Characterization of Cement Microstructure for the Immobilization of Nuclear Waste Using Advanced Imaging Methods

2012 ◽  
Vol 1475 ◽  
Author(s):  
D.L. Engelberg ◽  
J.A. Duff ◽  
L. Murray ◽  
L. Dodds ◽  
N. Mobasher ◽  
...  
Keyword(s):  
Nuclear Waste ◽  
Pore Space ◽  
Imaging Techniques ◽  
Image Correlation ◽  
Advanced Imaging ◽  
Comprehensive Picture ◽  
X Ray Computed ◽  
Matrix Fraction ◽  
Nuclear Waste Immobilization

ABSTRACTA range of advanced imaging techniques have been brought together to provide a comprehensive picture of cement microstructure for nuclear waste immobilization. Image analysis of Nirex Reference Vault Backfill (NRVB) has been used to characterize the Calcium-Silicate-Hydrate (C-S-H) matrix fraction. Through weight loss measurements and digital image correlation of OPC-based cement blends we have quantified the development of microstructure surface strains during the initial 48 hrs hardening period. The build-up of displacements on the microstructure scale indicated grain-like compressive areas, surrounded by a network of tensile regions. Serial sectioning of NRVB using ultra-microtome cutting has been explored for advanced high-resolution 3D microstructure characterization, while X-ray Computed Tomography (XCT) has been used to obtain information of the 3-D pore space and size distribution of air pores in NRVB non-destructively.

scholarly journals Petrophysical characterization of coquinas from Morro do Chaves Formation (Sergipe-Alagoas Basin) by x-ray computed tomography

2018 ◽  
Vol 18 (3) ◽  
pp. 3-13
Author(s):  
Aline Maria Poças Belila ◽  
Michelle Chaves Kuroda ◽  
João Paulo Da Ponte Souza ◽  
Alexandre Campane Vidal ◽  
Osvair Vidal Trevisan
Keyword(s):  
Computed Tomography ◽  
Pore Space ◽  
Three Dimensional ◽  
Petroleum Reservoirs ◽  
Self Organizing Maps ◽  
X Ray ◽  
The Neural Network ◽  
Rock Structure ◽  
X Ray Computed

Carbonate rocks constitute a large number of petroleum reservoirs worldwide. Notwithstanding, the characterization of these rocks is still a challenge due to their high complexity and pore space variability, indicating the importance of further studies to reduce uncertainty in reservoir interpretation and characterization. This work was performed for coquina samples from Morro do Chaves Formation (Sergipe-Alagoas Basin), analogous to important Brazilian reservoirs. Computed tomography (CT) was used for three-dimensional characterization of rock structure. The neural network named Self-Organizing Maps (SOM) was used for CT images segmentation. According to our tests, CT demonstrated to be a consistent tool for quantitative and qualitative analysis of heterogeneous pore space, by the evaluation of porosity, connectivity and the representative elementary volume.

scholarly journals An Interdisciplinary View of Interfaces: Perspectives Regarding Emergent Phase Formation

2017 ◽  
Vol 15 (1) ◽  
Author(s):  
Kyle S. Brinkman
Keyword(s):  
Phase Formation ◽  
Imaging Techniques ◽  
Three Dimensional ◽  
Interdisciplinary Approach ◽  
Solution Calorimetry ◽  
Waste Immobilization ◽  
Multiphase Systems ◽  
Diverse Application ◽  
Nuclear Waste Immobilization

A perspective on emergent phase formation is presented using an interdisciplinary approach gained by working at the “interface” between diverse application areas, including solid oxide fuel cells (SOFCs) and ionic membrane systems, solid state lithium batteries, and ceramics for nuclear waste immobilization. The grain boundary interfacial characteristics of model single-phase materials in these application areas, including (i) CeO2, (ii) Li7La3Zr2O12 (LLZO), and (iii) hollandite of the form BaxCsyGa2x+yTi8-2x-yO16, as well as the potential for emergent phase formation in composite systems, are discussed. The potential physical properties resulting from emergent phase structure and distribution are discussed, including an overview of existing three-dimensional (3D) imaging techniques recently used for characterization. Finally, an approach for thermodynamic characterization of emergent phases based on melt solution calorimetry is outlined, which may be used to predict the energy landscape including phase formation and stability of complex multiphase systems.

Mineralogical aspects of cement in radioactive waste disposal

2001 ◽  
Vol 65 (5) ◽  
pp. 621-633 ◽  
Author(s):  
F. P. Glasser
Keyword(s):  
Radioactive Waste ◽  
Nuclear Waste ◽  
Radioactive Waste Disposal ◽  
Geological Time ◽  
Hydrous Oxides ◽  
Physical Chemical ◽  
Mineralogical Characteristics ◽  
Waste Immobilization ◽  
Nuclear Waste Immobilization

AbstractSome of the physical, chemical and mineralogical characteristics of Portland cement and related materials relevant to nuclear waste immobilization are defined. The ability to condition and maintain a high aqueous pH is undoubtedly the most important factor: it precipitates many species as hydrous oxides or hydroxides. However, in the longer term, many species – cationic as well as anionic – react with one or more cement components forming solubility-limiting phases. Progress on characterization of these phases is outlined. Many of the host phases have natural equivalents and this gives comfort in respect of their likely persistence over geological time. The emerging picture of immobilization in cement suggests that cement compositions can be tailored in terms of pH, Eh and internal chemistry so as to maximize immobilization potential. Nickel, uranium and chromium and chloride are used as examples.

scholarly journals Use of Advanced Imaging Techniques for the Characterization of Oily Skin

2019 ◽  
Vol 10 ◽  
Author(s):  
Patricia M. B. G. Maia Campos ◽  
Maisa O. Melo ◽  
Daiane G. Mercurio
Keyword(s):  
Imaging Techniques ◽  
Advanced Imaging
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