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<p>To promote the sustainability of magnesium oxychloride cement (MOC) in construction applications, this study proposes a biomass-based modification strategy to optimize its rheological performance. Biomass bottom ash (BBA) and tannic acid (TA) were employed as eco-friendly additives, and their synergistic effects on MOC’s early-age properties were systematically investigated via rotational rheometry, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TG). The results show that BBA reduces plastic viscosity by physically diluting reactive phases, while its irregular morphology induces dynamic particle jamming at high shear rates, leading to shear thickening. Meanwhile, TA reduces the yield stress of MOC paste through electrostatic repulsion from its phenolic hydroxyl groups. The synergistic interaction between BBA and TA forms a "gel-wrapped particle-filling" structure. While this does not prevent the intrinsic shear-thickening at high shear rates, it modifies the paste’s initial structure, thereby improving its overall workability. Although the addition of BBA and TA leads to a reduction in 1d compressive strength due to decreased <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\hbox {5MgO}}\cdot \hbox {MgCl}_{\hbox {2}}\cdot \hbox {8H}_{\hbox {2}}{\hbox {O}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>5MgO</mtext> <mo>·</mo> <msub> <mtext>MgCl</mtext> <mtext>2</mtext> </msub> <mo>·</mo> <msub> <mtext>8H</mtext> <mtext>2</mtext> </msub> <mtext>O</mtext> </mrow> </math></EquationSource> </InlineEquation> crystals (phase 5) formation, this modification strategy effectively extends the workability window of MOC. This study offers a sustainable approach to enhance the constructability of MOC and promotes the large-scale utilization of biomass waste in green cementitious materials.</p>

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Magnesium oxychloride cement modification: linking rheological properties, microstructure, and early-age performance

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Jiayu Wu,
  • Fang Chen,
  • Hao Wang,
  • Jianhong Fang,
  • Lei Feng,
  • Chaoen Li,
  • Bowen Guan,
  • Xiaodong Wen

摘要

To promote the sustainability of magnesium oxychloride cement (MOC) in construction applications, this study proposes a biomass-based modification strategy to optimize its rheological performance. Biomass bottom ash (BBA) and tannic acid (TA) were employed as eco-friendly additives, and their synergistic effects on MOC’s early-age properties were systematically investigated via rotational rheometry, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TG). The results show that BBA reduces plastic viscosity by physically diluting reactive phases, while its irregular morphology induces dynamic particle jamming at high shear rates, leading to shear thickening. Meanwhile, TA reduces the yield stress of MOC paste through electrostatic repulsion from its phenolic hydroxyl groups. The synergistic interaction between BBA and TA forms a "gel-wrapped particle-filling" structure. While this does not prevent the intrinsic shear-thickening at high shear rates, it modifies the paste’s initial structure, thereby improving its overall workability. Although the addition of BBA and TA leads to a reduction in 1d compressive strength due to decreased \({\hbox {5MgO}}\cdot \hbox {MgCl}_{\hbox {2}}\cdot \hbox {8H}_{\hbox {2}}{\hbox {O}}\) 5MgO · MgCl 2 · 8H 2 O crystals (phase 5) formation, this modification strategy effectively extends the workability window of MOC. This study offers a sustainable approach to enhance the constructability of MOC and promotes the large-scale utilization of biomass waste in green cementitious materials.