fiber Reinforced Shotcrete for Tunnel Application

1
R & BD Center, Kolon Global Corp., Yongin, Gyunggi 17023, Korea
2
Department of Civil Engineering, Chungnam National University, Daejeon 34134, Korea
3
Department of Architectural Engineering, Chungnam National University, Daejeon 34134, Korea
4
Department of Urban Construction Engineering, Incheon National University, Incheon 22012, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Luciano Feo
Materials 2016, 9(3), 163; https://doi.org/10.3390/ma9030163
Received: 3 February 2016 / Revised: 24 February 2016 / Accepted: 1 March 2016 / Published: 5 March 2016
(This article belongs to the Section Structure Analysis and Characterization)
This study intends to establish the mechanical properties of polyamide fiber reinforced shotcrete (PAFRS) in terms of compressive and flexural strengths, in accordance with ASTM C1609/C1609M-12. The mechanical properties identified the influence of polyamide fiber content on the PAFRS strength. This study evaluated the toughness of PAFRS and proposed additional toughness level criteria to better represent organic fiber performance. In addition, the fiber rebounding rate and PAFRS performance in tunneling application were evaluated based on a tunnel application in Korea. PAFRS with 0.6%~0.8% volume content in tunneling shotcrete could significantly improve flexural ductility, toughness, and ultimate load capacity. Fiber rebounding tests exhibited a low rebounding rate (8.5%) and low fiber drop (63.5%). Therefore, PAFRS applied to a tunnel exhibited stability and constructability. View Full-Text
Keywords: fiber; macro; polyamide; shotcrete; tunnel fiber; macro; polyamide; shotcrete; tunnel
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Jeon, J.K.; Kim, W.; Kim, G.Y.; Jeon, C.K. Polyamide Fiber Reinforced Shotcrete for Tunnel Application. Materials 2016, 9, 163.

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