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Autore: Grafiati

Pubblicato: 8 giugno 2024

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1

Liu, Jiang-Feng, Yang Song, Frédéric Skoczylas e Jian Liu. "Gas migration through water-saturated bentonite–sand mixtures, COx argillite, and their interfaces". Canadian Geotechnical Journal 53, n. 1 (gennaio 2016): 60–71. http://dx.doi.org/10.1139/cgj-2014-0412.

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France’s deep-seated nuclear waste repository consists of a natural barrier located at a depth of 500 m in a Callovo-Oxfordian clayey formation. This repository has artificial barriers that include plugs of swelling clay (MX80 bentonite – sand mixtures) for sealing purposes. This paper focuses on the gas migration properties of water-saturated bentonite–sand mixtures and their interfaces with COx argillite. The main contribution of our study is the identification of a preferential gas migration pathway by measuring the downstream gas breakthrough pressures and gas flow rates. The water permeabilities of the bentonite–sand mixtures and their interfaces with COx argillite or COx argillite itself are the same order of magnitude (10−20–10−21 m2). Thus, water tightness can be obtained for these materials when they become completely saturated. The results obtained from the gas breakthrough tests suggest that both the COx argillite and its interface with the bentonite–sand mixture can act as preferential pathways for gas migration. The transport of the gas through the COx argillite or through its interface with the bentonite–sand mixture depends on the initial state of the COx argillite.

2

Cariou, S., Z. Duan, C. Davy, F. Skoczylas e L. Dormieux. "Poromechanics of partially saturated COx argillite". Applied Clay Science 56 (febbraio 2012): 36–47. http://dx.doi.org/10.1016/j.clay.2011.11.021.

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3

Kleib, Joelle, Mouhamadou Amar, Georges Aouad, Xavier Bourbon, Mahfoud Benzerzour e Nor-Edine Abriak. "The Use of Callovo-Oxfordian Argillite as a Raw Material for Portland Cement Clinker Production". Buildings 12, n. 9 (10 settembre 2022): 1421. http://dx.doi.org/10.3390/buildings12091421.

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Excavated soils and rocks are materials obtained in construction works that could represent an ecological issue if a durable and efficient reuse process is not set. The radioactive waste disposal planned by the French National Radioactive Waste Management Agency will generate large quantities of excavated soil (mainly as Callovo-Oxfordian argillite). The re-use of excavated soils is a recent question. There is a lack in the literature concerning the recycling of such materials. Therefore, this paper aims to investigate the possibility of using Callovo-Oxfordian argillite (COx argillite from the French URL) as a raw material for Portland cement clinker production. COx argillite was first characterized by X-ray diffraction (XRD) and X-ray fluorescence (XRF) then a Portland cement clinker was synthesized at laboratory scale. The produced clinker was characterized to verify the chemical and mineralogical composition. After adding gypsum, the reactivity of the resulting cement was assessed by setting time and isothermal calorimetry measurements. The compressive strength was assessed on standard mortar prisms at 1, 14 and 28 days. The results show that a Portland cement clinker containing 64% C3S, 14% C2S, 10% C4AF, 7% C3A and 1% CaO can be produced when 22.24% of raw meal was substituted by the COx argillite. The setting time and isothermal calorimetry results show that the produced cement shows an equivalent reactivity to conventional ordinary Portland cement. The compressive strength at 28 days is 56 MPa, showing that the produced cement can be considered as CEM I 52.5 N Portland cement.

4

Di Donna, Alice, Pascal Charrier, Simon Salager e Pierre Bésuelle. "Self-sealing capacity of argillite samples". E3S Web of Conferences 92 (2019): 03005. http://dx.doi.org/10.1051/e3sconf/20199203005.

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Many countries are currently facing the issue of finding a proper solution to store radioactive wastes coming from nuclear energy production plants. The possibility to store them in underground tunnels is largely considered and investigated. In France, Andra (Agence Nationale pour la gestion des Déchets Radioactifs) selected the Callovo-Oxfordian rock clay (COx) situated in the Meuse/Haute Marne site (France) between 400 and 600 m depth as possible host rock deposit. The excavation of the storage tunnels is expected to create a fractured zone around galleries. However, the factures will be then gradually re-saturated by the underground water coming from the surrounding rock mass and the fractures are expected to self-seal in contact with water, thanks to the swelling potential of COx. The capacity of self-sealing of COx, i.e. closing of fractures after water contact and possibly restoring of hydraulic permeability, is thus of primary interest for the safety of the storage system with respect to water, gas and solutes transport. In the work presented in this paper, the self-sealing behaviour of the COx argillite was investigated through x-ray tomography. The tested samples show significantly different responses depending on the zone where they have been collected on site. The results of mineralogical analyses (x-ray diffraction) are used to understand the observed phenomena.

5

Zhang, Xiang, Hang Yin, Wenjie Yu, Zhen Lei e Juntong Qu. "Numerical Study of Gas Breakthrough in Preferential Rocks for Underground Nuclear Waste Repositories". Minerals 13, n. 3 (11 marzo 2023): 393. http://dx.doi.org/10.3390/min13030393.

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During the long-term storage of radioactive waste, the continuous generation of gas in the disposal area may influence the integrity of host rock. Thus, the investigation of gas migration and breakthrough in low-permeability rock is indispensable for the stability assessment. In this work, the pore space models of four potential host rocks (Boom clay, COx argillite, Opalinus clay, and Beishan granite) were generated via the binarization of the Gaussian random field. This method provides a randomly formed pore network that does rely on an initial definition of pore shape. The constructed models were analyzed and validated by using the mathematical morphology. A numerical calculation scenario of gas breakthrough on the basis of the Young–Laplace equation was proposed and applied. Results show that the gas breakthrough pressures are 2.62–4.11 MPa in Boom clay and 3.72–4.27 MPa in COx argillite. It enhances the idea that the capillary-induced gas breakthrough is possible at pressures lower than the fracture threshold. For Opalinus clay and Beishan granite, no connected pathway exists, and the breakthrough is more likely to occur through pathway dilation or fractures. The presented method has the advantage of experimental reproducibility and brings a new idea for the investigation of fluid migration in low-permeability rocks.

6

Yuan, Haifeng, Franck Agostini, Zhibo Duan, Frédéric Skoczylas e Jean Talandier. "Measurement of Biot's coefficient for COx argillite using gas pressure technique". International Journal of Rock Mechanics and Mining Sciences 92 (febbraio 2017): 72–80. http://dx.doi.org/10.1016/j.ijrmms.2016.12.016.

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7

Duan, Zhibo, Frédéric Skoczylas, Chuanrui Wang e Jean Talandier. "Correction to: Hydric Cycle Impacts on COx Argillite Permeability and Young’s Modulus". Rock Mechanics and Rock Engineering 54, n. 3 (marzo 2021): 1149. http://dx.doi.org/10.1007/s00603-021-02419-w.

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8

Yang, D., S. Chanchole e H. Gharbi. "A specific setup to study hydration and dehydration of COx argillite at applied stresses". Géotechnique Letters 4, n. 2 (29 aprile 2014): 94–97. http://dx.doi.org/10.1680/geolett.14.00017.

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9

Zhang, Xiang, Gilles Duveau e Jean-Baptiste Colliat. "Numerical prediction of gas migration properties in Callovo-Oxfordian (COx) argillite using morpho-mathematical operations". International Journal for Numerical and Analytical Methods in Geomechanics 42, n. 10 (6 aprile 2018): 1125–43. http://dx.doi.org/10.1002/nag.2776.

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10

Gharzouni, A., C. Dupuy, I. Sobrados, E. Joussein, N. Texier-Mandoki, X. Bourbon e S. Rossignol. "The effect of furnace and flash heating on COx argillite for the synthesis of alkali-activated binders". Journal of Cleaner Production 156 (luglio 2017): 670–78. http://dx.doi.org/10.1016/j.jclepro.2017.04.056.

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11

Gilmour, Ernest H., e Edward M. Snyder. "BRYOZOA OF THE MISSION ARGILLITE (PERMIAN), NORTHEASTERN WASHINGTON". Journal of Paleontology 74, n. 4 (luglio 2000): 545–70. http://dx.doi.org/10.1666/0022-3360(2000)074<0545:botmap>2.0.co;2.

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12

Yuan, Haifeng, Franck Agostini, Yan Pei, Mi Zhang, Qingsong Zhang, Frédéric Skoczylas e Jean Talandier. "Experimental investigation on the effects of confining pressure and pore pressure on gas/water transport properties of COx argillite". Applied Clay Science 244 (novembre 2023): 107090. http://dx.doi.org/10.1016/j.clay.2023.107090.

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13

Lassin, Arnault, Nicolas Marty, Benoît Henry, Joachim Trémosa, Hélène Gailhanou, Benoît Madé, Scott Altmann e Eric C. Gaucher. "Equilibrium Partial Pressure of CO2 in the Callovo-Oxfordian Argillite as a Function of Relative Humidity". Procedia Earth and Planetary Science 7 (2013): 459–62. http://dx.doi.org/10.1016/j.proeps.2013.03.083.

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14

Lassin, Arnault, Nicolas C. M. Marty, Hélène Gailhanou, Benoît Henry, Joachim Trémosa, Catherine Lerouge, Benoît Madé, Scott Altmann e Eric C. Gaucher. "Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling". Geochimica et Cosmochimica Acta 186 (agosto 2016): 91–104. http://dx.doi.org/10.1016/j.gca.2016.04.028.

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15

Vasileva, Tanya, e Vasil Petrov. "Reassessment of the resources and hydrochemistry assessment of the Devin hydrothermal mineral deposit, Smolyan region". Review of the Bulgarian Geological Society 84, n. 3 (dicembre 2023): 323–26. http://dx.doi.org/10.52215/rev.bgs.2023.84.3.323.

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Abstract (sommario):

The recent study presents main results of a re-evaluation of the mineral water and geothermal energy of the Devin hydro-mineral deposit, Smolyan region. The deposit occupies an area of about 16 km2, and coincids with the narrow valley of the Devinska River. Hydrochemical methods are applied and chloro-alkaline relations are determined to evaluate the ion exchange and the genesis of the mineral water. The reservoir occurred in a Paleogene tectonic graben filled with breccia-conglomerates, conglomerates, sandstones, and argillites. The mineral water has a composition expressed in equivalent units for cations: Na+ > Mg2+ > Ca2+ > K+, and for anions: (CO3–2+HCO3–) > SO42– > Cl–. The water is of NaHCO3– type, fluorine with a fluoride concentration of 3.7–7.0 mg/L and H2SO3 from 44.62 to 64 mg/L. The TDS content of 247 to 316 mg/l, isothermal to hyperthermal in depth. The regional resources are estimated at 21 l/s and the local resources are estimated at 17.23 l/s. The local geothermal energy of the Devin reservoir reaches 1.212 M J/s.

16

Girard, Jean-Pierre, Christine Fléhoc e Eric Gaucher. "Stable isotope composition of CO2 outgassed from cores of argillites: a simple method to constrain δ18O of porewater and δ13C of dissolved carbon in mudrocks". Applied Geochemistry 20, n. 4 (aprile 2005): 713–25. http://dx.doi.org/10.1016/j.apgeochem.2004.11.005.

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17

Albino, George V. "Sodium metasomatism along the Melones Fault Zone, Sierra Nevada Foothills, California, USA". Mineralogical Magazine 59, n. 396 (settembre 1995): 383–99. http://dx.doi.org/10.1180/minmag.1995.059.396.02.

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AbstractAlbitite, locally aegirine- and riebeckite-bearing, formed as a result of sodium metasomatism of felsic dykes and argillites along the Melones Fault Zone near Jamestown, California. Pyrite, magnetite, hematite and titanite are common in small amounts in altered dykes. The dykes were originally plagioclase-hornblende porphyritic, and had major and trace element abundances typical of calc-alkaline rocks, whereas they now have Na2O contents as high as 11.40%. Associated fracture-filling veins are dominated by albite, but locally include aegirine, analcime, paragonite, calcite and sodic scapolite. Quartz is present in most albitic rocks, but is absent in riebeckite- and aegirine-bearing samples. Albitization predated CO2 metasomatism and formation of sericite-pyrite assemblages that are typical of gold deposits of the Mother Lode Belt.Alkaline fluids responsible for Na-metasomatism had elevated Na+/K+ and Na+/H+ relatively high fO2, and low aH4SiO4. The presence of titanite indicates fluid. The presence of titanite indicates fluid XCO2 was low, in contrast to fluids that formed later carbonate-bearing assemblages. Sodic scapolite suggests that, at least locally, the fluids attained very high salinities.Mass balance calculations indicate that alteration involved addition of large amounts of sodium, and the removal of SiO2 and K2O. Textural preservation, combined with volume factors calculated from specific gravity and whole rock analytical data, indicate that Na-metasomatism was essentially isovolumetric.Sodium-rich zones along the Melones Fault Zone are closely associated with fault-bounded bodies of ultramafic rock, typically altered to talc-carbonate or quartz-magnesite-Cr muscovite assemblages. Carbonatization and talc-forming reactions in the ultramafic rocks may lead to SiO2-undersaturated fluids. Expansion of the muscovite stability field in terms of Na+/K+-Na+/H+, as a result of incorporation of Cr (up to 7.7% Cr2O3) in muscovite, would result in H+- and K+-depletion as the fluid interacts with ultramafic rocks. This could lead to fluids with elevated Na+/K+ and high pH, as documented in this occurrence.

18

Duan, Zhibo, Frédéric Skoczylas, Chuanrui Wang e Jean Talandier. "Hydric Cycle Impacts on COx Argillite Permeability and Young’s Modulus". Rock Mechanics and Rock Engineering, 8 ottobre 2020. http://dx.doi.org/10.1007/s00603-020-02258-1.

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19

Tyri, Danai, Bui Quoc Huy Ly, François Nader, Irini Djeran-Maigre, Jean-Claude Robinet e Jad Zghondi. "Backfill of Radioactive Waste Disposal: Feasibility Study of Argillite/Bentonite (COx/MX80) Pellets". Journal of Nuclear Engineering and Radiation Science 7, n. 4 (22 aprile 2021). http://dx.doi.org/10.1115/1.4050296.

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Abstract A pelletized solution composed of COx argillite and MX80 bentonite is examined as backfill for the deep geological disposal of radioactive waste (Cigéo project). The implementation is studied in terms of installation and hydration conditions as well as their influence on the hydromechanical behavior of the mixture. In the beginning, the optimum grain size distribution (GSD) of pellets assembly is determined to minimize initial voids. A series of discrete element method (DEM) simulations on ternary samples made of spheres is carried out, investigating the optimal conditions in terms of sizes and proportions. Density maximization occurs when the maximum diameter is the dominant size, while minimum and medium diameters are following. As optimum GSD, sizes of 16 mm, 10 mm, and 4 mm in 60%, 10%, and 30% respectively are chosen. The pelletization of the selected sizes is optimized using an adapted tablet machine to carry out the pellet fabrication. A detailed analysis of influential parameters related to the machine accessories and the inserted raw materials is presented. After modifications, quasi-spherical pellets presenting a density of at least 1.95 Mg/m3 are produced. COx/MX80 pellets hydromechanical response is indirectly assessed by studying the swelling potential of COx/MX80 powdered mixtures at equivalent emplaced densities. The influence of density, stress, and MX80 content on swelling is obtained.