Hua Zhao , Jie Tang , Tao Zhou , Ziwei Li , Tianwang Xiong , Baomin Wang
{"title":"Effects of hybrid steel/bamboo fibers on the static performance and microstructure of UHPC","authors":"Hua Zhao , Jie Tang , Tao Zhou , Ziwei Li , Tianwang Xiong , Baomin Wang","doi":"10.1016/j.conbuildmat.2024.139326","DOIUrl":null,"url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139326"},"PeriodicalIF":7.4000,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Construction and Building Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0950061824044684","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
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.
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.