Effects of hybrid steel/bamboo fibers on the static performance and microstructure of UHPC

IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Hua Zhao , Jie Tang , Tao Zhou , Ziwei Li , Tianwang Xiong , Baomin Wang
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Abstract

This study introduces a novel approach to ultra-high-performance concrete (UHPC) by hybridizing steel and bamboo fibers, providing a sustainable alternative to traditional fiber-reinforced UHPC without compromising mechanical integrity through the inclusion of biodegradable materials. UHPC was prepared and evaluated for macro- and micro-level properties using bamboo fibers of different lengths (6 mm, 12 mm, and 18 mm) combined with steel fibers, with a total fiber volume content of 2.0 %. Results show that combining 0.5 %–1.5 % of 12 mm bamboo fibers with 1.5 %–0.5 % steel fibers achieves an optimal balance, enhancing the flexural strength and toughness of UHPC while minimizing the trade-off in compressive strength caused by natural fibers. Due to its inherent hygroscopic properties, bamboo fiber reduces drying shrinkage in UHPC, forming a moisture-buffering system within the matrix that extends internal curing time and reduces volume changes. Microscopically, bamboo fibers increase UHPC’s porosity, which promotes sustained hydration and the formation of calcium silicate hydrate (C-S-H) gel. Steel fibers provide the structural rigidity and crack resistance necessary to maintain UHPC’s mechanical performance, creating a synergistic reinforcement mechanism. This study pioneers a green reinforcement strategy in ultra-high-performance concrete through the complementary use of natural and synthetic fibers, laying a foundation for further development of high-performance, eco-friendly concrete materials.
钢/竹混杂纤维对UHPC静力性能和微观结构的影响
本研究通过混合钢纤维和竹纤维引入了一种新型的高性能混凝土(UHPC)方法,为传统的纤维增强UHPC提供了一种可持续的替代方案,同时又不影响生物降解材料的机械完整性。以不同长度的竹纤维(6 mm、12 mm和18 mm)与钢纤维结合,在纤维总体积含量为2.0 %的条件下制备了UHPC,并对其宏观和微观性能进行了评价。结果表明,将掺量为0.5 % -1.5 %的12 mm竹纤维与掺量为1.5 % -0.5 %的钢纤维混合可达到最佳平衡,既能提高UHPC的抗弯强度和韧性,又能最大限度地降低天然纤维对UHPC抗压强度的影响。由于其固有的吸湿性,竹纤维减少了UHPC的干燥收缩率,在基体内形成了一个水分缓冲系统,延长了内部固化时间,减少了体积变化。微观上,竹纤维增加了UHPC的孔隙度,促进了持续水化和水化硅酸钙凝胶的形成。钢纤维提供了维持UHPC机械性能所需的结构刚度和抗裂性,形成了协同加固机制。本研究通过天然纤维和合成纤维的互补使用,在高性能混凝土中开创了绿色加固策略,为进一步开发高性能、环保的混凝土材料奠定了基础。
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来源期刊
Construction and Building Materials
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.
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