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首页> 外文期刊>Magazine of Concrete Research >Impact resilience of multiscale fibre reinforced composites
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Impact resilience of multiscale fibre reinforced composites

机译：多尺度纤维增强复合材料的冲击回弹

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摘要

This research considered cementitious composites reinforced with macroscale, microscale and nanoscale fibres. Ten test groups including a combination of the multiscale fibres (steel fibres, polyvinyl alcohol (PVA) fibres and carbon nanofibres (CNFs)) were studied. An experimental programme was developed to determine the compressive, tensile and flexural strength as well as impact toughness. This multiscale fibre reinforcement (steel, PVA and CNFs) in normal concrete mixes for practical applications led to a tenfold increase in impact resilience, based on a small-scale repeated impact test performed in this study, and also considerably enhanced the tensile strength of the cementitious composites. On the other hand, cementitious composites singly reinforced with nanoscale CNFs in normal concrete mixes including coarse and fine aggregates showed negligible improvements in impact toughness and tensile strength. Three-point bending tests on reinforced concrete beam specimens showed that the macroscale structural performance of the concrete members was enhanced with the addition of multiscale fibres. The toughness or energy absorption capability increased by 29%. It is therefore concluded that multiscale fibre reinforcement, including CNFs, has the potential to reduce the projectile-target collision force due to increased ductility of the concrete members and to alleviate concrete spalling resulting from projectile penetration on account of increased toughness.
机译：这项研究考虑了用宏观，微米和纳米级纤维增强的水泥复合材料。研究了十个测试组，包括多尺度纤维（钢纤维，聚乙烯醇（PVA）纤维和碳纳米纤维（CNF））的组合。开发了一个实验程序来确定压缩，拉伸和弯曲强度以及冲击韧性。在这项研究中进行的小规模重复冲击试验的基础上，在实际应用中的普通混凝土混合物中，这种多尺度纤维增强材料（钢，PVA和CNF）使冲击回弹力提高了十倍，并且还大大提高了其抗拉强度。水泥基复合材料。另一方面，在包括粗骨料和细骨料在内的普通混凝土混合物中，用纳米级CNF单独增强的水泥基复合材料在冲击韧性和拉伸强度方面的改善可忽略不计。钢筋混凝土梁试件的三点弯曲试验表明，加入多尺度纤维可增强混凝土构件的宏观结构性能。韧性或能量吸收能力提高了29％。因此得出的结论是，包括CNF在内的多尺度纤维增强材料有可能降低由于混凝土构件的延展性而产生的弹丸与目标的碰撞力，并由于韧性增加而减轻由弹丸渗透造成的混凝土剥落。

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  • 来源
    《Magazine of Concrete Research》 |2016年第8期|379-390|共12页
  • 作者

    Masud Mahadi; Chorzepa Mi Geum;

  • 作者单位

    Univ Georgia, Coll Engn, Athens, GA 30602 USA;

    Univ Georgia, Coll Engn, Athens, GA 30602 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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