Uniaxial tensile behavior and mechanism characterization of multi-scale fiber-reinforced cementitious materials

Authors

  • L. Li Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University - - College of Water Resources and Architectural Engineering, Northwest A&F University - Faculty of Infrastructure Engineering, Dalian University of Technology - State Key Laboratory of Green Building Materials, China Building Materials Academy https://orcid.org/0000-0003-3966-6363
  • M. Cao Faculty of Infrastructure Engineering, Dalian University of Technology https://orcid.org/0000-0002-7917-4710
  • Z. Li Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University - College of Water Resources and Architectural Engineering, Northwest A&F University https://orcid.org/0000-0002-6816-0575
  • W. Zhang State Key Laboratory of Green Building Materials, China Building Materials Academy https://orcid.org/0000-0002-9292-2867
  • D. Shi State Key Laboratory of Green Building Materials, China Building Materials Academy https://orcid.org/0000-0002-6175-2850
  • K. Shi School of Civil Engineering and Architecture, Zhengzhou University of Aeronautics https://orcid.org/0000-0001-9513-2679

DOI:

https://doi.org/10.3989/mc.2022.05521

Keywords:

Hybrid fiber, CaCO3 whisker, Cementitious material, Uniaxial tensile property, Calculations, Micro-mechanism

Abstract


The uniaxial tensile properties of multi-scale fiber-reinforced cementitious material (MSFRCM) with steel and polyvinyl alcohol (PVA) fibers and calcium carbonate whisker (CW) were studied. The results showed that CW improved the uniaxial tensile stiffness, strength, peak strain, and toughness of the steel-PVA hybrid fiber-reinforced cementitious material. The CW not only played a role in the small deformation stage but also improved the load holding capacity and toughness of the hybrid fiber-reinforced cementitious material during the large deformation stage. Computational models to assess the uniaxial tensile strength and toughness of the MSFRCM were established. Microstructure observations showed that the steel and PVA fibers formed a weak interfacial transition zone (ITZ) due to the “wall effect.” The CW effectively optimized the structure of the ITZ of the steel and PVA fibers through physical and chemical effects, such as filling, bridging, improving Ca(OH)2 orientation, and chemical effects. The steel fibers, PVA fibers, and CW in the MSFRCM bridged cracks at the macro, mesoscopic, and microscopic levels, respectively. As a result, we observed a fiber chain effect that improved the positive hybrid effect between the multi-scale fibers.

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Published

2022-02-17

How to Cite

Li, L. ., Cao, M. ., Li, Z. ., Zhang, W. ., Shi, D. ., & Shi, K. . (2022). Uniaxial tensile behavior and mechanism characterization of multi-scale fiber-reinforced cementitious materials. Materiales De Construcción, 72(345), e271. https://doi.org/10.3989/mc.2022.05521

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Research Articles

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