Eﬀects of grids on the tensile and flexural behavior of hybrid fiber high performance concrete

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-06-12 DOI:10.1016/j.conbuildmat.2025.142242

Zhu Bian , Yi Han , Liting Du , Jiachen Gao , Zhenghua Zhou , Liguo Jin

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引用次数: 0

Abstract

To identify suitable retrofitting materials for enhancing structural performance, four types of grids were integrated into hybrid fiber high-performance concrete (HyFHPC), which is a high-performance concrete mixed with two types of short fibers—steel fibers and PE fibers. A comprehensive experimental program tested 20 composite plate series, grouped into plain high-performance concrete (HPC), grid-reinforced HPC (GR-HPC), HyFHPC, and grid-reinforced HyFHPC (GR-HyFHPC). Uniaxial tensile and four-point bending tests were conducted on all specimens to investigate the influence of matrix type, grid type, and grid layer on the mechanical properties and failure characteristics of the composites. The comprehensive energy dissipation index was introduced to thoroughly quantify the properties of composites under tensile and bending conditions. Digital image correlation (DIC) technology was utilized to analyze the crack and strain evolution. Results indicated that the addition of grids mitigated the brittleness of HPC, although the bonding between them was weak. All GR-HyFHPC combinations exhibited enhanced strength, deformation, and bonding capabilities. The comprehensive energy dissipation index provided a scientific and convenient method for assessing the performance of the composites. DIC technology accurately captured crack evolution and strain distribution, offering an intuitive platform for analyzing specimen behavior. Overall, the GR-HyFHPC combinations demonstrated remarkable performance in terms of strength and ductility, highlighting their comprehensive energy dissipation capacity and showing significant potential for structural retrofitting applications.

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网格对混杂纤维高性能混凝土拉伸和弯曲性能的影响

为了确定适合的增强结构性能的改造材料，将四种类型的网格集成到混合纤维高性能混凝土（HyFHPC）中，这是一种混合了两种短纤维-钢纤维和PE纤维的高性能混凝土。一项全面的试验计划测试了20个复合板系列，分为普通高性能混凝土（HPC）、网格增强高性能混凝土（GR-HPC）、HyFHPC和网格增强HyFHPC （GR-HyFHPC）。对所有试件进行单轴拉伸和四点弯曲试验，研究基体类型、网格类型和网格层对复合材料力学性能和破坏特征的影响。引入综合能量耗散指数，全面量化复合材料在拉伸和弯曲条件下的性能。采用数字图像相关（DIC）技术对裂纹和应变演化进行了分析。结果表明，栅格的加入减轻了高性能混凝土的脆性，但栅格之间的结合较弱。所有GR-HyFHPC组合均表现出增强的强度、变形和粘合能力。综合耗能指标为评价复合材料的性能提供了一种科学、便捷的方法。DIC技术准确地捕捉了裂纹演化和应变分布，为分析试样行为提供了直观的平台。总体而言，GR-HyFHPC组合在强度和延性方面表现出卓越的性能，突出了其综合耗能能力，在结构改造应用中显示出巨大的潜力。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.