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Title: Crystal morphology of the precipitated calcite crystals from accelerated carbonation of lime binders
Authors: Cizer, Özlem
Van Balen, Koenraad
Elsen, Jan
Van Gemert, Dionys #
Issue Date: Oct-2008
Publisher: University of Rome"La Sapienza"
Host Document: 2nd International Conference on Accelerated Carbonation for Environmental and Materials Engineering pages:149-158
Conference: Accelerated Carbonation for Environmental and Materials Engineering edition:2 location:Rome, Italy date:1-3 October 2008
Abstract: The morphology of calcium carbonate crystals has been studied at 20ºC during accelerated carbonation using 20% and 100 % volume CO2 concentrations at ~95% R.H. for lime pastes. Accelerated carbonation resulted in precipitation of calcite crystals with a habit and morphology similar on the sample surface but different along the sample thickness, depending on the lime type and CO2 concentration. Micrometer-sized rhombohedral calcite crystals precipitated on the sample surface in 100% CO2 atmosphere while the crystals were sub-micrometer-sized rhombohedral in the 20% CO2 atmosphere. Through the sample thickness, the carbonated profile was composed of scalenohedral calcite crystals with cracked/corroded surfaces that were disintegrated into nanometer-sized rhombohedra. It has been found that scalenohedral calcite undergoes a significant modification to rhombohedral when exposed to high CO2 concentrations. This can be explained with a dissolution-reprecipitation process under excess CO32- ions, leading to re-precipitation of nanometer-sized rhombohedral calcite crystals. Despite high CO2 concentrations, carbonation was not complete due to the heat released during carbonation and precipitated calcite crystals hindering the diffusion of CO2.
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Department of Civil Engineering - miscellaneous
Building Materials and Building Technology Section
Division of Geology
# (joint) last author

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