Sorption Values for Caesium, Strontium, Radium, and Silver
4.1.2.1 Cement Pastes R d Values. Figure 4.1b shows the results from the literature review on R d values in pure cement systems, i.e. hardened cement paste without ballast or additional aggregates. All experimental data mentioned in Table A.3 (see Annex) are shown with the exception of two data points from Ochs et al. because they were …
Effects of ferrihydrite nanoparticle incorporation in …
To enhance the long-term immobilization of radioactive wastes, ferrihydrite nanoparticles were incorporated into cementitious materials. The effects of ferrihydrite nanoparticles on the physicochemical and mechanical properties of cementitious materials and the immobilization of uranium (U), strontium (Sr) and cesium (Cs) were investigated.
The mechanism of cesium immobilization in densified silica …
@article{osti_21130723, title = {The mechanism of cesium immobilization in densified silica-fume blended cement pastes}, author = {Bar-Nes, G and Faculty of Civil and Environmental Engineering, Technion, Haifa and Katz, A and Peled, Y and Zeiri, Y and Department of Bio-Medical Engineering, Ben-Gurion University, Beer-Sheva}, …
Adsorption characteristics of cesium onto calcium …
The concrete building and paved roads in the urban areas can be exposed to cesium (Cs+) in case of the accidental release to environment. The adsorption kinetics of …
Cesium and Lead Uptake by CSH Phases of Hydrated …
As Kd from radwaste elements in concrete systems show a wide range of values, a modelling of cesium and lead immobilization in Calcium Silicate Hydrate (CSH, …
Caesium sorption by hydrated cement as a function of …
Cs and Pb uptake by CSH phases of hydrated cement. Material Research Society Symposium Proceedings, 663, 105-113] for Cs sorption on synthetic CSH phases was simplified to facilitate its application to whole HCP and mortars or concrete, following re-assessment of the model parameters. All measurements were compared with model …
Assessment the leaching characteristics and long
@article{Sami2021AssessmentTL, title={Assessment the leaching characteristics and long-term leaching behavior of some radionuclides from synthesized zeolite cement matrix}, author={Nesreen M. Sami and Ola A. Abdel Moamen and M. I. El-Dessouky and Ahmed Mohamed El-kamash}, journal={Cement and Concrete …
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 …
TECHNICAL 93-29 REPORT
cement paste of sulfate resistant cement, blast furnace slag cement, fly ash cement, aluminate cement, and silica cement have been used. Also three different samples of very old (ca 70 years) Portland concrete taken from hydropower dams have been included. Also the effect of organic additives to the concrete was studied for the actinides. The
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Abstract. 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 …
A Review on Radiation Damage in Concrete for Nuclear
Concrete is a relatively cheap material and easy to be cast into variously shaped structures. Its good shielding properties against neutrons and gamma-rays, due to its intrinsic water content and relatively high-density, respectively, make it the most widely used material for radiation shielding also. Concrete is so chosen as biological barrier in …
Editors' Choice—Review—Electro-Kinetic Decontamination
In respect of cesium in concrete, Nikolayev et al. suggested that clayey minerals and cement binder is the main source of cesium in concrete. 64 In addition, they suggested that 30–50% of the 137 Cs in concrete is in a fixed form, and only 5% of the total amount of 137 Cs is highly fixed in concrete. Cesium is one of the elements that ...
Thermodynamic Modeling Using Extended UNIQUAC and …
Request PDF | On Jan 1, 2023, Mouad Arrad and others published Thermodynamic Modeling Using Extended UNIQUAC and COSMO-RS-ES Models: Case Study of the Cesium Nitrate - Water System Over a Large ...
Leaching kinetics of 137Cs and 60Co radionuclides fixed in cement …
Studying cesium (Cs) releases from cementitious waste matrices has received considerable attention; this is attributed to the low sorption potential of cement towards cesium and cesium solubility ...
Batch-type study of Cs, Co, and Tc binding with hydrated cement …
Materials and reagents Portland cement. Commercial Portland cement (CEM II/A—LL 42.5 W, producer—JSC Akmenės Cementas, Lithuania) was used to study Cs +, Co 2+, 99 Tc sorption/desorption kinetics and to determine the distribution coefficient (K d) of these elements in the HCP.. The chemical composition of cement was …
Impact of Aggregate–Cement Paste Reaction Forming Al
In concrete structures intended for long-term use, the diffusion properties change over time with possible chemical reactions that may happen in the concrete. In this study, we performed a two-week cesium chloride diffusion test on five cored samples from different walls in a nuclear power plant. The reaction between feldspar group aggregates …
The mechanism of cesium immobilization in …
The mechanism of cesium immobilization in densified silica-fume blended cement pastes. Full Record. Related Research. Abstract. The role of silica-fume …
The mechanism and behavior of cesium adsorption …
In this study, microstructural differences and changes in the adsorption capacity of cesium between cement and carbonated cement were investigated. Ce…
(PDF) Leaching and Mechanical Properties of …
The leaching behavior of cesium -134 (Cs-134) from cement mixed with 5%, 11% and 18% of biochar has been investigated accordance with the ANSI/ANS 16.1-2003 method. The leachate was collected and ...
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 ...
CN103946924A
The invention provides a method for removing, at a low cost, radioactive cesium from wastes containing radioactive cesium, and a facility therefor. The facility (1) for the removal of radioactive cesium, is provided with: an incinerator (22) for burning and incinerating combustible wastes which are contaminated with radioactive cesium; a suspension …
Caesium sorption by hydrated cement as a function of
Cs and Pb uptake by CSH phases of hydrated cement. Material Research Society Symposium Proceedings, 663, 105-113] for Cs sorption on synthetic CSH phases was simplified to facilitate its application to whole HCP and mortars or concrete, following re-assessment of the model parameters. All measurements were compared with model …
Adsorption of cesium on cement mortar from …
In this case, cesium can interact with cement mortar or concrete if cesium is present in radioactively contaminated water. Second, cesium can strongly bind to …
Radionuclide Basics: Cesium-137 | US EPA
Cesium binds strongly to soil and concrete, but does not travel very far below the surface. Plants and vegetation growing in or nearby contaminated soil may take up small amounts of Cs-137 from the soil. Small quantities of Cs-137 can be found in the environment from nuclear weapons and from nuclear reactor accidents. Cesium Sources
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 …
Decontamination of radioactive concrete using …
The experimental results of the electrokinetic decontamination with 0.01 M of nitric acid were that the cesium ions were removed by up to 52% from the concrete after 15 days, also the cobalt ions were only removed by up to 0.7%. The concrete should be washed with H2SO4 as a pretreatment before electrokintic decontamination to lower its …
Review—Electro-Kinetic Decontamination of Radioactive …
In respect of cesium in concrete, Nikolayev et al. suggested that clayey minerals and cement binder is the main source of cesium in concrete.64 In addition, they suggested that 30–50% of the ...
A case study of cesium sorption onto concrete materials …
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Diffusion and sorption of cesium, strontium, and iodine in …
@article{osti_6982185, title = {Diffusion and sorption of cesium, strontium, and iodine in water-saturated cement}, author = {Atkinson, A and Nickerson, A K}, abstractNote = {Diffusion and sorption in cementitious materials are important factors influencing radionuclide migration in radioactive waste disposal. Four different experimental …
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