Characterization of CaCO<sub>3</sub> hydrates by micro‐Raman spectroscopy

Tlili, Mohamed; Amor, Mohamed Ben; Gabrielli, C.; Joiret, S.; Maurin, G.; Rousseau, Philippe

doi:10.1002/jrs.806

Cited by 196 publications

(188 citation statements)

References 26 publications

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“…Table 1 (C-O function group, Out-plan bending in calcite) for CaCO3 in calcite form. This is also consistent with research by Tlili et al [27] and Wu et al [28] on FT-IR spectra for CaCO3. Figure 4.…”

Section: Characteristics Of the Metal Carbonate: Ft-ir Analysissupporting

confidence: 93%

CO2 Fixation by Membrane Separated NaCl Electrolysis

et al. 2015

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Atmospheric concentrations of carbon dioxide (CO2), a major cause of global warming, have been rising due to industrial development. Carbon capture and storage (CCS), which is regarded as the most effective way to reduce such atmospheric CO2 concentrations, has several environmental and technical disadvantages. Carbon capture and utilization (CCU), which has been introduced to cover such disadvantages, makes it possible to capture CO2, recycling byproducts as resources. However, CCU also requires large amounts of energy in order to induce reactions. Among existing CCU technologies, the process for converting CO2 into CaCO3 requires high temperature and high pressure as reaction conditions. This study proposes a method to fixate CaCO3 stably by using relatively less energy than existing methods. After forming NaOH absorbent solution through electrolysis of NaCl in seawater, CaCO3 was precipitated at room temperature and pressure. Following the experiment, the resulting product CaCO3 was analyzed with Fourier transform infrared spectroscopy (FT-IR); field emission scanning electron microscopy (FE-SEM) image and X-ray diffraction (XRD) patterns were also analyzed. The results showed that the CaCO3 crystal product was high-purity calcite. The study shows a successful method for fixating CO2 by reducing carbon dioxide released into the atmosphere while forming high-purity CaCO3. OPEN ACCESSEnergies 2015, 8 8705

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Section: Characteristics Of the Metal Carbonate: Ft-ir Analysissupporting

confidence: 93%

CO2 Fixation by Membrane Separated NaCl Electrolysis

et al. 2015

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“…The Raman bands associated with CaCO3 are not abundant and therefore their presence in the average Raman spectrum is low when compared with the main Raman bands. The presence of this type of carbonate is much more abundant in the three weathered cements than in cement A, especially in cement D. These carbonates correspond to the first stage of the CaCO3 precipitation process from saturated solutions and carbonation of wet slurries as a well-described side effect when hydrating cementitious materials [10][11][12]. The different weathered cements (cement B, C and D) were also analyzed by CRM (Fig.…”

Section:  Confocal Raman Microscopy Resultsmentioning

confidence: 99%

Confocal Raman Microscopy: new perspective on the weathering of anhydrous cement

Torres-Carrasco

Campo

Rubia

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Raman spectroscopy when is combined with Confocal microscopy is a nondestructive technique that allow us to obtain information in cementitious materials. In this study, we present non-destructive image and structural analysis of anhydrous cement with carbonation evidences by Confocal Raman Microscopy (CRM). The results obtained by CRM show a direct relationship between the presence of the weathering processes of an anhydrous cement with the presence of sulphates and surprisingly, with the existence of amorphous carbon in the medium. IntroductionRaman spectroscopy is a vibrational spectroscopic technique complementary to the more widely used infrared spectroscopy. The use of Raman spectroscopy in the characterization of the various cements and supplementary cementitious materials (SCMs) has been investigated over the last four decades [1][2][3][4]. However, in 2013, Schmid et al. [5] published the first successful and to date only Raman imaging study on cementitious materials. In this study was possible to reveal the chemical heterogeneity of distinct clinker phases with different crystal orientations. Recent studies have evaluated the use of Confocal Raman Microscopy (CRM) as a non-destructive technique in the determination of the hydration process of the C3S phase present in the clinker [6].Raman spectroscopy when is combined with Confocal microscopy is a non-destructive technique that allows identifying the phase composition in inorganic [7] and carbon based materials [8] with high spatial resolution. Supporting us in Raman investigations of anhydrous and hydrated cementitious pastes, the use of CRM can give us excellent information about the properties of this material.The aim of the present work is to study cement weathering features by CRM. Conventional techniques, such as FTIR and DTA/TG, are also applied on different cement samples in order to determine the degree of weathering. In addition of the good agreement between conventional techniques and CRM, a correlation between presences of amorphous carbon species is established with the extent of cement weathering. The present findings confirm CRM as a fast and reliable technique for the determination of weathering in cement and a key tool to understand the weathering mechanism.

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“…Among the various components of natural water, some are likely to react with each other in a system known as the calco-carbonic system "CO 2 -H 2 O-CaCO 3 " [8]. This three-phase system consists of a gas phase (CO 2 ), a liquid phase and a solid phase (CaCO 3 ).…”

Section: Description Of Calco-carbonic Systemmentioning

confidence: 99%