Selection of a mineral binder with potentialities for the stabilization/solidification of aluminum metal

Coumes, C. Cau Dit; Lambertin, David; Lahalle, Hugo; Antonucci, Pascal; Cannes, Céline; Delpech, Sylvie

doi:10.1016/j.jnucmat.2014.06.032

Cited by 50 publications

(26 citation statements)

References 33 publications

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“…Scanning electron microscope observation of a cross-section after resaturation in solution S1a of an aluminum coupon embedded in cement CEM I T A B L E 4 Molar volume of some possible corrosion products of aluminum [14] Name Formula Molar volume (cm 3 Figure 19. At the beginning of the resaturation process after cure and drying (time t = 0), the weight of the dried mortar samples was close to 2,000 g. When immersed in solution S1a, the weight of the blocks increased up to 2,200-2,250 g after only 5 days and remained constant for longer exposures, demonstrating that the mortar was completely saturated with water in a couple of days when immersed in solution S1a.…”

Section: Corrosion Rate Measurements During Resaturation Under Contmentioning

confidence: 99%

“…However, several authors have presented results highlighting high corrosion rates of aluminum when encapsulated in cement [ 3–6 ] ; some recent research has however underlined that the corrosion rate of aluminum in cement matrix is not constant with time. The corrosion rate is high at very early times (casting and curing time), and then, the rate significantly slows down with time.…”

Section: Introductionmentioning

confidence: 99%

“…This assessment underlines the possible applicability of the concept which is also confirmed by experience from the building industry demonstrating that aluminum can be suitable in alkaline environments such as cements and concretes. [2] However, several authors have presented results highlighting high corrosion rates of aluminum when encapsulated in cement [3][4][5][6] ; some recent research has however underlined that the corrosion rate of aluminum in cement matrix is not constant with time. The corrosion rate is high at very early times (casting and curing time), and then, the rate significantly slows down with time.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion behavior of aluminum alloy 5754 in cement‐based matrix‐simulating nuclear waste disposal conditions

Mendibide

Dusquesnes

Deydier

et al. 2020

Materials & Corrosion

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Depending on the lifetime and level of radioactivity of radioactive wastes, different disposal facilities are considered. Though low‐ and intermediate‐level short‐lived waste can be disposed in surface disposal facilities, deep geological disposal is considered for high‐ and intermediate‐level long‐lived waste. In France and Belgium, long‐term disposal is studied in clay host rock media. For aluminum, the disposal concept is based on encapsulation of the waste in a cement‐based matrix. It is also well‐known that aluminum is prone to severe corrosion in sufficiently alkaline environments leading to possible hydrogen production. To ensure the safety of the disposal facilities and the integrity of the cement capsules, the amount of aluminum that is disposed in each waste package must be specified and is limited to mitigate the level of hydrogen production by aluminum corrosion. In the present study, the corrosion resistance of an aluminum alloy (grade EN‐AW‐5754/H111) in two different cement matrices was studied in different configurations at room temperature. In each case, the evolution of hydrogen production was monitored to address the corrosion rate variation versus time.

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Section: Corrosion Rate Measurements During Resaturation Under Contmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Corrosion behavior of aluminum alloy 5754 in cement‐based matrix‐simulating nuclear waste disposal conditions

Mendibide

Dusquesnes

Deydier

et al. 2020

Materials & Corrosion

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show abstract

“…wet granular ion-exchangers, slurries, etc.). There are numerous different cement systems that have been implemented or proposed to be used as waste forms, including Portland cement and its blends, 11 calcium aluminate cement and its modifications with sulfate or phosphate, 12,13 magnesium silicate or phosphate cement, 14,15 as well as various types of alkali-activated cements. [16][17][18] In choosing a suitable cement system for encapsulation of spent ion-exchangers, there are two important aspects to consider: firstly, the interactions between the ion-exchangers and the cement binder (chemical and dimensional stability); secondly, the partition (or redistribution) of radioelements between the spent ion-exchangers and the cement binder itself.…”

Section: Introductionmentioning

confidence: 99%

Alkali aluminosilicate geopolymers as binders to encapsulate strontium-selective titanate ion-exchangers

Bernal

Satō

et al. 2019

Dalton Trans.

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“…For that purpose, we have selected from our previous work the worst and the best matrices, respectively based on Ordinary Portland Cement and magnesium phosphate cement with addition of lithium nitrate. 14 The electrochemical analysis consists in open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) measurements at OCP. At Al electrode, because a corrosion reaction occurs, OCP corresponds to the corrosion potential.…”

mentioning

confidence: 99%

Kinetic Model of Aluminum Behavior in Cement-Based Matrices Analyzed by Impedance Spectroscopy

Delpech¹,

Cannes²,

Barré³

et al. 2017

J. Electrochem. Soc.

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Aluminum reactivity in cement-based matrices, generally used for conditioning low-and intermediate-level radioactive wastes, is a problem due to dihydrogen produced by the corrosion reaction which depends on the pH of the pore solution. Electrochemical impedance spectroscopy has been used to propose a mechanism for aluminum corrosion in cementitious matrices based on ordinary Portland cement (OPC, pH ≈ 13) or magnesium phosphate cement (MKP, pH ranging between 4 and 9) containing or not LiNO 3 as a corrosion inhibitor. The fit of impedance diagrams recorded on aluminum electrode as a function of time has been realized using electrical parameters to model the cement and kinetic constants for the faradaic impedance. The so determined kinetic constants are used to calculate the corrosion current and the dihydrogen production as a function of time. Comparison of these results with experimental measurements of dihydrogen release obtained by gas chromatography shows a very good agreement except in the MKP matrix containing LiNO 3 . In the OPC matrix, dihydrogen production is between 500 and 1000 times higher than in the MKP matrix, which put in evidence the significant benefit in using MKP cements for aluminum encapsulation. It has long been common practice to stabilize and solidify lowand intermediate-level radioactive wastes using cement before sending them to disposal.1-3 The wastes are confined with a cement or a mortar in a steel container which is closed. Ordinary Portland Cement (OPC) is one of the most widely used materials for conditioning radioactive wastes. Indeed, it is inexpensive, it can be easily supplied and, after hydration, it can exhibit high stability over time. 4 However, wastes produced by nuclear activities are very diverse and, under certain circumstances, can chemically react with cementbased phases or aqueous interstitial solution, thus reducing the quality of the conditioning material. For instance, the dismantling of old nuclear reactors generates a large volume of low and intermediate-level wastes, some of them containing metallic aluminum. Aluminum is a reactive amphoteric metal, forming a protective oxide layer on contact with air or water. This layer is generally stable in the pH range 4-9. [5][6][7] However, in a strongly alkaline medium, such as that encountered in conventional cementitious materials based on OPC, this layer is soluble, resulting in continued corrosion with associated liberation of dihydrogen. Then, the use of Portland cement to encapsulate large amounts of aluminum is prohibited. The formation of dihydrogen contributes to increase the pressure in the container which is able to crack. It is the reason why the main criterion for metallic waste management is based on the volume of dihydrogen production.In this context, our work concerns the aluminum reactivity in cement-based matrices for conditioning radioactive wastes. To overcome the Al corrosion, the strategy proposed consists in (i) replacing OPC by an alternative mortar leading to a pore solution with an appropria...

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Selection of a mineral binder with potentialities for the stabilization/solidification of aluminum metal

Cited by 50 publications

References 33 publications

Corrosion behavior of aluminum alloy 5754 in cement‐based matrix‐simulating nuclear waste disposal conditions

Corrosion behavior of aluminum alloy 5754 in cement‐based matrix‐simulating nuclear waste disposal conditions

Alkali aluminosilicate geopolymers as binders to encapsulate strontium-selective titanate ion-exchangers

Kinetic Model of Aluminum Behavior in Cement-Based Matrices Analyzed by Impedance Spectroscopy

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