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<p>This study intends to develop a new mortar material with improving microstructural properties through the addition of nanomaterials in its composition. Among the nanomaterials with interesting features, graphitic carbon nitride (g-C₃N₄) stands out due to its graphene-like carbon-based structure, exceptional chemical and thermal stability, and outstanding electronic and optical properties. This metal-free polymeric material consists of layered (C₆N₇(NH₂)₃) monomers connected by NH bridges, where strong C–N covalent bonds and van der Waals interactions provide structural integrity. These unique features make g-C₃N₄ highly promising for applications in photocatalysis and structural nano-reinforcement. Thus, the present study evaluated the influence of exfoliated g-C<sub>3</sub>N<sub>4</sub> addition, with 0.25%, 0.50%, and 1.00% by weight of anhydrous cement, on the physical and mechanical properties of structural mortars. The microstructure of the exfoliated g-C<sub>3</sub>N<sub>4</sub> was characterized by transmission electron microscopy, thermogravimetric analysis, and Fourier transform infrared spectroscopy. Regarding the characterization of the mortars, the physical and mechanical properties were evaluated by flow table test, porosity and density measurements, SEM microscopy, and flexural and compressive strength tests. When the dosage of g-C<sub>3</sub>N<sub>4</sub> nanosheets was 1.0% by weight of cement, the compressive and flexural tensile strengths at 28 days increased by 16% and 18%, respectively. At the same time, the addition of the nanomaterials also seems to have reduced the workability and slightly increased the total porosity. When compared with regular cement mortar, despite negatively affecting the compaction of the structure, it reveals that the exfoliated g-C<sub>3</sub>N<sub>4</sub> addition could act as a reinforcing agent, improving the engineering performance of the cement composites making possible the production of lighter and stronger structures.</p>

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Influence of exfoliated g-C3N4 on the mechanical properties of structural mortars

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Izabella Katia Maciel Fernandes,
  • Bianca da Silva Lima Miconi Costa,
  • Leonardo Mayer Reis,
  • Raquel Kenya Ferreira Gonçalves de Oliveira,
  • José Marcio Fonseca Calixto,
  • Luiz Orlando Ladeira,
  • Tarcizo da Cruz Costa de Souza,
  • Manuel Houmard

摘要

This study intends to develop a new mortar material with improving microstructural properties through the addition of nanomaterials in its composition. Among the nanomaterials with interesting features, graphitic carbon nitride (g-C₃N₄) stands out due to its graphene-like carbon-based structure, exceptional chemical and thermal stability, and outstanding electronic and optical properties. This metal-free polymeric material consists of layered (C₆N₇(NH₂)₃) monomers connected by NH bridges, where strong C–N covalent bonds and van der Waals interactions provide structural integrity. These unique features make g-C₃N₄ highly promising for applications in photocatalysis and structural nano-reinforcement. Thus, the present study evaluated the influence of exfoliated g-C3N4 addition, with 0.25%, 0.50%, and 1.00% by weight of anhydrous cement, on the physical and mechanical properties of structural mortars. The microstructure of the exfoliated g-C3N4 was characterized by transmission electron microscopy, thermogravimetric analysis, and Fourier transform infrared spectroscopy. Regarding the characterization of the mortars, the physical and mechanical properties were evaluated by flow table test, porosity and density measurements, SEM microscopy, and flexural and compressive strength tests. When the dosage of g-C3N4 nanosheets was 1.0% by weight of cement, the compressive and flexural tensile strengths at 28 days increased by 16% and 18%, respectively. At the same time, the addition of the nanomaterials also seems to have reduced the workability and slightly increased the total porosity. When compared with regular cement mortar, despite negatively affecting the compaction of the structure, it reveals that the exfoliated g-C3N4 addition could act as a reinforcing agent, improving the engineering performance of the cement composites making possible the production of lighter and stronger structures.