A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Morphological Evolution of Calcium Carbonate Crystals in Dry Hydrated Lime Mortar
https://orcid.org/http://orcid.org/0000-0003-3928-4402
https://orcid.org/http://orcid.org/0000-0002-2358-1261
Heritage air lime mortars are highly porous, flexible and allow the egress of moisture from the structure by the property of breathability. Commercial dry hydrated lime mortar is widely used to repair heritage structures. The binder is manufactured by adding water to the crushed quicklime; hydrated lime gets converted to calcium carbonate (CaCO3) by absorbing atmospheric carbon dioxide. CaCO3 exhibits different morphology such as calcite (most stable form), vaterite (least stable form) and aragonite, depending on the local conditions of temperature, pH, carbon dioxide concentration etc. Acicular aragonite can be present during the initial stages of carbonation. Amorphous Calcium Carbonate (ACC) could also exist initially as small spheres.
The present study focuses on carbonating dry hydrated lime mortar in accelerated carbonation condition (3% CO2) to investigate the effect of CO2 concentration in the morphology of calcium carbonate formed. The study examines the extent of carbonation at various ages of the mortar specimens using the Phenolphthalein indicator test and X-Ray Diffraction (XRD). Morphology of the calcium carbonate crystals is examined using Scanning Electron Microscopy (SEM). The study is expected to provide insights into the relationship between CaCO3 polymorphism and carbonation condition in dry hydrated lime mortar mixes.
Morphological Evolution of Calcium Carbonate Crystals in Dry Hydrated Lime Mortar
https://orcid.org/http://orcid.org/0000-0003-3928-4402
https://orcid.org/http://orcid.org/0000-0002-2358-1261
Heritage air lime mortars are highly porous, flexible and allow the egress of moisture from the structure by the property of breathability. Commercial dry hydrated lime mortar is widely used to repair heritage structures. The binder is manufactured by adding water to the crushed quicklime; hydrated lime gets converted to calcium carbonate (CaCO3) by absorbing atmospheric carbon dioxide. CaCO3 exhibits different morphology such as calcite (most stable form), vaterite (least stable form) and aragonite, depending on the local conditions of temperature, pH, carbon dioxide concentration etc. Acicular aragonite can be present during the initial stages of carbonation. Amorphous Calcium Carbonate (ACC) could also exist initially as small spheres.
The present study focuses on carbonating dry hydrated lime mortar in accelerated carbonation condition (3% CO2) to investigate the effect of CO2 concentration in the morphology of calcium carbonate formed. The study examines the extent of carbonation at various ages of the mortar specimens using the Phenolphthalein indicator test and X-Ray Diffraction (XRD). Morphology of the calcium carbonate crystals is examined using Scanning Electron Microscopy (SEM). The study is expected to provide insights into the relationship between CaCO3 polymorphism and carbonation condition in dry hydrated lime mortar mixes.
Morphological Evolution of Calcium Carbonate Crystals in Dry Hydrated Lime Mortar
https://orcid.org/http://orcid.org/0000-0003-3928-4402
https://orcid.org/http://orcid.org/0000-0002-2358-1261
Heritage air lime mortars are highly porous, flexible and allow the egress of moisture from the structure by the property of breathability. Commercial dry hydrated lime mortar is widely used to repair heritage structures. The binder is manufactured by adding water to the crushed quicklime; hydrated lime gets converted to calcium carbonate (CaCO3) by absorbing atmospheric carbon dioxide. CaCO3 exhibits different morphology such as calcite (most stable form), vaterite (least stable form) and aragonite, depending on the local conditions of temperature, pH, carbon dioxide concentration etc. Acicular aragonite can be present during the initial stages of carbonation. Amorphous Calcium Carbonate (ACC) could also exist initially as small spheres.
The present study focuses on carbonating dry hydrated lime mortar in accelerated carbonation condition (3% CO2) to investigate the effect of CO2 concentration in the morphology of calcium carbonate formed. The study examines the extent of carbonation at various ages of the mortar specimens using the Phenolphthalein indicator test and X-Ray Diffraction (XRD). Morphology of the calcium carbonate crystals is examined using Scanning Electron Microscopy (SEM). The study is expected to provide insights into the relationship between CaCO3 polymorphism and carbonation condition in dry hydrated lime mortar mixes.
Morphological Evolution of Calcium Carbonate Crystals in Dry Hydrated Lime Mortar
RILEM Bookseries
Bokan Bosiljkov, Violeta (editor) / Padovnik, Andreja (editor) / Turk, Tilen (editor) / Anupama, V. A. (author) / Santhanam, Manu (author)
Historic Mortars International Conference ; 2022 ; Ljubljana, Slovenia
Conservation and Restoration of Historic Mortars and Masonry Structures ; Chapter: 37 ; 469-475
RILEM Bookseries ; 42
2023-06-08
7 pages
Article/Chapter (Book)
Electronic Resource
English
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