钢纤维和聚乙烯醇纤维对超高性能混凝土断裂和力学性能的协同作用

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2024-02-01 DOI:10.1680/jmacr.23.00130

Junxia Liu, Shujie Zang, Fei Yang

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引用次数: 0

摘要

本文研究了钢纤维、聚乙烯醇（PVA）纤维及其混合纤维的体积分数对超高性能混凝土（UHPC）力学性能和断裂力学性能的影响。为了分析钢纤维和聚乙烯醇纤维对超高强混凝土变形性能的协同作用，通过等总纤维体积分数和等钢纤维体积分数两种方法得到了混合纤维增强超高强混凝土与钢纤维增强超高强混凝土力学参数的增益比。结果表明，钢纤维和 PVA 纤维在一定程度上降低了 UHPC 的抗压强度，且随着纤维体积分数的增加，抗弯抗压比和抗拉抗压比逐渐增大。钢纤维和 PVA 纤维的加入明显改善了纤维增强 UHPC 的断裂力学性能，并且后者在改善 UHPC 变形性能方面优于前者。除抗压强度外，等钢纤维体积分数计算的混合纤维 UHPC 与钢纤维 UHPC 的力学参数增益比均高于等总纤维体积分数的相应结果，这表明 0.25 v% 的 PVA 纤维作为改性组分与钢纤维增强 UHPC 混合，可进一步改善其弯曲拉伸和断裂力学性能。

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Synergism of steel fibers and polyvinyl alcohol fibers on the fracture and mechanical properties of ultra-high performance concrete

The influence of the volume fraction of steel fibers, polyvinyl alcohol (PVA) fibers and their hybrid fibers on the mechanical and fracture mechanical properties of ultra-high performance concrete (UHPC) was studied in this paper. To analyze the synergistic effect of steel fibers and PVA fibers on the deformation properties of UHPC, the gain ratio of mechanical parameters of hybrid fibers reinforced UHPC to steel fibers reinforced UHPC, obtained by two ways, equal total fibers volume fraction and equal steel fibers volume fraction. The results show that steel fibers and PVA fibers reduce the compressive strength of UHPC to some extent, and with the increasing of fibers volume fraction, the flexural-compressive ratio and tension-compression ratio increase gradually. The fracture mechanical properties of fibers reinforced UHPC were significantly is improved by the participation of steel fibers and PVA fibers, and the latter are superior to former in improving the deformation properties of UHPC. Except compressive strength, the mechanical parameters gain ratio of hybrid fibers UHPC to steel fibers UHPC calculated with equal steel fibers volume fraction is higher than the corresponding results of the equal total fibers volume fraction, which indicates that 0.25 v% PVA fibers as the modified component is mixed with steel fibers reinforced UHPC, can further improve its bending tensile and fracture mechanical properties.

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.