Abstract The present paper proposes a novel class of fibre reinforced concrete, realized by using shape memory alloy (SMA) fibres as reinforcement in ultra-high performance concrete (UHPC). SMAs can change their geometry imposed by a solid to solid phase transformation triggered by thermal activation or stress. This effect gives the possibility to use one geometry of fibres giving a minimum negative impact on the rheological properties and workability of concrete and a second geometry of the fibres for maximum positive impact on final mechanical properties. The present work highlights the influence of fibres with various shapes on the workability and the mechanical properties. The impact of SMA fibres in fresh and hardened UHPC compared to UHPC prepared with standard steel fibres is discussed. In light of the advances related to the unique properties of the SMA fibres, this novel concrete is referred to as “Functional Microfibre reinforced Ultra-High Performance Concrete” (FMF-UHPC).

中文翻译：

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功能性微纤维增强超高性能混凝土 (FMF-UHPC)

摘要 本文提出了一种新型纤维增强混凝土，它是通过使用形状记忆合金 (SMA) 纤维作为超高性能混凝土 (UHPC) 中的增强材料实现的。SMA 可以改变其几何形状，这是由热激活或应力触发的固相转变造成的。这种效应使使用一种几何形状的纤维对混凝土的流变性能和可加工性产生最小的负面影响和第二种纤维几何形状对最终机械性能的最大积极影响成为可能。目前的工作强调了各种形状的纤维对可加工性和机械性能的影响。讨论了与使用标准钢纤维制备的 UHPC 相比，SMA 纤维在新鲜和硬化 UHPC 中的影响。