Said cementation method is also characterized in that the weight ratio of the silica sand (6) to the hydraulic solidification material (5) (the weight of the silica sand divided by the weight of the hydraulic solidification material) is between 1.5 and 3.0, inclusive.
Natural fractures in tight gas sandstones: a case study of …
In China, sandstone reservoirs with a measured porosity of < 10% and permeability < 1 mD at ambient laboratory conditions are categorized as tight sandstone reservoirs (Zou et al. Reference Zou, Yang, Tao, Yuan, Zhu, Hou, Wu, Sun, Zhang, Bai, Wang, Gao .
RADWASTE STREAMS TREATMENT AND CONDITIONING IN BELGIUM
cementation, bituminisation, vitrification,… Keywords: radwaste, treatment, conditioning, process, belgium I. INTRODUCTION Sources of Radioactive Waste. Original Belgian producers of radioactive waste are spread all over the country and they ...
diapirs and cryptoexplosive structures
sand increases due to cementation, but the change is not nearly as dramatic as with shale. when does salt become less dense than enclosing sediment? Below that would have positive buoyancy forces. 3000'' reasonable value, but varies highly dependent on diagenetic and loading history and on the ratio of shale to sandstone in the enclosing section.
The role of cementation in the behaviour of cemented …
· The cementation between sand grains and in sandstone acts as bonds between the individual grains, preventing movement of the grains before the cementation is broken ( Clough et al ., 1981 ). This results in behaviour similar to the behaviour …
CEMENTS IN RADIOACTIVE WASTE DISPOSAL
Like all materials, cement and concrete has a thermal coefficient, expanding with heat and contracting when cool. The magnitude of its coefficient depends in part on the mineralogical nature of the aggregate used is similar to that of steel and common rock types, ca. 7-10 ppm/ºC.
Frontiers | Microbial Degradation of Citric Acid in Low Level …
· Microbiological treatment of oil-containing radioactive waste prior to cementation. Radiochemistry 59, 193–202. doi: 10.1134/S106636221702014X CrossRef Full Text | Google Scholar
The relationships among brittleness, deformation …
· 1. Introduction  Mudstones are low-permeability sedimentary rocks with a high sorption capacity; consequently, they are important natural barriers in radioactive waste disposal facilities [Mazurek et al., 2003, 2008].However, when shear stresses induced by ...
Study of the Radioactive Silt Sediment Cementation …
· Radioactive silt deposits (RSD) of the spent fuel rod cooling pools were used as an object of these studies. In this paper the following techniques were considered for the silt processing: the cementation of silt without a prior treatment, cementation of the dried silt ...
Applied Numerical Modeling in Geomechanics – 2020 | …
· 105 papers have been selected for this symposium, entitled the 5th International Itasca Symposium on Applied Numerical Modeling, held on February 18-20, 2020 in Vienna, Austria. The papers are organized in areas of engineering applications including mining, underground construction, slope stability, hydraulic fracturing, nuclear waste disposal ...
Mudstone/sandstone ratio control on carbonate …
· Mudstone/sandstone ratio can be used to predict intensity of carbonate cementation. Abstract The eolian-fluvial sandstones of the Upper Permian Rotliegend formation, which were deposited in the Southern Permian Basin, are today deeply buried (~3–4 km) and constitute important gas reservoirs in the Netherlands and the southern North Sea.
ratio of sand stone in cementation radioactive waste,
Cements in Radioactive Waste Disposal MRS Bulletin 29/11/2013 Design of experiments to investigate main effects and all twofactor interactions when one of the factors has more than two levels—application to nuclear waste cementation Chemometrics and Intelligent Laboratory Systems, Vol 80, Issue 2, p 167
Formation Resistivity Factor | Fundamentals of Fluid Flow …
· Fundamentals of Fluid Flow in Porous Media Chapter 2 Formation Resistivity Factor Porous media consist of mineral, rock fragments and void space. The solids with exception of certain clay minerals (such as shaly sands where clay shales produce electrical conductivity) are nonconductive. Generally the electrical property of a rock depends on void space geometry […]
Evaluation of efficient cementation of fission 99Mo …
· Since the ratio of waste liquid increased with increases in the w/c ratio, the salt content in the cement waste form also increased. The samples used to test the final disposal facility acceptance criteria were prepared under the optimum conditions determined by the operating range experiment (Al 2 O 3 cake 30 wt% and w/c ratio 0.6).
brittle deformation regime of water-saturated siliceous …
· In the radioactive waste storage context it has been shown that the waste glass can interact with the natural host rock. Of the various host rocks considered, clays are often reported to delay the onset of the apparent silica saturation ( Curti et al. 1993 ), …
Use of variations in strontium isotope ratios for mapping …
· The U.S. Department of Energy''s Office of Scientific and Technical Information OSTI.GOV Conference: Use of variations in strontium isotope ratios for mapping barriers: An example from the Troll field, Norwegian continental shelf
Influences of Additives on the Performances of the …
· Abstract This paper studied the influences of additives with zeolite, vermiculite, silica fume and quartz sand on the performances of the cementation of simulated radioactive fluoride liquid wastes, which mainly contains Cs +, Sr 2+, F − −3 cm during 42-day leaching
APPLICATION OF SPENT CRT GLASS FOR LOW-LEVEL, MIXED, AND HAZARDOUS WASTE …
Radioactive wastes formed at Nuclear Power Plants (NPP) are stored at NPP territories. Low salt low level waste is subjected to cementation. Intermediate-level liquid waste is concentrated, followed by storage in barrels. Recently, vitrification of liquid
Effect of heat treatment on dynamic properties of …
· Temperature is one of the variables that influence the elasto-plastic behavior and integrity of rock outcrops. Fluctuations in temperature can trigger alteration of some of the mineral properties and impact the brittle-plastic transition. Initiation and propagation of thermally induced tension cracks tend to weaken most rock types. The principal goal of this study was to anticipate impacts of ...
Immobilization of radioactive waste by cementation with …
· Depending on this W/C ratio, the sludge/cement ratio (S/C) varied between 0.3 to 0.8. But for the purpose of this study, W/C was determined to be 0.43. …
Biocementation can be defined as the soil improvement process through the production of particle-binding materials via microbial means. It is mainly used in geotechnical engineering applications for strengthening, plugging and improving soils (Ferris et al., 1997; …
Applications of borehole nuclear magnetic resonance geophysical logging to hydrogeological investigations of low permeability …
INTRODUCTION Nuclear magnetic resonance logging is a technique used to identify hydrocarbons and predict their pro-ducibility (Allen et al., 1997). The unique advantage that NMR provides is a measure of pore size distribu-tion independent of lithology. In the oil
Storage of Radioactive Materials
Radioactive wastes can be found in solid, liquid and gas states, and are classified into three groups: Low level waste (LLW) (of order ∼104 Bq/l) Intermediate level waste (ILW) (of order ∼107 Bq/l) High level waste (HLW) (of order ∼1010 Bq/l)
Approaches to Modeling Coupled Flow and Reaction in a 2 …
· Porosity evolution at reactive interfaces is a key process that governs the evolution and performances of many engineered systems that have important applications in earth and environmental sciences. This is the case, for example, at the interface between cement structures and clays in deep ...
Variability in temperature of the smectite/illite reaction in …
Variability in temperature of the smectite/illite reaction in Gulf Coast sediments † - Volume 24 Issue 2 To send this article to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document
Investigation of the Immobilization of the Radioactive Ion …
KEYWORDS: optimization, mixture design, cementation, spent resins I. Introduction Ion exchange is one of the most common and eﬀective treatment methods for liquid radioactive waste. It is a well-developed technique that has been employed for many years in ...
Management of liquid radioactive waste
In-drum cementation is the standard solution for cementation of liquid radioactive waste inside a 200 l drum. The In-Drum Mixer is a combination of a planetary mixer with counter-rotating, double helical mixer elements. It is a well proven technology, and the ...
SELECTION TESTS FOR RECYCLED RADIOACTIVE SAND OBTAINING METHOD
Until now the solid low activity radioactive waste (LLW) was pre-placed in containers and cementation with mortar made from cement and natural fine aggregates, providing a fill ratio of the container of approximately 50 vol. % for concrete. Ishikura et al. [1, 2
Establishment of cementation parameters of dried waste from …
The next step was the cementation of the dry waste. An important cementation parameter, to a good waste product, is the water/cement (w/c) ratio defined in Equation 1. A w/c range from 0.24 to 0.35 was used to solidify the waste. The cementation was
Determination of 135Cs concentration and 135Cs/137Cs …
· Determination of 135 Cs concentration and 135 Cs/ 137 Cs atomic ratio is of great importance in characterization of radioactive waste from decommissioning of nuclear facilities this work, an effective analytical method was developed for simultaneously ...
New Solidification Materials in Nuclear Waste Management
effects from the decay of radioactive elements . 2.1. Cement Waste Forms Cementation is the most practical and economical method for immobilization of nuclear wastes. The cement is prepared by mixing the waste and cement composition in ratio 1:1.
Sherwood sandstone group
· Sherwood sandstone group. The Sherwood Sandstone Group, formerly known as the Bunter Sandstone, predominantly comprises sandstone and pebbly sandstone with lesser amounts of conglomerate and minor amounts of mudstone and siltstone. It was deposited between 230 and 260 million years ago in the late Permian and Triassic periods.
Development of cement solidification process for …
· Ordinary portland cement (OPC) and some additives were used for the solidification. Solidified cement prepared from powdered waste with a Na/B mole ratio 0.24 and having a high silica sand content (silica sand/cement>2) showed to improved uniaxial
Optimization of Radioactive Waste Cementation for …
Abramenkova, G, Abramenkovs, A, & Klavins, M. "Optimization of Radioactive Waste Cementation for Decommissioning of Salaspils Research Reactor." Proceedings of the ASME 2011 14th International Conference on Environmental Remediation and.
THE VALORISATION OF THE CRT GLASS AS POZZOLANA …
It is known that cementation by use of special composition fluid mortars (grouts) offers the means to encapsulation of low and medium level radioactive waste, in solid state as well as in different forms of sludges and precipitates/gels or activated materials.
Cement Hydration Reaction
17.6 Cementation of Radioactive Wastes The practice of encapsulating radioactive waste in OPC began during the early years of the nuclear industry (IAEA, 1993). This was primarily due to its low cost, availability and compatibility with aqueous waste.
Incorporation of strontium and calcium in geopolymer …
Radioactive waste streams containing 90 Sr, from nuclear power generation and environmental cleanup operations, are often immobilised in cements to limit radionuclide leaching. Due to poor compatibility of certain wastes with Portland cement, alternatives such as …
Open Science Index
The rate of copper cementation on iron rod was investigated. The study was mainly dedicated to illustrate the effect of application of electromagnetic field (EMF) on the rate of c
ratio of sand stone in cementation radioactive waste
ratio of sand stone in cementation radioactive waste Samples formulated with hydraulic cement were analyzed to investigate the effects of resin type, resin loading, waste-to-cement ratio, and water-to-cement ratio. The solidification of cation resin wastes with ...
Professor John L Provis | Materials Science and …
· Workshop in Waste Cementation, 17 September 2014 - 17 September 2014. Provis JL, Bernal Lopez SA, Ismail I, San Nicolas R, Brice DG & van Deventer JSJ () Comparing the influence of fly ash on the durability properties of Portland cement-based and alkali-activated slag-based concretes.
Journal of Rock Mechanics and Geotechnical Engineering
Within the framework of feasibility studies for a reversible, deep geological repository of high- and intermediate-level long-lived radioactive waste (HLW, IL-LLW), the French National Radioactive Waste Management Agency (Andra) is investigating the Callovo-Oxfordian (COx) formation near Bure (northeast part of France) as a potential host rock for the repository.
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