Preparation and characterization of magnesium oxalate cement
Keywords:cement, alternative binders, carbon dioxide, oxalate, magnesium
The production of portland cement causes CO2 emissions. Alternative binders proposed in recent years often rely on scarce materials or use environment-threatening chemicals. Industrial waste CO2 can be bound into carbonate-based construction materials but the process is slow, and the final product is often a precast block, making concrete lose its advantage of being cast on site. This paper introduces magnesium oxalate cement, a novel acid-base binder made at room temperature from oxalic acid salts and magnesium oxide. The oxalate ion (C2O42-) has twice the equivalent carbon content of the carbonate ion and oxalic acid (H2C2O4) is one of the simplest multi-carbon chemicals to produce with captured CO2 using electrochemistry. The direct use of oxalic acid and two different oxalate salts are compared. The strength development and water stability of different magnesium oxalate cements are discussed based on their mineralogies and microstructures. Glushinskite (MgC2O4.2H2O) is the main reaction product in magnesium oxalate mortars, which are shown to reach 28-d compressive strengths up to 45 MPa.
Copyright (c) 2022 Sinan T. Erdoğan, Baki Aykut Bilginer, Oğulcan Canbek
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