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ORIGINAL RESEARCH article

Front. Mater.
Sec. Structural Materials
Volume 11 - 2024 | doi: 10.3389/fmats.2024.1513872

Study on Acoustic Emission Characteristics under Compression and Fractal Dimension of Pore Structure of Polyvinyl Alcohol Fiber Engineered Cementitious Composites

Provisionally accepted
Li Yueqiang Li Yueqiang 1Huang Xin Huang Xin 1*Zhao Yangcan Zhao Yangcan 2*
  • 1 Institute of Disaster Prevention, Sanhe, China
  • 2 China University of Mining and Technology, Beijing, Beijing, China

The final, formatted version of the article will be published soon.

    Fiber adding to engineered cementitious composites (ECC) can effectively improve the performance of material. This study used the acoustic emission (AE) technique to study the influence of polyvinyl alcohol (PVA) fibre content on compressive strength and damage evolution of ECC and used the fractal theory to analyse the pore structure of PVA-ECC, which innovatively explored the mechanical properties and durability of PVA-ECC from macro and micro perspectives. In terms of mechanical properties, the compressive strength of ECC with 1% PVA volume content was the highest. PVA changed the compression damage mechanism of ECC, showing a decrease in internal tensile cracking and an increase in shear cracking through RA-AF values. ECC developed from brittle damage to ductile damage. In terms of microstructure and durability, ECC with 1% PVA volume content had the best impermeability and pore structure fractal characteristics, and PVA had a great influence on the fractal characteristics of transition pores and capillary pores. The fractal dimension had a good correlation with porosity, total pore volume, most probable aperture, compressive strength and chloride diffusion coefficient, indicating that the mechanical strength and impermeability of ECC were closely related to the complex spatial structure and distribution characteristics of pores. The fractal dimension can be used to comprehensively characterise the mechanical properties and durability of ECC.

    Keywords: Polyvinyl alcohol fiber, ringing counts, RA-AF, Pore structure, fractal dimension

    Received: 19 Oct 2024; Accepted: 03 Dec 2024.

    Copyright: © 2024 Yueqiang, Xin and Yangcan. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Huang Xin, Institute of Disaster Prevention, Sanhe, China
    Zhao Yangcan, China University of Mining and Technology, Beijing, Beijing, 100083, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.