Measurement methods of carbonation profiles in concrete: Thermogravimetry, chemical analysis and gammadensimetry

Villain, Géraldine; Thiéry, Mickaël; Platret, Gérard

doi:10.1016/j.cemconres.2007.04.015

Cited by 486 publications

(200 citation statements)

References 16 publications

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“…Only small differences can be observed in regard to the total combined water, in particular, due to the water contained in carbonates (Table 1, T3). According to Villain et al [52], calcium carbonate CaCO 3 ensuing form the degradation of the CSH gel gives place to vaterite and/or aragonite whose dissociation takes place between 650°C and 800°C and CaCO 3 calcite ensuing from portlandite Ca(OH) 2 carbonation dissociated between 850°C and 1000°C according to Figures 1(a)-1(c). For 28 days, the water loss combined with portlandite indicates that about 24% of total loss is due to the portlandite, with the portlandite content for samples obtained by both mixing methods being about 14 wt.%.…”

Section: Resultsmentioning

confidence: 96%

“…Due to the possible portlandite carbonation, it is necessary to adjust the portlandite quantity and include it in the temperature range where the carbonate loss takes place (515°C-1100°C). Villain et al [52] indicated that the calcium carbonate (CaCO 3 ) ensuing of the CSH carbonation dissociates in a lower temperature range than the CaCO 3 ensuing of the portlandite carbonation allowing it to di erentiate both carbonations thermally. e authors consider that the water contained in the carbonates is 40 wt.% of the total weight loss in this temperature range.…”

Section: Resultsmentioning

confidence: 99%

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Viability Study of a Safe Method for Health to Prepare Cement Pastes with Simultaneous Nanometric Functional Additions

Rubia

Lucas-Gil

Reyes

et al. 2018

Advances in Materials Science and Engineering

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e use of a mixing method based on a novel dry dispersion procedure that enables a proper mixing of simultaneous nanometric functional additions while avoiding the health risks derived from the exposure to nanoparticles is reported and compared with a common manual mixing in this work. Such a dry dispersion method allows a greater workability by avoiding problems associated with the dispersion of the particles. e two mixing methods have been used to prepare Portland cement CEM I 52.5R pastes with additions of nano-ZnO with bactericide properties and micro-or nanopozzolanic SiO 2 . e hydration process performed by both mixing methods is compared in order to determine the efficiency of using the method. e hydration analysis of these cement pastes is carried out at different ages (from one to twenty-eight days) by means of differential thermal analysis and thermogravimetry (DTA-TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) analyses. Regardless of composition, all the mixtures of cement pastes obtained by the novel dispersion method showed a higher retardation of cement hydration at intermediate ages which did not occur at higher ages. In agreement with the resulting hydration behaviour, the use of this new dispersion method makes it possible to prepare homogeneous cement pastes with simultaneous functional nanoparticles which are physically supported on the larger particles of cement, avoiding exposure to the nanoparticles and therefore minimizing health risks. Manual mixing of cement-based materials with simultaneous nanometric functional nanoparticles on a large scale would make it difficult to obtain a homogenous material together with the health risks derived from the handling of nanoparticles.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Viability Study of a Safe Method for Health to Prepare Cement Pastes with Simultaneous Nanometric Functional Additions

Rubia

Lucas-Gil

Reyes

et al. 2018

Advances in Materials Science and Engineering

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“…This was operated at a flow rate of 50 ml-air/min and the temperature was increased from 50 o C to 800 o C at a rate of 10 o C/min. Weights of relevant hydrated and carbonated phases were calculated by measuring weight changes between intervals in TGA curves that were indicated by the peaks in differential scanning calorimetry (DSC) curves (Villain et al, 2007). SPC/CFA showed the greatest strength among the sealants exposed to scCO 2 , measuring 37.6 MPa on the 14 th day, which was two times greater than that of PC at 18.5…”

Section: Methodsologymentioning

confidence: 99%

Strength Development and Carbonation Characteristics of Slag Cement/Class C Fly Ash blended CO₂Injection Well Sealant

Kim¹,

Hwang²,

Hwang³

2016

Journal of Soil and Groundwater Environment

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CO 2 injection well sealant is vulnerable to supercritical CO 2 (scCO 2 ) exposure. To develop an alternative to the conventional sealant system (class G cement/class F fly ash), the performance of slag cement (SPC) systems containing class F fly ash (FFA) or class C fly ash (CFA) was evaluated and compared with the conventional sealant under scCO 2 conditions. All sealant systems showed an immediate increase in compressive strength upon scCO 2 exposure and, at 37.6 MPa, SPC/CFA showed the highest compressive strength after 14 days, which was much higher than the 29.8 MPa of the conventional sealant system. Substantial decreases in porosity were observed in all sealant systems, which were partly responsible for the increase in strength. Carbonation reactions led to pH decreases in the tested sealants from 12.5 to 10~11.6. In particular, the greatest decrease in pH in slag cement/class C fly ash probably supported relatively sustainable alkali activation reactions and the integrity of cement hydrates in this system. XRD revealed the presence of CaCO 3 and a decrease in the content of cement hydrates in the tested sealants upon scCO 2 exposure. TGA demonstrated a greater increase of CaCO 3 and calcium-silicate-hydrate phases in SPC/CFA than in the conventional sealant upon scCO 2 exposure.

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“…The mass loss associated with the presence of calcium carbonate polymorphs appears at 500-800°C 26 . The differential thermogram profile of the irradiated sample did not show any significant differences in this region compared with the heated and control specimens.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Gamma irradiation resistance of an early age slag-blended cement matrix for nuclear waste encapsulation

et al. 2015

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Irradiation is one of the characteristic conditions that nuclear wasteforms must withstand to assure integrity during their service life. This study investigates gamma irradiation resistance of an early age slag cement-based grout, which is of interest for the nuclear industry as it is internationally used for encapsulation of low and intermediate level radioactive wastes. The slag cement-based grout withstands a gamma irradiation dose of 4.77 MGy over 256 hours without reduction in its compressive strength; however, some cracking of irradiated samples was identified. The high strength retention is associated with the fact that the main hydration product forming in this binder, a calcium aluminum silicate hydrate (C-A-S-H) type gel, remains unmodified upon irradiation. Comparison with a heat-treated sample was carried out to identify potential effects of the temperature rise during irradiation exposure. The results suggested that formation of cracks is a combined effect of radiolysis and heating upon irradiation exposure.

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Measurement methods of carbonation profiles in concrete: Thermogravimetry, chemical analysis and gammadensimetry

Cited by 486 publications

References 16 publications

Viability Study of a Safe Method for Health to Prepare Cement Pastes with Simultaneous Nanometric Functional Additions

Viability Study of a Safe Method for Health to Prepare Cement Pastes with Simultaneous Nanometric Functional Additions

Strength Development and Carbonation Characteristics of Slag Cement/Class C Fly Ash blended CO₂Injection Well Sealant

Gamma irradiation resistance of an early age slag-blended cement matrix for nuclear waste encapsulation

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Measurement methods of carbonation profiles in concrete: Thermogravimetry, chemical analysis and gammadensimetry

Cited by 486 publications

References 16 publications

Viability Study of a Safe Method for Health to Prepare Cement Pastes with Simultaneous Nanometric Functional Additions

Viability Study of a Safe Method for Health to Prepare Cement Pastes with Simultaneous Nanometric Functional Additions

Strength Development and Carbonation Characteristics of Slag Cement/Class C Fly Ash blended CO2Injection Well Sealant

Gamma irradiation resistance of an early age slag-blended cement matrix for nuclear waste encapsulation

Contact Info

Product

Resources

About

Strength Development and Carbonation Characteristics of Slag Cement/Class C Fly Ash blended CO₂Injection Well Sealant