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Influence of polypropylene fiber reinforcement on tensile behavior and failure mode of tailings cemented paste backfill

Xin Chen, Xiuzhi Shi, Jian Zhou, Zhi Yu

Article (2019)

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Abstract

Tailings were used to prepare cemented paste backfill (CPB) reinforced with polypropylene (PP) fiber, and fiber content and fiber length were 0-20 % and 3-12 mm, respectively. The Brazilian indirect tensile strength tests, macrostructural and microstructural (SEM) failure mode analyses and nuclear magnetic resonance (NMR) tests were performed. The results demonstrate that PP fiber with high tensile strength can substantially enhance the tensile strength and ductility of CPB specimens. The fiber-reinforced CPB exhibits superior performance during the pre-peak and post-peak stages and can retain its residual strength after being broken. The fiber-reinforced CPB provided a higher secant Young's modulus and strain at peak stress than that of the unreinforced CPB. From the failure mode analysis, fiber was used to bridge the CPB microelements and combine these effectively with calcium silicate hydrate gelling. The governing failure mode of fiber is pulled out or pull off, through which fiber absorbs the tensile stress and energy. However, fiber is also believed to have confusion distribution in CPB because fiber cannot reach their fullstrain capacity, especially at the later curing stage. And the weak structural layers in the CPB can also beformed, and the higher tensile strength is not achieved with the additional fiber content or longer fiber length.The optimal fiber content in this study is recommended to be 0.15 %, and it's better to choose 6 or 9 mm fiber. Moreover, fiber can reduce the original porosity by 10.72 %, but only has a slight influence on the pore size. The decrease in porosity helps increase the tensile strength of the fiber-reinforced CPB.

Uncontrolled Keywords

Tailings, fiber-reinforced, cemented paste backfill, Brazilian indirect tensile strength

Subjects: 1400 Mining and mineral processing > 1400 Mining and mineral processing
Department: Department of Civil, Geological and Mining Engineering
Research Center: RIME - Research Institute on Mines and the Environment UQAT-Polytechnique
Funders: National Key R&D Program of China, National Natural Science Foundation Project of China, Fundamental Research Funds for the Central Universities of Central South University, China Scholarship Council (CSC)
Grant number: 2017YFC0602902, 41807259, 51874350, 2016zztx096
PolyPublie URL: https://publications.polymtl.ca/4820/
Journal Title: IEEE Access (vol. 7)
Publisher: IEEE
DOI: 10.1109/access.2019.2919480
Official URL: https://doi.org/10.1109/access.2019.2919480
Date Deposited: 20 Jul 2021 12:17
Last Modified: 17 Nov 2022 05:26
Cite in APA 7: Chen, X., Shi, X., Zhou, J., & Yu, Z. (2019). Influence of polypropylene fiber reinforcement on tensile behavior and failure mode of tailings cemented paste backfill. IEEE Access, 7, 69015-69026. https://doi.org/10.1109/access.2019.2919480

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