Development of oxalate cements with dead-burned magnesia and calcium sulfoaluminate clinker

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2023-1-25

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Bilmez, Said Batuhan

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An emerging alternative to Portland cement, oxalate cement is a promising candidate for reducing the carbon footprint of the construction industry. Oxalic acid (OA) can be produced via direct electrochemical CO2 reduction, making carbon-neutral cement with OA possible. This study investigates the development of the mechanical, mineralogical, and microstructural properties of clay oxalate cement (COC) made with OA salt and dead-burned magnesia (DBM). Methods to prepare clay oxalate (CO), the OA salt used in this study, and to produce COC mixtures are proposed. Calcium sulfoaluminate (CSA) clinker was substituted for DBM to further lower the carbon footprint of COC mixtures. 28-day strengths of ~35 MPa were achieved in COC mortars with DBM, while those incorporating CSA reached ~30 MPa. The setting times of COC mixtures varied between 4 and 29 minutes. Mortars incorporating CSA set more rapidly than those with DBM. The reaction mechanismof COC pastes was studied using x-ray diffraction, pH measurement, thermogravimetric analysis, scanning electron microscopy, and mercury intrusion porosimetry. A magnesium oxalate hydrate, glushinskite, was observed inside the mostly amorphous medium of hydrated COC paste with DBM. COC mixturescontaining DBM were more water resistant than the samples made only with CSA clinker. The findings of this study and simple calculations suggest that hybrid COC mixtures containing equal amounts of DBM and CSA (CO/DBM/CSA=7.40/1.30/1.30, by mass) can provide medium strength, show sufficient resistance to water, as well as being carbon-neutral.

Subject Keywords

oxalate cement, carbon-neutral, magnesium, calcium sulfoaluminate

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https://hdl.handle.net/11511/102063

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

S. B. Bilmez, “Development of oxalate cements with dead-burned magnesia and calcium sulfoaluminate clinker,” M.S. - Master of Science, Middle East Technical University, 2023.