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<p>MgO/hydromagnesite (HY) binders are low-carbon magnesia binders that, depending on the sourcing of the magnesium, can be CO<sub>2</sub> neutral. While several studies published in the last decade dealt with hydration mechanisms and properties of pastes and mortars, no studies on concrete using MgO/HY blends have been ever reported in the open literature.</p><p>In this paper, structural concrete was prepared with MgO/HY binder and its mechanical properties and volume changes were investigated. The compressive strength and the Young’s modulus were similar to those of a Portland-limestone cement (CEM II/A-LL 42.5&#xa0;N) based concrete of strength class C25/30, with comparatively higher early strength (&gt; 20&#xa0;MPa at 1&#xa0;day and &gt; 32&#xa0;MPa at 7&#xa0;days). Curing at 90% RH resulted in mass gain and expansion of concrete prisms, about 160&#xa0;µm/m after 6&#xa0;months. Drying at 70% and 57% RH led to shrinkage, however lower than for the reference concrete. Drying creep was similar at 90% and 70% RH and substantially lower than for the reference concrete. Based on this preliminary assessment, the MgO/HY binder could be suitable for structural concrete, but extensive experimental campaigns about long-term mechanical properties, volume changes and durability need first to be carried out.</p>

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Mechanical properties and volume changes of structural concrete with MgO/hydromagnesite binder

  • 期刊论文

  • 发表日期：

    2026年4月12日

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  • Pietro Lura,
  • Alexander German,
  • Nikolajs Toropovs,
  • Davide Sirtoli,
  • Frank Winnefeld

摘要

MgO/hydromagnesite (HY) binders are low-carbon magnesia binders that, depending on the sourcing of the magnesium, can be CO2 neutral. While several studies published in the last decade dealt with hydration mechanisms and properties of pastes and mortars, no studies on concrete using MgO/HY blends have been ever reported in the open literature.

In this paper, structural concrete was prepared with MgO/HY binder and its mechanical properties and volume changes were investigated. The compressive strength and the Young’s modulus were similar to those of a Portland-limestone cement (CEM II/A-LL 42.5 N) based concrete of strength class C25/30, with comparatively higher early strength (> 20 MPa at 1 day and > 32 MPa at 7 days). Curing at 90% RH resulted in mass gain and expansion of concrete prisms, about 160 µm/m after 6 months. Drying at 70% and 57% RH led to shrinkage, however lower than for the reference concrete. Drying creep was similar at 90% and 70% RH and substantially lower than for the reference concrete. Based on this preliminary assessment, the MgO/HY binder could be suitable for structural concrete, but extensive experimental campaigns about long-term mechanical properties, volume changes and durability need first to be carried out.