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<p>In this study we present the synthesis and characterization of graphene oxide (GO) with distinct oxidation degrees, designated as ‘GO-1’ (less oxidized) and ‘GO-2’ (more oxidized), and their impact on water absorption and mechanical properties in cementitious composites. XRD analysis confirmed the complete oxidation phase in GO-2. Thermal analysis quantified oxygenated groups at 12% (m/m) for GO-1 and 35% (m/m) for GO-2. FTIR and Raman spectroscopy revealed heightened oxygenated group presence and increased structural disorder in GO-2, with a <i>D/G</i> intensity ratio of 1.12 for GO-2 compared to 0.98 for GO-1. SEM analysis confirmed large lamellar structures in GO-2. Incorporating GO-1 and GO-2 into cementitious composites resulted in significant changes in water absorption and mechanical properties. The composite with GO-1 reduced water absorption by 14%, while GO-2 increased it by 10%. Compressive strength for GO-1 reached 28 MPa, a 17% increase over GO-2 (24 MPa) and 3.7% higher than the control (27 MPa). Tensile strength for GO-1 was 3.0 MPa (7.1% higher than the control at 2.8 MPa), while GO-2 achieved 3.1 MPa, a 10.7% improvement over the control. Contact angle measurements further supported these trends, with GO-1 showing ~22% increase (indicating hydrophobicity) and GO-2 ~4% decrease (indicating hydrophilicity). These findings highlight the critical role of GO oxidation degree in tailoring cementitious composites for enhanced durability (reduced water absorption) or improved tensile strength, providing a pathway for optimizing material performance.</p>

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Tailoring water absorption and mechanical properties of cementitious composites by varying the oxidation degree of graphene

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • S Castro-Lopes,
  • A S Carvalho,
  • M V de Moura,
  • S Peres,
  • E Padrón-Hernández,
  • H J F Diógenes,
  • R A Berenguer

摘要

In this study we present the synthesis and characterization of graphene oxide (GO) with distinct oxidation degrees, designated as ‘GO-1’ (less oxidized) and ‘GO-2’ (more oxidized), and their impact on water absorption and mechanical properties in cementitious composites. XRD analysis confirmed the complete oxidation phase in GO-2. Thermal analysis quantified oxygenated groups at 12% (m/m) for GO-1 and 35% (m/m) for GO-2. FTIR and Raman spectroscopy revealed heightened oxygenated group presence and increased structural disorder in GO-2, with a D/G intensity ratio of 1.12 for GO-2 compared to 0.98 for GO-1. SEM analysis confirmed large lamellar structures in GO-2. Incorporating GO-1 and GO-2 into cementitious composites resulted in significant changes in water absorption and mechanical properties. The composite with GO-1 reduced water absorption by 14%, while GO-2 increased it by 10%. Compressive strength for GO-1 reached 28 MPa, a 17% increase over GO-2 (24 MPa) and 3.7% higher than the control (27 MPa). Tensile strength for GO-1 was 3.0 MPa (7.1% higher than the control at 2.8 MPa), while GO-2 achieved 3.1 MPa, a 10.7% improvement over the control. Contact angle measurements further supported these trends, with GO-1 showing ~22% increase (indicating hydrophobicity) and GO-2 ~4% decrease (indicating hydrophilicity). These findings highlight the critical role of GO oxidation degree in tailoring cementitious composites for enhanced durability (reduced water absorption) or improved tensile strength, providing a pathway for optimizing material performance.