RT Journal Article
T1 Influence of additions of synthetic anhydrous calcium carbonate polymorphs on nanolime carbonation
A1 Sevcik, Radek
A1 Mácová, Petra
A1 Viani, Alberto
A1 Pérez Estébanez, Marta
AB The influence of synthetic anhydrous calcium carbonate polymorphs, calcite, vaterite and aragonite, on carbonation of nanolime suspension, has been investigated. The higher rates of carbonation observed after 7 days in mixtures containing vaterite and aragonite particles, found explanation in the control exerted by heterogeneous nucleation on the water-mediated reaction mechanism and in the enhanced carbon dioxide diffusivity in the sample volume, both facilitated by the higher specific surface of the powders and the microporous sample fabric. Introduction of synthetic calcium carbonate allowed for exerting control on formed polymorphs, subverting the order of their (meta-)stability. The peculiar microstructure obtained by adding aragonite rod-like particles, mitigates the propagation of desiccation cracks (which impair continuity of the carbonated nanolime film). The mechanism, although still not completely understood, likely involves the regulation of evaporation of liquid fraction and redistributionof the tensional stresses during drying and nanolime crystallization. The obtained results provide new insights into the crystallization of carbonates from nanolime particles and may help in the design of innovative compatible products for consolidation of lime-based materials and carbon dioxide sequestration.
PB Elsevier
YR 2019
FD 2019
LK https://hdl.handle.net/20.500.14352/114358
UL https://hdl.handle.net/20.500.14352/114358
LA eng
DS Docta Complutense
RD 18 abr 2025