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Abstract

Lowering the environmental impact, and moving away from a reliance on cement based binders, is a key challenge of the construction industry. Dolomitic lime binders are produced at lower temperatures than cement, re-adsorb released CO2 during strengthening, and are recognised for their superior permeability, flexibility and resilience. While dolomite consists of alternating layers of magnesium and calcium the distribution in dolomitic lime is not yet fully understood. Here we combine experimental and computational methods to confirm that dolomite phase separates into lime and periclase during thermal decomposition. Raman inactivity of decomposed dolomite agrees with XRD studies suggesting phase separation. Our results rule out the formation of mixed phase oxides and predict an upper bound for bulk and surface substitution defect concentrations. Transferred to study macroscopic models of lime mortars these findings indicate that only the pure phases need be considered and that for the construction industry superior artificial mortars should be obtained from mixing fine powders of pure magnesium and calcium hydroxide.
Original languageEnglish
Pages (from-to)16066-16072
Number of pages7
JournalRSC Advances
Volume6
Issue number19
Early online date29 Jan 2016
DOIs
Publication statusPublished - 2016

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Lime
Construction industry
Mortar
Chemical analysis
Binders
Magnesium
Cements
Magnesium Hydroxide
Calcium Hydroxide
Hydrated lime
Computational methods
Phase separation
Powders
Oxides
Environmental impact
Calcium
Pyrolysis
Substitution reactions
Defects
lime

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An experimental and computational study to resolve the composition of dolomitic lime. / Grant, J.; Pesce, G. L.; Ball, R. J.; Molinari, M.; Parker, S. C.

In: RSC Advances, Vol. 6, No. 19, 2016, p. 16066-16072.

Research output: Contribution to journalArticle

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AU - Pesce, G. L.

AU - Ball, R. J.

AU - Molinari, M.

AU - Parker, S. C.

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AB - Lowering the environmental impact, and moving away from a reliance on cement based binders, is a key challenge of the construction industry. Dolomitic lime binders are produced at lower temperatures than cement, re-adsorb released CO2 during strengthening, and are recognised for their superior permeability, flexibility and resilience. While dolomite consists of alternating layers of magnesium and calcium the distribution in dolomitic lime is not yet fully understood. Here we combine experimental and computational methods to confirm that dolomite phase separates into lime and periclase during thermal decomposition. Raman inactivity of decomposed dolomite agrees with XRD studies suggesting phase separation. Our results rule out the formation of mixed phase oxides and predict an upper bound for bulk and surface substitution defect concentrations. Transferred to study macroscopic models of lime mortars these findings indicate that only the pure phases need be considered and that for the construction industry superior artificial mortars should be obtained from mixing fine powders of pure magnesium and calcium hydroxide.

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