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作者:

Chen, Yaojia (Chen, Yaojia.) | Jiao, Yubo (Jiao, Yubo.) | Yang, Hua (Yang, Hua.) | Ma, Fuzheng (Ma, Fuzheng.) | Meng, Jie (Meng, Jie.)

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EI Scopus

摘要:

The interfacial bond region between matrix and fibers is a non-negligible weak link that can significantly affect the mechanical properties of manufactured sand-based ultra-high-performance concrete (UHPMC). This study investigates the interfacial bond characteristics between steel fiber-UHPMC matrix using single-fiber pullout tests. Four variable parameters were considered: manufactured sand (MS) replacement ratio, stone powder content, fiber embedment length, and steel fiber geometry. Additionally, the microstructure of the steel fiber-UHPMC matrix interface was evaluated using backscattered electron microscopy (BSEM) and scanning electron microscopy (SEM). The results indicate that two typical failure modes including fiber pullout slip failure (in straight and hooked-end fibers) and fiber rupture failure (in corrugated fibers) were observed. The analysis of interfacial evaluation indicators shows that increasing the MS replacement ratio from 25 % to 100 % results in a decreasing trend in peak load, peak tensile stress, and energy consumption. Peak bond strength decreases with increasing embedment length. With the increase in stone powder content, the peak load, peak bond stress, and energy consumption increase initially and then decrease. Additionally, the interfacial failure mechanisms between straight/hooked-end steel fibers and the UHPMC matrix were further elucidated through bond-slip behavior characterization and microstructure analysis. Finally, a design-oriented bond-slip model was developed to predict the interfacial pull-out behavior of steel fiber -UHPMC matrix, showing favorable agreement between predicted and test results. These findings contribute to understanding the interfacial pullout behavior of steel fibers-UHPMC matrix, providing data reference for the performance optimization of UHPMC. © 2024 Elsevier Ltd

关键词:

Bond strength (materials) Steel powder metallurgy Slip forming Ultra-high performance concrete

作者机构:

  • [ 1 ] [Chen, Yaojia]State Key Laboratory of Bridge Engineering Safety and Resilience, Beijing University of Technology, Beijing, China
  • [ 2 ] [Chen, Yaojia]Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing, China
  • [ 3 ] [Jiao, Yubo]State Key Laboratory of Bridge Engineering Safety and Resilience, Beijing University of Technology, Beijing, China
  • [ 4 ] [Jiao, Yubo]Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing, China
  • [ 5 ] [Yang, Hua]State Key Laboratory of Bridge Engineering Safety and Resilience, Beijing University of Technology, Beijing, China
  • [ 6 ] [Yang, Hua]Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing, China
  • [ 7 ] [Ma, Fuzheng]State Key Laboratory of Bridge Engineering Safety and Resilience, Beijing University of Technology, Beijing, China
  • [ 8 ] [Ma, Fuzheng]Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing, China
  • [ 9 ] [Meng, Jie]State Key Laboratory of Bridge Engineering Safety and Resilience, Beijing University of Technology, Beijing, China
  • [ 10 ] [Meng, Jie]Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing, China

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来源 :

Construction and Building Materials

ISSN: 0950-0618

年份: 2024

卷: 446

7 . 4 0 0

JCR@2022

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SCOPUS被引频次: 2

ESI高被引论文在榜: 0 展开所有

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