Corrosion of alkali–borosilicate waste glass K-26 in non-saturated conditions

Ojovan, Michael I.; Hand, Russell J.; Ojovan, N. V.; Lee, William

doi:10.1016/j.jnucmat.2004.10.095

Cited by 55 publications

(54 citation statements)

References 41 publications

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“…Borosilicate glasses are of growing interest, especially for nuclear waste encapsulation [5,6], but they are already familiar both within and without laboratories, as pyrex is an optimized borosilicate glass, selected in 1915 from thousands of compositions for its optimized ability to sustain mechanical shock [7]. The ability to resist thermal shock depends on thermal expansivity, and because of thermal fluctuations during quenching there is a good correlation between the two abilities to resist shock [8].…”

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confidence: 99%

Structure and function of window glass and Pyrex

Phillips

Kerner

2008

The Journal of Chemical Physics

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Window glass is a ternary mixture, while pyrex (after window glass, the most common form of commercial glass) is a quaternary. Building on our previous success in deriving the composition of window glass (sodium calcium silicate) without adjustable parameters, and borrowing from known reconstructed crystalline surfaces, we model pyrex as silica clusters with a specific ternary interface. Our global model explains the thermal expansivity contours of ternary sodium borosilicates, and it is consistent with the optimized resistance of pyrex to mechanical and thermal shocks.It suggests new directions for studying the nanoscopic structure of these remarkable materials.In principle the structure of glasses is an exponentially complex combinatorial problem.In the early days of glass science it was customary to dismiss this problem by saying that network glasses, for example, form "continuous random networks", or that metallic glasses could be modeled by "random" packing of hard spheres. Modern glass theory goes far beyond these early models, but there are still many approaches to understanding glass structure and properties. One approach, that has the advantage of being close to commercial practice, is variational (standard for mathematical studies of non-polynomial complete (complex) problems) and focuses attention on optimizing structural properties as a function of composition. Here we adopt this approach to study pyrex (next to

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confidence: 99%

Structure and function of window glass and Pyrex

Phillips

Kerner

2008

The Journal of Chemical Physics

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“…Leaching mechanism can be classified into two general categories: 1) initial wash off and 2) diffusion control. On the basis of parameters A 1 and leaching coefficient D e [8], in different cement matrix formulations, we have noticed that leaching rate of Cs 137 > Co 60 which is matched with other studies [1][2][3][4]. We have also observed that Cs 137 and Co 60 cumulative amount of leached, f, decreased in order f (C-II) > f (C-IV) > f (C-I) > f (C-III).…”

Section: Resultsmentioning

confidence: 99%

“…Second partial in equation (5), represent the leach coefficient of transport mechanism, D e (cm 2 /d) [8][9][10][11].…”

Section: Radionuclide Migration Through Porous Materials and Modellinmentioning

confidence: 99%

Mathematical Modelling of Immobilization of Radionuclides 137Cs and 60Co in Concrete Matrix

Plećaš¹,

Dimović²

2009

TOWMJ

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Transport phenomena involved in the leaching of a radioactive material from a cement composite matrix are investigated using an empirical method employing a polynomial equation. To assess the safety for disposal of radioactive waste-cement composition, the leaching of 137 Cs and 60 Co, from a waste composite into a surrounding fluid has been studied. Leaching tests were carried out in accordance with a method recommended by IAEA. Determination of retardation factors, K F and coefficients of distribution, k d , using a simplified mathematical model for analyzing the migration of radionuclides, has been developed. Transport phenomena involved in the leaching of a radioactive material from a cement composite matrix are investigated using an empirical method employing a polynomial equation. In our experiment we have analyzed mechanism of 137 Cs and 60 Co leaching values during a period of 60 days. Results presented in this paper are examples of values obtained in a 25 year mortar and concrete testing project, which will influence the design of the engineered trenches system for a future central Serbian radioactive waste storage centre.

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“…[61] Equations [11] and [14] reveal that ion exchange occurs preferentially in acidic and neutral solutions but diminishes quickly with the increase of pH, whereas hydrolysis occurs preferentially in basic solutions but diminishes quickly with the decrease of pH. It is normally considered that for pH < 9 to 10, ion exchange dominates glass corrosion, whereas hydrolysis reactions are significant when the pH exceeds 9.…”

Section: ½10mentioning

confidence: 99%

“…This occurs because the activation energy for hydrolysis E a is significantly higher than the activation energies of diffusive processes E dA . It has been shown that the diffusion-controlled ion exchange stage is dominant up to a time, s(T), given by [58,61] …”

Section: ½10mentioning

confidence: 99%

Glassy Wasteforms for Nuclear Waste Immobilization

Ojovan

Lee

2010

Metall Mater Trans A

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253

124

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Glassy wasteforms currently being used for high-level radioactive waste (HLW) as well as for low-and intermediate-level radioactive waste (LILW) immobilization are discussed and their most important parameters are examined, along with a brief description of waste vitrification technology currently used worldwide. Recent developments in advanced nuclear wasteforms are described such as polyphase glass composite materials (GCMs) with higher versatility and waste loading. Aqueous performance of glassy materials is analyzed with a detailed analysis of the role of ion exchange and hydrolysis, and performance of irradiated glasses.

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Corrosion of alkali–borosilicate waste glass K-26 in non-saturated conditions

Cited by 55 publications

References 41 publications

Structure and function of window glass and Pyrex

Structure and function of window glass and Pyrex

Mathematical Modelling of Immobilization of Radionuclides 137Cs and 60Co in Concrete Matrix

Glassy Wasteforms for Nuclear Waste Immobilization

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