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Volume 192, 2016
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Phase evolution, characterisation, and performance of cement prepared in an oxy-fuel atmosphere

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Abstract

Cement manufacture is one of the major contributors (7–10%) to global anthropogenic CO2 emissions. Carbon capture and storage (CCS) has been identified as a vital technology for decarbonising the sector. Oxy-fuel combustion, involving burning fuel in a mixture of recycled CO2 and pure O2 instead of air, makes CO2 capture much easier. Since it combines a theoretically lower energy penalty with an increase in production, it is attractive as a CCS technology in cement plants. However, it is necessary to demonstrate that changes in the clinkering atmosphere do not reduce the quality of the clinker produced. Clinkers were successfully produced in an oxy-fuel atmosphere using only pure oxides as raw materials as well as a mixture of oxides and clay. Then, CEM I cements were prepared by the addition of 5 wt% gypsum to the clinkers. Quantitative XRD and XRF were used to obtain the phase and elemental compositions of the clinkers. The particle size distribution and compressive strength of the cements at 3, 7, 14, and 28 days' ages were tested, and the effect of the particle size distribution on the compressive strength was investigated. Additionally, the compressive strength of the cements produced in oxy-fuel atmospheres was compared with those of the cement produced in air and commercially available CEMEX CEM I. The results show that good-quality cement can be successfully produced in an oxy-fuel atmosphere and it has similar phase and chemical compositions to CEM I. Additionally, it has a comparable compressive strength to the cement produced in air and to commercially available CEMEX CEM I.

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Publication details

The article was received on 29 Feb 2016, accepted on 11 Apr 2016 and first published on 11 Apr 2016


Article type: Paper
DOI: 10.1039/C6FD00032K
Citation: Faraday Discuss., 2016,192, 113-124
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    Phase evolution, characterisation, and performance of cement prepared in an oxy-fuel atmosphere

    L. Zheng, T. P. Hills and P. Fennell, Faraday Discuss., 2016, 192, 113
    DOI: 10.1039/C6FD00032K

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