Influence of formulation parameters of cement based materials towards gas production under gamma irradiation

Chartier, D.; Sanchez-Canet, J.; Bessette, Laetitia; Esnouf, S.; Renault, Jean-Philippe

doi:10.1016/j.jnucmat.2018.09.024

Cited by 17 publications

(9 citation statements)

References 16 publications

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“…The latter is expected to be determined mainly by the volume fraction of water in the matrix. This has been reported in recent gamma irradiation studies where the hydrogen yield from structural water in the hydrated phases and pore water was found to be fairly similar to the yield from bulk water [53]. In the present case it is not straight forward to accurately estimate the dose to water within the matrix owing to heterogeneity on the length scale of the alpha particle of hydrated and unhydrated components in the matrix.…”

Section: Figure 23 Sem Images Of Magnox Puo2 Powder Used In This Invesupporting

confidence: 61%

Effects of plutonium dioxide encapsulation on the physico-chemical development of Portland cement blended grouts

Kearney

McLuckie

Webb

et al. 2020

Journal of Nuclear Materials

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Highlights: • PuO2 was encapsulated in BFS / PFA blended cements used for nuclear waste disposal • Cellulose was added to the systems to investigate the effects of organics. • No large scale microstructural defects were observed and good physical contact between the PuO2 and grout was seen. • Changes to the phase assemblage were noted in BFS containing grouts. • Radiolytic gas evolution was consistent with expectations, with increased values observed for samples containing cellulose.

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Section: Figure 23 Sem Images Of Magnox Puo2 Powder Used In This Invesupporting

confidence: 61%

Effects of plutonium dioxide encapsulation on the physico-chemical development of Portland cement blended grouts

Kearney

McLuckie

Webb

et al. 2020

Journal of Nuclear Materials

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“…GHPFRC matrix composite can be used as a bridge connecting board to facilitate the maintenance and repair problem of the expansion joints for corrosive beams, slabs, and rebars of bridges. It can also serve as the airstrips and parking aprons that are repeatedly under static/dynamic load and hot/humid load, as well as shear walls that absorb seismic energy [7][8][9]. With the maturity of production technologies and processes, there is a declining trend in the price of green highperformance fibers.…”

Section: Introductionmentioning

confidence: 99%

Performance Prediction and Mix Ratio Optimization for Multielement Green High-Performance Fiber-Reinforced Cement Matrix Composite

Peng¹

2021

ACSM

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Green high-performance fiber-reinforced cement (GHPFRC) matrix composite is prepared by mixing matrix composites like slurry, mortar, or concrete with reinforcing materials like metal or inorganic nonmetal fiber, synthetic fiber, or natural organic fiber by a certain method. This composite is more energy-efficient, ductile, low-carbon, economic, and environmentally friendly than ordinary concrete. However, the performance of GHPFRC matrix composite has not been fully studied. The existing research only deals with the seismic performance and fire resistance of the material, failing to systematically discuss the optimal mix ratio. To solve the problem, this paper presents an optimization strategy for multielement GHPFRC matrix composite, and carries out multiple tests on its basic mechanical performance, toughness, impact resistance, shrinkage cracking, dry shrinkage performance, and durability. The test data on various indices verify the superior performance of the prepared multielement GHPFRC matrix composite. Further, the optimal mix ratio of the material was determined as: 60% cement, 30% fly ash, and 10% silica ash, with the water-cement ratio of 0.4, water reducer dosage of 1.5%, and quartz sand dosage of 500g.

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“…It appears that (i) cement mainly produces dihydrogen under irradiation by radiolytic decomposition of water present in the pastes (Bibler, 1980;Möckel and Köster, 1982), (ii) the material undergoes textural, mechanical and mineralogical modifications induced by irradiation (Craeye et al, 2015;Soo and Milian, 2001;Vodak et al, 2005). In order to prevent the risk of explosion due to an excessive release of hydrogen in a confined environment, the amount of gas produced by radiolysis within the package must be minimized, which still motivates upstream studies in order to optimize the cement pastes with respect to radiolysis (Chartier et al, 2020;Chartier et al, 2018;Kearney et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

H2 production under gamma irradiation of a calcium aluminate cement: An experimental study on both cement pastes and its stable hydrates

Acher

Noirfontaine²,

Chartier³

et al. 2021

Radiation Physics and Chemistry

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The objective of this paper is to investigate the use of calcium aluminate cements as alternative cements within the context of nuclear waste stabilization by solidification. Using an external 60 Co source, the effect of γ-radiation on H2 gas production of one of the calcium aluminate cement-based materials (cement "Ciment Fondu") and its stable hydrates, was studied. The amount of H2 produced by these cement pastes is found to be much lower (up to five times less) than that of the Portland cement pastes containing the same amount of water, especially in the low range of water to cement ratios (W/C ≤ 0.4) where water is essentially engaged in the hydrates. The H2 production of the two major hydrates of Ciment Fondu, gibbsite AH3 and katoite hydrogarnet C3AH6, is very low compared with that of the main hydrates of other cements (Portland cement, Calcium Sulfo-Aluminate and Magnesium Phosphate cements). The type of water engaged in the hydrates, as hydroxyl groups and/or molecular water, influences significantly the H2 production. Thus, the nature of the hydrate is a key parameter to the aim of optimizing cement matrices with respect to the gas production under irradiation. XRD analysis shows that the crystal structures of gibbsite and katoite are preserved up to very high doses under electron irradiation (3 GGy). This makes calcium aluminate cements (CAC) potential good candidates for nuclear waste conditioning from the point of view of their stability under irradiation.

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Influence of formulation parameters of cement based materials towards gas production under gamma irradiation

Abstract: Présentation des nouveaux intervenants Coordinateur 2 mins Le comité de pilotage accepte les projets de communication du CEA à condition de respecter les volontés de VICAT.

Cited by 17 publications

References 16 publications

Effects of plutonium dioxide encapsulation on the physico-chemical development of Portland cement blended grouts

Effects of plutonium dioxide encapsulation on the physico-chemical development of Portland cement blended grouts

Performance Prediction and Mix Ratio Optimization for Multielement Green High-Performance Fiber-Reinforced Cement Matrix Composite

H2 production under gamma irradiation of a calcium aluminate cement: An experimental study on both cement pastes and its stable hydrates

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