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Low-carbon magnesium potassium phosphate cement (MKPC) binder comprising caustic calcined magnesia and potassium hydroxide activated biochar from softwood technical lignin
Highlights MKPC for precast applications is possible using CCM MgO & KOH-activated Kraft lignin biochar. KOH activation increases biochar's surface area and pore size. Activated lignin biochar alters MKPC pore structure and size distribution. Biochar augmentation (5 wt-%) enhances MKPC material properties and sustainability.
Abstract Biochar augmentation in cementitious materials is attractive for enhancing the products' mechanical properties and improving sustainability. Softwood technical lignin biochar (5 wt-%) was used to augment MKPC as a replacement material, with increased surface area through KOH activation. Hard-burned (1000 °C) MgO was used as precursor. XRD and SEM-EDX analyses showed “struvite-K” as the primary component of the MKPC materials. MKPC materials including the 2-hour KOH-activated biochar showed the lowest porosity, highest strength and stiffness. Replacing MKPC with KOH-activated biochar can increase strength properties and reduce MKPC binder usage, providing a sustainable approach for precast applications.
Low-carbon magnesium potassium phosphate cement (MKPC) binder comprising caustic calcined magnesia and potassium hydroxide activated biochar from softwood technical lignin
Highlights MKPC for precast applications is possible using CCM MgO & KOH-activated Kraft lignin biochar. KOH activation increases biochar's surface area and pore size. Activated lignin biochar alters MKPC pore structure and size distribution. Biochar augmentation (5 wt-%) enhances MKPC material properties and sustainability.
Abstract Biochar augmentation in cementitious materials is attractive for enhancing the products' mechanical properties and improving sustainability. Softwood technical lignin biochar (5 wt-%) was used to augment MKPC as a replacement material, with increased surface area through KOH activation. Hard-burned (1000 °C) MgO was used as precursor. XRD and SEM-EDX analyses showed “struvite-K” as the primary component of the MKPC materials. MKPC materials including the 2-hour KOH-activated biochar showed the lowest porosity, highest strength and stiffness. Replacing MKPC with KOH-activated biochar can increase strength properties and reduce MKPC binder usage, providing a sustainable approach for precast applications.
Low-carbon magnesium potassium phosphate cement (MKPC) binder comprising caustic calcined magnesia and potassium hydroxide activated biochar from softwood technical lignin
Opara, Emmanuel Uchechukwu (author) / Karthäuser, Johannes (author) / Köhler, Robert (author) / Kowald, Torsten (author) / Koddenberg, Tim (author) / Mai, Carsten (author)
2023-07-09
Article (Journal)
Electronic Resource
English
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