Jeon Joong Kyu, Kim WooSeok, Kim Gyu Yong, Jeon Chan Ki
R & BD Center, Kolon Global Corp., Yongin, Gyunggi 17023, Korea.
Department of Civil Engineering, Chungnam National University, Daejeon 34134, Korea.
Materials (Basel). 2016 Mar 5;9(3):163. doi: 10.3390/ma9030163.
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.
本研究旨在根据ASTM C1609/C1609M - 12标准，确定聚酰胺纤维增强喷射混凝土（PAFRS）在抗压强度和抗弯强度方面的力学性能。力学性能确定了聚酰胺纤维含量对PAFRS强度的影响。本研究评估了PAFRS的韧性，并提出了额外的韧性等级标准，以更好地体现有机纤维的性能。此外，基于韩国的一个隧道应用项目，评估了纤维回弹率和PAFRS在隧道施工中的性能。隧道喷射混凝土中体积含量为0.6%至0.8%的PAFRS可显著提高抗弯延性、韧性和极限承载能力。纤维回弹试验显示出较低的回弹率（8.5%）和较低的纤维掉落率（63.5%）。因此，应用于隧道的PAFRS具有稳定性和可施工性。
