Carbonation durability of blended cement pastes used for waste encapsulation

Borges, Paulo Henrique Ribeiro; Milestone, Neil B.; Costa, Juliana Oliveira; Lynsdale, C.J.; Panzera, Túlio Hallak; Christophoro, André L.

doi:10.1617/s11527-011-9788-8

Cited by 17 publications

(5 citation statements)

References 17 publications

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“…As expected, the carbonation rate of the C-S-H paste was higher than that of the C3S paste (2.1 mm/d 0.5 versus 1.1 mm/d 0.5 ). Here, the reduced quantity of calcium in the C-S-H paste may have played a role in increasing the carbonation rate [101][102][103][104][105]. usually observed in carbonated OPC pastes [39,100].…”

Section: Carbonation Rate/gas Diffusionmentioning

confidence: 91%

Carbonation of model cement pastes: The mineralogical origin of microstructural changes and shrinkage

Kangni-Foli

Poyet

Bescop

et al. 2021

Cement and Concrete Research

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This study explored the reactive processes of atmospheric carbonation and the consequences with respect to cementitious materials. Two model pastes were used: hydrated C3S (including C-S-H and portlandite) and a paste prepared by hydrating a blend of C3S and nanosilica (including C-S-H only). The two pastes were carbonated under accelerated conditions in the laboratory. The resulting mineralogical assemblage was examined using X-ray diffraction, thermogravimetric analysis and nuclear magnetic resonance. The microstructural changes were studied by X-ray tomography and porosimetry, and their macroscopic impacts were evaluated through gas diffusion and shrinkage measurements. The use of model pastes allowed for the evaluation of the change in solid volume induced by the carbonation of C-S-H. C-S-H decalcification and subsequent silica chain polymerisation were found responsible for carbonation shrinkage (and potentially cracking). Finally, the results highlight the protective role of portlandite: portlandite helped in limiting C-S-H decalcification and then reducing carbonation shrinkage and cracking.

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Section: Carbonation Rate/gas Diffusionmentioning

confidence: 91%

Carbonation of model cement pastes: The mineralogical origin of microstructural changes and shrinkage

Kangni-Foli

Poyet

Bescop

et al. 2021

Cement and Concrete Research

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“…Glass ingots of 500 g each were distributed for study. 1 Samples used in this study were cut from one of such ingots.…”

Section: Methodsmentioning

confidence: 99%

“…Cement [1][2][3][4], ceramics [5], and glass-ceramic composites [6][7][8][9][10][11][12][13][14] have been proposed as encapsulation materials, as well as glasses of various compositions [5,15]. Glass is promising for its innate ability of the amorphous network to accommodate a wide variety of elements, including the heavy actinides and fission products that result from nuclear energy generation or other processes such as nuclear weapons reclamation and medical treatments.…”

Section: Introductionmentioning

confidence: 99%

In-situ Raman and Brillouin light scattering study of the international simple glass in response to temperature and pressure

Guerette

Huang

2015

Journal of Non-Crystalline Solids

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“…For CEM I, the fact that the optimal RH remained the same for all three temperatures tended to indicate that the temperature-induced modification of the water retention was minor for carbonation but this was not confirmed by the CEM V results that were clearly changed beyond 20°C. Whatever the temperature, the carbonation depth of the composite cement (CEM V/A) paste was greater than that of Portland (CEM I) as we already know [11,[92][93][94][95][96]. Figure 13 compares the carbonation depth values measured using phenolphthalein and XRD.…”

Section: Carbonation Depthmentioning

confidence: 97%