Phase evolution, characterisation, and performance of cement prepared in an oxy-fuel atmosphere
Author(s)
Zheng, L
Hills, TP
Fennell, P
Type
Journal Article
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.
Date Issued
2016-10-01
Date Acceptance
2016-04-11
Citation
Faraday Discussions, 2016, 192, pp.113-124
ISSN
1364-5498
Publisher
Royal Society of Chemistry
Start Page
113
End Page
124
Journal / Book Title
Faraday Discussions
Volume
192
Copyright Statement
This journal is © The Royal Society of Chemistry 2016
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Grant Number
EP/K021710/1
Subjects
Chemical Physics
0306 Physical Chemistry (Incl. Structural)
0904 Chemical Engineering
Publication Status
Published
Date Publish Online
2016-04-11