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Enhancing Biochar Impact on the Mechanical Properties of Cement-Based Mortar: An Optimization Study Using Response Surface Methodology for Particle Size and Content

Author

Listed:
  • Zhongrui Zhou

    (State Key Laboratory of Subtropical Building Science, School of Architecture, South China University of Technology, Guangzhou 510640, China)

  • Junsong Wang

    (State Key Laboratory of Subtropical Building Science, School of Architecture, South China University of Technology, Guangzhou 510640, China)

  • Kanghao Tan

    (School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China)

  • Yifei Chen

    (School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China)

Abstract

The utilization of agricultural waste, specifically biochar (BC), as an alternative material to conventional Portland cement offers substantial potential for enhancing sustainability within the construction industry. This study investigates how variations in BC particle size and content affect the properties of cement mortar using Response Surface Methodology (RSM). By manipulating BC’s content and particle size in the mortar mixture and analyzing the data with RSM, this study establishes response surface models to predict the relationship between BC characteristics and cement mortar strength. The results demonstrate that the optimal combination for enhancing the mechanical performance of the mortar is achieved when BC particles have a median particle diameter of 51.08 μm and a content of 2.69% of the mixture. Additionally, utilizing scanning electron microscopy (SEM), it is revealed that BC serves as a nucleation site for cement hydration, thereby inducing a more compact and dense microstructure within the cement mortar. Furthermore, BC particles contribute to enhancing the interfacial transition zone between the cement paste and aggregate, leading to increased compressive strength and fracture toughness of the mortar while simultaneously curbing crack propagation.

Suggested Citation

  • Zhongrui Zhou & Junsong Wang & Kanghao Tan & Yifei Chen, 2023. "Enhancing Biochar Impact on the Mechanical Properties of Cement-Based Mortar: An Optimization Study Using Response Surface Methodology for Particle Size and Content," Sustainability, MDPI, vol. 15(20), pages 1-16, October.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:20:p:14787-:d:1258230
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    References listed on IDEAS

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    1. Aan Mohammad Nusrat Aman & Anurita Selvarajoo & Teck Leong Lau & Wei-Hsin Chen, 2022. "Biochar as Cement Replacement to Enhance Concrete Composite Properties: A Review," Energies, MDPI, vol. 15(20), pages 1-20, October.
    2. Richard S. J. Tol, 2009. "The Economic Effects of Climate Change," Journal of Economic Perspectives, American Economic Association, vol. 23(2), pages 29-51, Spring.
    3. Rhoda Afriyie Mensah & Vigneshwaran Shanmugam & Sreenivasan Narayanan & Nima Razavi & Adrian Ulfberg & Thomas Blanksvärd & Faez Sayahi & Peter Simonsson & Benjamin Reinke & Michael Försth & Gabriel Sa, 2021. "Biochar-Added Cementitious Materials—A Review on Mechanical, Thermal, and Environmental Properties," Sustainability, MDPI, vol. 13(16), pages 1-27, August.
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