Micro‐Raman spectroscopy investigation of the carbonation reaction in a lime paste produced with a traditional technology. (20th April 2016)

• Record Type: Journal Article
• Authors: Ševčík, Radek; Mácová, Petra; Sotiriadis, Konstantinos; Pérez‐Estébanez, Marta; Viani, Alberto; Šašek, Petr
• Other Names: Łydżba‐Kopczyńska Barbara guestEditor.; Madariaga Juan Manuel guestEditor.
• Is Part Of: Journal of Raman spectroscopy. Volume 47:Number 12(2016)
• Page Start: 1452
• Page End: 1457
• Publication Date: 2016-04-20
• Subjects: micro‐Raman spectroscopy -- carbonation -- lime paste -- portlandite -- calcite; Raman spectroscopy -- Periodicals; 535.846
• DOI: 10.1002/jrs.4929
• Languages: English
• ISSNs: 0377-0486

Abstract

Abstract : Micro‐Raman spectroscopy has been used to follow the carbonation reaction up to 16 weeks in lime paste produced with a traditional technology and cured under controlled conditions. The transformation of calcium hydroxide into calcium carbonate was visualised using Raman Imaging. Calcite was the only crystalline CaCO3 polymorph detected under the conditions of the experiment. Three sharp zones of pure portlandite (Ca(OH)2 ), partially carbonated portlandite and calcite (CaCO3 ), could be distinguished. Amorphous calcium carbonate was determined within the carbonation front. The carbonation rate was found to be higher between first and second week of ageing. After this time, the rate was continuously decreasing until full carbonation was achieved. Results have been compared with those obtained from quantitative phase analysis with X‐rays powder diffraction. The proposed approach allows for a highly accurate description of the carbonation process in traditional lime‐based systems. In general, it can be applied to assess the effectiveness of treatments with inorganic agents promoting carbonation, and aimed at the conservation of cultural heritage objects. Copyright © 2016 John Wiley & Sons, Ltd. Abstract : In order to investigate the carbonation reaction in a lime paste produced with a traditional technology, micro‐Raman spectroscopy has been performed over transversal cross sections. The transformation of calcium hydroxide to calcium carbonate was visualised using Raman Imaging that allowed highly accurate description of the carbonation process in traditional lime systems. Micro‐Raman maps of calcite intensities of the lime paste specimens aged for 1 (a), 3 (b), 5 (c) and 12 (d) weeks.