Synthesis of green calcium sulfoaluminate cements using an industrial symbiosis approach

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2022-9-1

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Tangüler Bayramtan, Meltem

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Portland cement (PC), the main binder of concrete, is an energy- and emission-intensive construction material. Calcium sulfoaluminate (CSA) cement can be seen as a sustainable alternative to PC because its production uses less energy and emits less CO2 to the environment. A potential problem facing the production of CSA cement is the cost and availability of alumina-bearing raw materials like bauxite. In this study, it was aimed to synthesize environmentally friendly CSA cement using an industrial symbiosis approach. In addition to the natural raw materials limestone and gypsum, the wastes/by-products from different industries i.e., Serox, ladle furnace slag, ceramic waste, and glass waste were used as raw materials for CSA production in the laboratory. The characterization of the CSA cements, their hydration behavior, and long-term performance were evaluated by various test techniques. As a result, three different CSA cements were successfully synthesized using at least 40% waste/by-product and it was determined that their main compounds were ye'elimite, anhydrite, merwinite, and fluorellestadite. Ettringite formation was detected as the main hydration product in all CSA cements and a compressive strength of over 30 MPa was obtained within one day. The ettringite that was formed seemed to carbonate in the long term. In addition, using Monte Carlo simulation technique, the CO2 emission of CSA cements were compared with that of PC, and considering all CSA cements, it was found out that the reductions up to 48% can be achieved.

Subject Keywords

CSA cement, Ye'elimite, Waste/By-product, Environmental assessment, Industrial symbiosis

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https://hdl.handle.net/11511/99641

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

M. Tangüler Bayramtan, “Synthesis of green calcium sulfoaluminate cements using an industrial symbiosis approach,” Ph.D. - Doctoral Program, Middle East Technical University, 2022.