Production of calcium sulfoaluminate cements using waste materials

Date

2019-06-16

Author

Canbek, Ogulcan
Erdoğan, Sinan Turhan

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The high environmental impact of ordinary portland cement (OPC) is due to its main mineral,alite (C3S), which needs elevated kiln temperatures and high lime content to form. In calciumsulfoaluminate (CS̄A) clinkers, ye’elimite (C4A3S̄ ) forms as the main clinker phase and alite doesnot. Ye’elimite can form at 200-250 °C lower temperatures and has ~40 % lower lime contentthan alite which makes CS̄A cements a promising alternative to OPC. Bauxite is typically used asa raw material to satisfy the great alumina demand of ye’elimite formation. However, bauxite isexpensive as it is not abundant and is in demand by aluminum manufacturers. Hence,incorporation of industrial wastes, particularly aluminous ones, into CS̄A cements can helpmaintain their appeal.This study used limestone, bauxite and gypsum as natural raw materials and some high-volumeindustrial wastes in Turkey, a fly ash, red mud, and desulfogypsum, to produce CS̄A cements. Flyash and red mud were incorporated in the clinker raw meal to minimize the use of bauxite.Desulfogypsum was added to the ground clinker as a source of calcium sulfate. Different CS̄Aclinkers were produced by varing calcination conditions (kiln temperature and residence time)and using various raw mixtures. CS̄A cements and mortars produced with or without variousadmixtures were investigated using strength tests, isothermal calorimetry, X-ray diffraction(XRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). 1-dcompressive strengths of 15 MPa and 28-d strengths exceeding 35-40 MPa could be reachedusing cements containing > 50 % industrial waste and as low as 10 % bauxite. Early strength gainis due to ye’elimite hydration, which produces ettringite. Belite hydration which ordinarilyincreases late strength can be accelerated with admixtures. XRD and TGA also indicate someettringite decomposition due to carbonation.

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https://hdl.handle.net/11511/83826

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Unverified, Conference / Seminar

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Citation Formats

O. Canbek and S. T. Erdoğan, “Production of calcium sulfoaluminate cements using waste materials,” 2019, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/83826.