Influence of water vapour and carbon dioxide on free lime during storage at 80°C, studied by Raman spectroscopy

Dubina, Elina; Korat, Lidija; Black, Leon; Strupi-Šuput, J.; Plank, Johann

doi:10.1016/j.saa.2013.04.033

Cited by 70 publications

(50 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is noteworthy that in a recent study [76] authors have investigated the effect of water vapor and CO 2 on portlandite by Raman Spectroscopy and have shown the presence of amorphous CC if RH < 20%, metastable vaterite and aragonite if 20% < RH < 80% and calcite for higher RH-values.…”

Section: Tga-dtg-ms and Xrd Characterizationmentioning

confidence: 99%

Investigation of the carbonation mechanism of CH and C-S-H in terms of kinetics, microstructure changes and moisture properties

Morandeau

Thiéry

Dangla

2014

Cement and Concrete Research

707

285

View full text Add to dashboard Cite

The purpose of this article is to investigate the carbonation mechanism of CH and C-S-H within type-I cement-based materials in terms of kinetics, microstructure changes and water released from hydrates during carbonation. Carbonation tests were performed under accelerated conditions (10% CO 2 , 25• C and 65± 5% RH). Carbonation profiles were assessed by destructive and non-destructive methods such as phenolphthalein spray test, thermogravimetric analysis, and mercury intrusion porosimetry (destructive), as well as gamma-ray attenuation (non-destructive). Carbonation penetration was carried out at different ages from 1 to 16 weeks of CO 2 exposure on cement pastes of 0.45 and 0.6 w/c, as well as on mortar specimens (w/c = 0.50 and s/c = 2). Combining experimental results allowed us to improve the understanding of C-S-H and CH carbonation mechanism. The variation of molar volume of C-S-H during carbonation was identified and a quantification of the amount of water released during CH and C-S-H carbonation was performed.

show abstract

Section: Tga-dtg-ms and Xrd Characterizationmentioning

confidence: 99%

Investigation of the carbonation mechanism of CH and C-S-H in terms of kinetics, microstructure changes and moisture properties

Morandeau

Thiéry

Dangla

2014

Cement and Concrete Research

707

285

View full text Add to dashboard Cite

show abstract

“…The formation of aragonite or vaterite rather than calcite in the early stages of the reaction may be associated with an intermediate relative humidity reached within the sample (Dubina et al, 2013) or a high concentration of magnesium present in the pore solution at early times of curing. Magnesium has a significant influence on calcium carbonate precipitation, and can stabilise amorphous carbonates, aragonite and/or vaterite when its concentration is sufficiently high (Falini et al, 1996;Loste et al, 2003).…”

Section: Isothermal Calorimetrymentioning

confidence: 99%

Alkali-activated slag cements produced with a blended sodium carbonate/sodium silicate activator

Bernal¹,

Nicolas²,

Provis³

et al. 2015

Advances in Cement Research

View full text Add to dashboard Cite

An alkali-activated slag cement produced with a blend of sodium carbonate/sodium silicate activator was characterised. This binder hardened within 12 h and achieved a compressive strength of 20 MPa after 24 h of curing under ambient conditions, which is associated with the formation of an aluminium substituted calcium silicate hydrate as the main reaction product. Carbonates including pirssonite, vaterite, aragonite and calcite were identified along with the zeolites hydroxysodalite and analcime at early times of reaction. The partial substitution of sodium carbonate by sodium silicate reduces the concentration of carbonate ions in the pore solution, increasing the alkalinity of the system compared with a solely carbonate-activated paste, accelerating the kinetics of reaction and supplying additional silicate species to react with the calcium dissolving from the slag as the reaction proceeds. These results demonstrate that this blend of activators can be used effectively for the production of high-strength alkali-activated slag cements, with a microstructure comparable to what has been identified in aged sodium-carbonate-activated slag cements but without the extended setting time reaction usually identified when using this salt as an alkali activator.

show abstract

“…In the complex system of Portland cement studied by Corvisier et al , all three calcium carbonate polymorphs (calcite, aragonite and vaterite) were detected and their distribution along the main CO 2 diffusion direction was mapped at the millimetric scale. The formation of crystalline CaCO 3 polymorphs in lime paste was found to be strongly dependent on relative humidity . The concurrently formation of calcite, vaterite and aragonite was observed between 20 and 60% RH at 80 °C .…”

Section: Resultsmentioning

confidence: 92%

“…It is well known, that reactions conditions (e.g. temperature, pH, humidity, presence of additives) play a crucial role in the precipitation of the CaCO 3 polymorphs . In the complex system of Portland cement studied by Corvisier et al , all three calcium carbonate polymorphs (calcite, aragonite and vaterite) were detected and their distribution along the main CO 2 diffusion direction was mapped at the millimetric scale.…”

Section: Resultsmentioning

confidence: 99%

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

Ševčík

Mácová

Sotiriadis

et al. 2016

J Raman Spectroscopy

View full text Add to dashboard Cite

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.

show abstract

Influence of water vapour and carbon dioxide on free lime during storage at 80°C, studied by Raman spectroscopy

Cited by 70 publications

References 13 publications

Investigation of the carbonation mechanism of CH and C-S-H in terms of kinetics, microstructure changes and moisture properties

Investigation of the carbonation mechanism of CH and C-S-H in terms of kinetics, microstructure changes and moisture properties

Alkali-activated slag cements produced with a blended sodium carbonate/sodium silicate activator

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

Contact Info

Product

Resources

About