Supercritical carbonation of calcareous composites:influence of mix design


This work combined compression moulding with subsequent super-critical carbonation treatment (100 bar, 60 °C, 24 h) to fabricate cement and/or lime based ceramic composites with various aggregates. Composites were examined using mechanical testing, XRD, He pycnometry and thin-section petrography. Composites with lime-only binders were significantly weaker than those with cement-lime binders regardless of the degree of carbonation. Flexural strengths in excess of >10 MPa were routinely achieved in large (>100 mm) specimens. Aggregate type (calcareous vs. siliceous) had a significant effect on the microstructure and properties of the composites. Calcareous aggregates appear to augment the strength enhancement effected during super-critical carbonation by encouraging preferential precipitation of calcite at the binder-aggregate interface.

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Divisions: Engineering & Applied Sciences > Engineering Systems & Management
Uncontrolled Keywords: super-critical carbonation,mechanical processing,lime,cement,flexural testing,petrography
Full Text Link: http://eprints. ... _coversheet.pdf
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PURE Output Type: Article
Published Date: 2013-10-31
Published Online Date: 2013-06-21
Authors: Farahi, Elham
Purnell, Phil
Short, Neil R.

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