Ultrahigh-performance concrete (UHPC) is susceptible to various forms of abrasion during its service life. This study is an investigation of the abrasion resistance of UHPC, focusing on two primary causes of wear: dynamic traffic loads and hydraulic impacts. To enhance the material's resistance to abrasion, milling steel fibres were utilised. For comparative purposes, straight steel fibres and hybrid milling–straight steel fibres were also employed. The protective function of the steel fibres primarily comes into effect once the concrete cover has experienced wear. When subjected to traffic and hydraulic loads, UHPC containing milling fibres exhibited superior resistance, compared with that containing straight fibres, while maintaining favourable workability. Notably, the UHPC incorporating hybrid steel fibres, which form a composite skeleton, owing to the presence of two fibre types, demonstrated even greater effectiveness in resisting external abrasion. Furthermore, the abrasion resistances observed under both traffic and hydraulic conditions displayed a positive linear correlation, with R² > 0.8. These findings suggest the feasibility of evaluating the material's abrasion resistance under various wearing causes using a single test method. The outcomes of this study hold promise in advancing the development of UHPC and promoting its utilisation in conditions characterised by severe abrasion.

中文翻译：

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铣削钢纤维超高性能混凝土的耐磨性

超高性能混凝土 (UHPC) 在其使用寿命期间容易受到各种形式的磨损。本研究是对 UHPC 耐磨性的研究，重点关注磨损的两个主要原因：动态交通载荷和水力冲击。为了增强材料的耐磨性，使用了铣削钢纤维。出于比较目的，还使用了直钢纤维和混合铣削-直钢纤维。钢纤维的保护功能主要在混凝土保护层经历磨损后发挥作用。当承受交通和液压载荷时，与含有直纤维的 UHPC 相比，含有铣削纤维的 UHPC 表现出优异的阻力，同时保持良好的可加工性。值得注意的是，由于存在两种纤维类型，采用混合钢纤维的 UHPC 形成复合骨架，在抵抗外部磨损方面表现出更大的有效性。此外，在交通和水力条件下观察到的耐磨性显示出正线性相关性，R ²  > 0.8。这些发现表明使用单一测试方法评估材料在各种磨损原因下的耐磨性的可行性。这项研究的结果有望推动 UHPC 的发展并促进其在严重磨损条件下的使用。