Micro‐Raman spectroscopy investigation of the carbonation reaction in a lime paste produced with a traditional technology

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.

Intrinsic physicochemical interactions of calcium hydroxide‐based medications

“…It has been reported that when CH has left in an open container prolonged time, the reaction of carbonatation has formed about 30% (wt%) of the medication after 1 month (Cohen & Lasfargues, 1988). It has been reported that the CH mass have almost fully carbonatation after 16 weeks (Ševčík et al, 2016). However, it has been reported that 90% of the CH remained unconverted into CaCO 3 after 6 weeks within the root canal in vivo (Kwon et al, 2004).…”

“…These ions generate to introduce hard tissue formation on vital tissue and the antibacterial effect on bacteria (Estrela & Pesce, 1996). Moreover, Ca 2+ ions interact with atmospheric or tissue‐related carbon dioxide (CO 2 ) or carbonate ions (CO 3− ) in an aqueous medium (Ševčík et al, 2016). Therefore, Ca 2+ ions come into contact with vital tissue calcium carbonate salt is formed which is called carbonatation (Kwon, Fujishima, & Imai, 2004).…”

“…Raman spectroscopy followed by XRD analysis has been utilized to follow the carbonatation reaction of CH in literature (Ševčík et al, 2016). Raman spectroscopy was used to investigate within CH based root canal medications interactions in the present study.…”

Applications of Raman spectroscopy in art and archaeology

“…Micro‐Raman spectroscopy was used by Ševčík et al to follow the carbonation reaction, up to 16 weeks, in lime paste produced with a traditional technology and cured under controlled conditions. Moreover, authors visualized the transformation of calcium hydroxide into calcium carbonate using Raman Imaging.…”

Real‐time monitoring of carbonation of hardened cement pastes using Raman microscopy

“…Raman microscopy has been used to study the hydration of C 3 S, 25 weathering of anhydrous cements, 26 and carbonation of lime paste. 27 However, its application for real-time imaging of cement-based materials remains under-explored. Torres-Carrasco et al 28 and Mikhailova et al 29 used Raman microscopy to study the hydration of Portland cement and polymerisation of alkali-activated cement and their results show that Raman microscopy is a promising tool for in situ observation of phase evolution in cement-based materials.…”