Investigation of the carbonation front shape on cementitious materials: Effects of the chemical kinetics

Thiéry, Mickaël; Villain, Géraldine; Dangla, Patrick; Platret, Gérard

doi:10.1016/j.cemconres.2007.04.002

Cited by 548 publications

(230 citation statements)

References 33 publications

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“…Regarding microstructure aspects, results of the literature suggest that accelerated carbonation at high CO 2 leads to a preferential formation of CC crystals on the surface of CH particles, and thereby inhibits further dissolution of this phase [45]. Note that this feature could also be related to the moisture content of the material since the drier the material is, the more the formation of CC occurs around the surface of CH crystals due to a lack of liquid-water inside the pores to allow aqueous species mobility [46].…”

Section: Pretreatmentmentioning

confidence: 99%

“…Actually, the CO 2 can have reacted at greater depths than the one indicated by the phenolphthalein test, causing a decrease in the pH beyond the carbonation depth determined by spraying phenolphthalein. CC formation beyond the phenolphthalein-pink border has been demonstrated by means of thermoanalytical methods [48,49,6], infrared spectroscopy [50], and gammaray attenuation [51,52,46]. In addition, the drawback of the phenolphthalein test can be related to the formation of calcite surrounding portlandite crystals, and limiting thus their accessibility and their capacity in buffering the pore solution.…”

Section: Phenolphtalein Spray Testmentioning

confidence: 99%

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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

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751

285

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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.

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Section: Pretreatmentmentioning

confidence: 99%

Section: Phenolphtalein Spray Testmentioning

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

Self Cite

751

285

View full text Add to dashboard Cite

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“…Furthermore, their effects can change with time. In addition, some investigations (Thiery et al, 2007;Montes-Hernandez et al, 2009) suggested a simple reaction mechanism for CO 2 sequestration by steelmaking slag in two successive steps: first, the irreversible hydration of calcium oxide or lime as shown in Eq. (15) Not only Ca(OH) 2 but also other hydrate compounds can react with CO 2 .…”

Section: Process Chemistrymentioning

confidence: 99%

“…(15) Not only Ca(OH) 2 but also other hydrate compounds can react with CO 2 . For instance, the calcium-silicatehydrates (C-S-H) can react with CO 2 , and produce CaCO 3 and a silica gel (Thiery et al, 2007;Tsuyoshi et al, 2010). Uibu et al (2011) found that Ca 2 SiO 4 and Ca 3 Mg(SiO 4 ) 2 were the main CO 2 binding components in electric arc furnace (EAF) slag according to quantitative XRD analysis, and the main product was calcite.…”

Section: Process Chemistrymentioning

confidence: 99%

CO2 Capture by Accelerated Carbonation of Alkaline Wastes: A Review on Its Principles and Applications

Pan

Chang

Chiang

2012

Aerosol Air Qual. Res.

358

193

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CO 2 capture, utilization, and storage (CCUS) is a promising technology wherein CO 2 is captured and stored in solid form for further utilization instead of being released into the atmosphere in high concentrations. Under this framework, a new process called accelerated carbonation has been widely researched and developed. In this process, alkaline materials are reacted with high-purity CO 2 in the presence of moisture to accelerate the reaction to a timescale of a few minutes or hours. The feedstock for accelerated carbonation includes natural silicate-minerals (e.g., wollastonite, serpentine, and olivine) and industrial residues (e.g., steelmaking slag, municipal solid waste incinerator (MSWI) ash, and air pollution control (APC) residues). This research article focuses on carbonation technologies that use industrial alkaline wastes, such as steelmaking slags and metalworking wastewater. The carbonation of alkaline solid waste has been shown to be an effective way to capture CO 2 and to eliminate the contents of Ca(OH) 2 in solid residues, thus improving the durability of concrete blended with the carbonated residues. However, the operating conditions must be further studied for both the economic viability of the technology and the optimal conditions for CO 2 reaction.

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“…At the modeling level, we are influenced by the asymptotic investigation of Ca(OH) 2 leaching in concrete done by Mainguy in his PhD thesis [16] and then applied in [17] by Mainguy and Coussy to the same problem. Similar ideas as in [16] were employed in the context of carbonation by Thiéry et al in [30][31][32]. At the technical level, our approach is different (the working tool is the technique of matched asymptotics; see [1,26], e.g., for details).…”

Section: Introductionmentioning

confidence: 99%

On the interplay between fast reaction and slow diffusion in the concrete carbonation process: a matched-asymptotics approach

Muntean

2008

Meccanica

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A matched-asymptotics approach is proposed to show the occurrence of two distinct characteristic length scales in the carbonation process. The separation of these scales arises due to the strong competition between reaction and diffusion effects. We show that for sufficiently large times τ the width of the carbonated region is proportional to √ τ , while the width of the reaction front is proportional to τ p−1 2(p+1) for carbonation-reaction rates with a power law structurewhere k > 0 and p, q > 1 and identify the proportionality coefficient asymptotically. We emphasize the occurrence of a water barrier in the reaction zone which may hinder the penetration of CO 2 by locally filling with water air parts of the pores. This non-linear effect may be one of the causes why a purely linear extrapolation of accelerated carbonation test results to natural carbonation settings is (even theoretically) not reasonable. Finally, we compare our asymptotic penetration law against measured penetration depths from Bune (Zum Karbonatisierungsbedingten Verlust der Dauerhaftigkeit von Außenbauteilen aus Stahlbeton, 1994 We offer an alternative to the (asymptotic) √ τ expression of the carbonation-front position obtained in Papadakis et al. (AIChE J. 35:1639(AIChE J. 35: , 1989).

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Investigation of the carbonation front shape on cementitious materials: Effects of the chemical kinetics

Cited by 548 publications

References 33 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

CO2 Capture by Accelerated Carbonation of Alkaline Wastes: A Review on Its Principles and Applications

On the interplay between fast reaction and slow diffusion in the concrete carbonation process: a matched-asymptotics approach

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