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<p>This study analyzes the performance of mortars reinforced with Amazonian natural fibers—coconut, curauá, sisal, and tucumã—under surface treatment with silane-siloxane. The treatment aimed to enhance fiber durability and compatibility with the cementitious matrix by reducing hydrophilicity and improving interfacial adhesion. Unreinforced mortar and mortar reinforced with polypropylene fibers were also studied for comparison. The research involved assessing the surface morphology of both treated and untreated natural fibers through Scanning Electron Microscopy (SEM) and the properties of fresh and hardened mortars, the latter considering specimens aged 28 and 365&#xa0;days. Mortar reinforcement was tested with 0.5, 1.0, and 1.5% fiber content. Capillary water absorption tests were conducted to evaluate the effectiveness of the hydrophobic treatment, and mechanical tests assessed the impact of fiber incorporation on compressive, flexural tensile, and bond tensile strengths. An analytical approach was implemented to complement the experimental results. The findings indicate that incorporating plant fibers causes significant changes in the fresh state, with increased fiber content resulting in reduced density and consistency index and increased air content. At 28&#xa0;days, higher fiber content was associated with decreased compressive and flexural tensile strength, while bond tensile strength remained adequate according to current standards. At 365&#xa0;days, there was an increase in compressive and flexural tensile strengths compared to the reference mortar. Compared to polypropylene fibers, Amazonian natural fibers exhibited compatible or superior properties. This research highlights the promising potential of plant fibers as a sustainable alternative for enhancing the performance of mortars.</p> Graphical abstract <p></p>

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Feasibility of Amazonian Natural Fibers as Sustainable Alternatives for Mortar Reinforcement

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Carlos Eduardo da Silva Monteiro Barbosa,
  • Thais Kauane Kemp,
  • Tainara Rodríguez da Silva,
  • Lidia Bruna Teles Gonzaga,
  • Francisco Roger Carneiro Ribeiro,
  • Rodrigo Cesar Pierozan,
  • Valeria Costa de Oliveira

摘要

This study analyzes the performance of mortars reinforced with Amazonian natural fibers—coconut, curauá, sisal, and tucumã—under surface treatment with silane-siloxane. The treatment aimed to enhance fiber durability and compatibility with the cementitious matrix by reducing hydrophilicity and improving interfacial adhesion. Unreinforced mortar and mortar reinforced with polypropylene fibers were also studied for comparison. The research involved assessing the surface morphology of both treated and untreated natural fibers through Scanning Electron Microscopy (SEM) and the properties of fresh and hardened mortars, the latter considering specimens aged 28 and 365 days. Mortar reinforcement was tested with 0.5, 1.0, and 1.5% fiber content. Capillary water absorption tests were conducted to evaluate the effectiveness of the hydrophobic treatment, and mechanical tests assessed the impact of fiber incorporation on compressive, flexural tensile, and bond tensile strengths. An analytical approach was implemented to complement the experimental results. The findings indicate that incorporating plant fibers causes significant changes in the fresh state, with increased fiber content resulting in reduced density and consistency index and increased air content. At 28 days, higher fiber content was associated with decreased compressive and flexural tensile strength, while bond tensile strength remained adequate according to current standards. At 365 days, there was an increase in compressive and flexural tensile strengths compared to the reference mortar. Compared to polypropylene fibers, Amazonian natural fibers exhibited compatible or superior properties. This research highlights the promising potential of plant fibers as a sustainable alternative for enhancing the performance of mortars.

Graphical abstract