Advanced calcareous ceramics via novel green processing and supercritical carbonation

E. Farahi*, P. Purnell, N. R. Short

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This project is aimed at investigating the potential for using a supercritical carbonation process in combination with other novel processing techniques to fabricate a new class of ceramic composites from a variety of calcium-based precursor materials, including lime and cement. The process has the potential to help mitigate the CO 2 impact of the manufacture of cements by re-combining some of the CO 2 emitted. Compression moulding techniques, as used for mass-produced polymer components, are used to fabricate green forms, which are then treated with supercritical CO 2. Considerable development of the moulding process and mix design was required to produce viable green forms. The effect of the treatment on the microstructure and engineering properties of specimens was investigated using XRD and 4-point bending tests. XRD tests confirmed that complete depletion of calcium hydroxide and anhydrous species was achieved during the carbonation process in most samples, with consequent formation of calcite. Mechanical testing indicated that considerable improvement in flexural strength could be achieved by carbonation, well over and above that which would be expected during conventional water curing. Results also indicated that 'full carbonation' as indicated by calcium hydroxide depletion is not a reliable indicator for achieving high strength; the mix design plays a critically important role.

Original languageEnglish
Title of host publicationSustainable Construction Materials and Technologies - International Conference on Sustainable Construction Materials and Technologies
Pages359-366
Number of pages8
Publication statusPublished - 1 Dec 2007
EventInternational Conference on Sustainable Construction Materials and Technologies - Coventry, United Kingdom
Duration: 11 Jun 200713 Jun 2007

Conference

ConferenceInternational Conference on Sustainable Construction Materials and Technologies
CountryUnited Kingdom
CityCoventry
Period11/06/0713/06/07

Fingerprint

Carbonation
Hydrated lime
Processing
Cements
Compression molding
Mechanical testing
Calcite
Bending tests
Lime
Molding
Bending strength
Curing
Calcium
Microstructure
Composite materials
Polymers
Water

Cite this

Farahi, E., Purnell, P., & Short, N. R. (2007). Advanced calcareous ceramics via novel green processing and supercritical carbonation. In Sustainable Construction Materials and Technologies - International Conference on Sustainable Construction Materials and Technologies (pp. 359-366)
Farahi, E. ; Purnell, P. ; Short, N. R. / Advanced calcareous ceramics via novel green processing and supercritical carbonation. Sustainable Construction Materials and Technologies - International Conference on Sustainable Construction Materials and Technologies. 2007. pp. 359-366
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Farahi, E, Purnell, P & Short, NR 2007, Advanced calcareous ceramics via novel green processing and supercritical carbonation. in Sustainable Construction Materials and Technologies - International Conference on Sustainable Construction Materials and Technologies. pp. 359-366, International Conference on Sustainable Construction Materials and Technologies, Coventry, United Kingdom, 11/06/07.

Advanced calcareous ceramics via novel green processing and supercritical carbonation. / Farahi, E.; Purnell, P.; Short, N. R.

Sustainable Construction Materials and Technologies - International Conference on Sustainable Construction Materials and Technologies. 2007. p. 359-366.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Farahi E, Purnell P, Short NR. Advanced calcareous ceramics via novel green processing and supercritical carbonation. In Sustainable Construction Materials and Technologies - International Conference on Sustainable Construction Materials and Technologies. 2007. p. 359-366