آخرین محصولات
Sorption Values for Caesium, Strontium, Radium, and Silver
As Kd from radwaste elemeats in concrete systems show a wide range of values, a modelling of cesium and lead immobilization in Calcium Silicate Hydrate (CSH, xCaO.SiO2.H2O, with 0.7 (aged cements ...
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Applied Sciences | Free Full-Text | Leaching Behavior …
The contamination of soils and groundwater with representative fission-product radionuclides such as Cs ... Wadachi, Y.; Ito, A. Leaching behavior of cesium-137 in cement-waste composites. …
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Historical Statistics for Mineral and Material Commodities in the
Cement, for example, was originally reported in barrels, the industry standard for much of last century, from 1972 to 1990 in short tons, and was switched to metric tons in 1991. From the mid-1980s to the early 1990s, most commodities switched to metric units. ... Cesium XLSX: 2018: NA: Chromium ... product, or firm names in ...
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Cabot Corporation | Specialty Chemicals and Performance Materials
Cabot Corporation (NYSE: CBT) is a leading global specialty chemicals and performance materials company that has delivered innovative performance solutions to customers for over 140 years. We are a leading provider of reinforcing carbons, battery materials, engineered elastomer composites, specialty carbons, fumed metal oxides, …
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Cement Products
GCC, a producer of cement and concrete in the United States and Mexico, named H&M Construction as the design-builder for its new K3 pyroprocessing…. cement, GCC, …
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Decontamination of radioactive cesium-contaminated soil/concrete …
Concrete as a building material contains a mixture of "cement" and "aggregates," with an abundance of ionic adsorption sites in a variety minerals and clay surfaces. For mortar and concrete, 137 Cs + ions can be sorbed within hardened cement paste (HCP) and aggregates (B. Yildiz, 2011), 2011).
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Cation exchange applications of synthetic tobermorite for the
Immobilization and solidification of hazardous cations like Cs137 and Sr90 are required while handling the radioactive waste of nuclear power plants. Efforts are on to find a fail proof method of safe disposal of nuclear wastes. In this context, various materials like borosilicate glass, zeolites, cements and synthetic rocks have been tried by several workers. This …
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Diffusion and sorption of cesium, strontium, and iodine in water
The sorption of radionuclides from potentially intruding groundwater at a nuclear waste repository is a major chemical function of backfill barriers. In this study, various materials (including clays, zeolites and an inorganic ion exchanger) were screened for the sorption of the fission products cesium and strontium in concentrated brines.
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Hanford Has a Radioactive Capsule Problem
At the Hanford Site, capsules of cesium and strontium are stored in concrete pools, whose water glows blue as the radioactive materials decay. At the vast reservation known as the Hanford Site in ...
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Cesium's Interaction in the Built Environment | US EPA
Cesium's Interaction in the Built Environment. Cesium chloride, even if it is deposited as a dry particle, will eventually become a liquid when exposed to relative humidity (RH) above 67% or to rain. Cesium-containing liquid droplets can easily be transported through porous materials or through surface cracks.
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Safety Data Sheet (SDS) Search
Search and filter Halliburton safety data sheets (sds) by products, hazardous material number, and SAP number.
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CN111551481A
The invention discloses a method for testing and characterizing the cesium ion permeation resistance effect of a concrete protective coating, which comprises the following steps: A. preparing two concrete round cake test blocks; B. coating protective coatings on the side surface and the upper surface or the lower surface of a test block, and maintaining …
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Download .nbib
This study reports on the efficacy of various wash solution formulations in removing cesium from components of concrete. We identified several prevalent mineral phases within a common concrete mix that dominate sorption of cesium, like those …
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What kills ants instantly
Here's how to do it step by step. First, locate your ant pile. Shouldn't be hard as they're swarming. What kills ants instantly - ant mount. Next, get your dish soap ready. Any kind will do. No need to get fancy. You'll want to squeeze a generous amount directly onto the ant pile and the trail leading up to it. What kills ants instantly.
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Immobilization of cesium and strontium radionuclides in zeolite-cement
2.7.. Static leaching testStatic leaching tests were preformed, using ground water solution, to study the leaching of cesium and strontium ions from hardened blocks of cement and cement mixed with 4 wt.% synthetic zeolite A.The IAEA's standard test proposed by Hespe [15] was applied. All prepared samples (2.0 cm diameter and 2.0 cm …
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Leaching of Cesium from a Cement Matrix | MRS Online …
The leaching rate of cesium has been studied in cement. The solidification matrix was a standard Portland cement with increased sulphate resisting properties mixed with 300 kg/m 3 or 350 kg/m 3 powdered ion exchange resins, and with or without 5 weight-% zeolite added to the grout. The leaching rates from an ordinary cement matrix and a …
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Elution control of radioactive cesium in MSWI fly ash using
Radioactive cesium found in municipal solid waste incineration (MSWI) fly ash can be easily eluted through contact with environmentally sourced water, such as rainwater. Dissolution suppression treatment of radioactive cesium, such as through cement solidification or geopolymer solidification, has been previously studied. …
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Cesium diffusion in mortars from different cements used in …
Cement-based materials are widely used for stabilizing and conditioning radioactive waste in low- and intermediate-level repositories. In this study, the adequacy of four different types of mortars, obtained from four different commercial cements, CEM I, II and IV (A and B), to act as barrier to 137 Cs migration was analysed. Diffusion …
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"COMPOSITIONAL ANALYSIS OF CERIUM AND CESIUM IN RAPID SETTING CEMENT …
A feasibility of rapid setting cement (RSC) as an agent of immobilization for certain elements such as fission products or radioactive materials was explored. Cerium (Ce) and cesium (Cs) have been selected as a surrogate for U and/or Pu and fission products, respectively, in this study in three phases. In Phase I, RSC was evaluated for physical properties (e.g., …
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Cleaning concrete contaminated with chemicals -- ScienceDaily
Researchers can expose a concrete block to a chemical, try to clean it and then detect the remaining chemicals, but that doesn't allow them to watch what is happening on the inside, Tenney ...
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Adsorption of cesium on cement mortar from aqueous solutions
1. Introduction. Radioactive cesium (137 Cs) is a common radionuclide that has a range of applications such as cancer therapy, radiation detection, mineral processing, and construction industry.Cesium is also one of the main products of nuclear fission and is therefore present in spent nuclear fuel [1], [2].Release of the radioactive cesium into …
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Diffusion of Chloride and Cesium Ions in Portland Cement Pastes …
Title: Diffusion of Chloride and Cesium Ions in Portland Cement Pastes and Mortars Containing Blast Furnace Slag and Fly Ash Author(s): D. M. Roy, A. Kumar, and J. P. Rhodes Publication: Symposium Paper Volume: 91 Issue: Appears on pages(s): 1423-1444 Keywords: blast furnace slag; blended cements; cement pastes; cesium; chlorides; …
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Measuring the Level of Bulk Solids Stored in Silos
Figure 1: Radar sensors are ideal for measuring level in tall silos that hold bulk solids. Oct 18, 2017. Guided wave radar (GWR), ultrasonic, and pulse radar are time-of-flight (TOF) technologies used to detect level by measuring the time it takes for a microwave or ultrasonic signal to be sent, reflect from the surface of the material being ...
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Adsorption of cesium on cement mortar from aqueous solutions
Experiments were carried out in a range of initial cesium concentrations from 0.0103 to 10.88 mg L (-1) and temperatures from 278 to 313 K using coupons of cement mortar immersed in the solutions ...
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Studies on the uptake of cesium by gel [KMg{sub 3}(Si{sub 3
Made available by U.S. Department of Energy Office of Scientific and Technical Information ...
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A case study of cesium sorption onto concrete materials and
The sorption and desorption properties of radionuclides onto common building materials such as concrete are critical factors in the improvement of techniques for mitigating a release of nuclear or radiological material to the urban environment. A potential option for the early phase response period is washing down contaminated concrete …
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Dielectric Constant Table
The products in this reference are listed in alphabetical order and are grouped in sections by the first letter of their name. ... (Cement ) 4.5 Balm, Refuse 3.1 Barium Chloride 9.4 Barium Chloride (Anhyd) 11.0 ... Cesium Iodine 5.6 Cetyl Iodide (68° F) 3.3 Charcoal 1.2-1.81 Chinaware, Hard 4-7
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A case study of cesium sorption onto concrete materials and evaluation
To support the viability of a wash-down approach to mitigating nuclear contamination, this study presents a characterization of the aggregate of a common concrete by optical microscopy and the sorption-desorption characteristics of cesium from these into potential wash solutions. Various minerals with weathered surfaces displayed …
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A case study of cesium sorption onto concrete materials and …
However, smaller particulates (<20 μm) and soluble fission product cations such as radioactive Cs + [8] may not be removed effectively [9]. ... [53] that because of the porosity of concrete, cesium can penetrate to a depth of 0.5–2 mm by hydraulic transport so that aggregate phases below the surface can provide binding sites. This suggests ...
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Cement-based stabilization/solidification of radioactive waste
Portlandite is relatively highly soluble compared to other cement hydration products, and is the primary buffer for the high pH of PC pore water, which is typically pH 12.5 (Taylor, ... 2007), and also the immobilization of cesium within the struvite structures (Wagh et al., 2016).
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