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Leaching performance of concrete based on studies of

5.7 Effect of water/cement ratio and degree of hydration on leaching rate 41 6 Models for determining the rate of leaching 43 6.1 Basic formulas 44 6.2 Effect of type of cement, silica fume and w/c ratio on diffusion rate 47 Nuclear waste must be isolated for a very long time in such a way that it does not harm the present or future

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ASTM-C1220 Standard Test Method for Static Leaching of

1.1 This test method provides a measure of the chemical durability of a simulated or radioactive monolithic waste form, such as a glass, ceramic, cement (grout), or cermet, in a test solution at temperatures 100 C under low specimen surface- area-to-leachant volume (S/V) ratio conditions.

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Development of Ecofriendly Concrete Incorporating Recycled

Jul 03, 2015Development of Ecofriendly Concrete Incorporating Recycled High-Impact Polystyrene from Hazardous Electronic Waste A total of 486 concrete specimens were cast to investigate the effect of HIPS and watercement ratio on the fresh and hardened properties of concrete. Toxic, and Radioactive Waste. Vol. 19, Issue 3 (July 2015)

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Hydration of MgO-Based Cement Water Dynamics by

cement, has been assessed.5−9 In addition, formation of M-S-H has been found in key environments related to cement applications, such as at the interfacial zone between low-pH Portland-based cements and clays used in multibarrier radioactive waste repositories10,11 and on the surface of Portland cement pastes and concrete subjected to sulfate

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Concrete Wikipedia

Concrete, usually Portland cement concrete, is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens over time—most frequently a lime-based cement binder, such as Portland cement, but sometimes with other hydraulic cements, such as a calcium aluminate cement.

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Nuclear Logging Environmental Geophysics US EPA

Nuclear-logging techniques described in this manual include gamma, gamma spectrometry, gamma-gamma, and several different kinds of neutron logs. Radioactivity is measured by converting the particles or photons to electronic pulses, which then can be counted and sorted as a function of their energy.

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Characterization of Sodium Silicate-Activated Portland

The cement/silicate method of solidifying wastes was investigated. Emphasis was placed on the interaction between aqueous sodium silicate and portland cement hydration reactions. A definition of the role which the alkali- silicate plays in increasing the ability of cement hydration reactions to immobilize waste ions was the principal objective.

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Treatment of PWR evaporator concentrates Nuclear

Cementation may be difficult because their main constituents are highly soluble salts. Borates also interact with cement. We have designed a process named SOGEBOR which enables the separation of borated compounds from radioactive waste, and immobilization of the radioactive non-soluble solid into a

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Studies Of Cement Grouts And Grouting Techniques For

A cement-based grout (90% Type 50, 10% silica fume, 0.4 water-to-cement ratio, w/c 0.6) has been used in field trials at AECL's Underground Research Laboratory in Canada and at the OECD/NEA Stripa Mine in Sweden, to evaluate suitable grouts and grouting techniques that could be used for sealing a nuclear fuel waste disposal vault mined deep in granite.

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Encapsulation and Immobilization of Medical Waste

The cement itself is sufficient to isolate the waste from the environment. You do not want large chunks of waste going into the mixer. The more homogeneous the better. Small pieces of solid waste have a higher surface area to volume ratio than large pieces, and the inetization is

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PRELIMINARY STUDY OF THE UTILIZATION OF THE FLY ASH

Preliminary study of the utilization of the fly ash from coal-fired power plant for immobilizing simulated radioactive waste has been done. The objective of this research was to study characteristics of pozzolanic material of the fly ash from coal-fired power plant as substitute of compactor material for immobilizing simulated radioactive waste.

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Characterization ofRadioactive Wastes Incorporated in a

Characterization ofRadioactive Wastes Incorporated in a Cement Matrix E.R. Merz, D. Dyckerhoff, and R. Odoj Institute of Chemical Technology Kernforschungsanlage Jiilich D-5170Jiilich, FRG Abstract The incorporation of radioactive material in cement mixtures is acommonly used procedure for conditioning various kinds of low-and medium

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Chapter 14 Treatment of Radioactive Wastes Engineering360

home reference library technical articles materials and chemicals chapter 14 treatment of radioactive wastes An Introduction to Nuclear Waste Immobilisation Covering all important aspects of immobilization, from nuclear decay, to regulations, to new technologies and methods, this text gives significant focus to the analysis of the various

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US4664895A High concentration boric acid solidification

A process is described for the solidification of concentrated boric acid waste solutions. The waste solution must have a boric acid concentration greater than 30% by weight. Sodium metasilicate is added to the boric acid waste solution and is mixed; a dry, hard product is formed. The process is not hindered by the presence of up to 40% dewatered bead resins.

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Comparison of calorimetric methods for the assessment of

ABSTRACTThis study aims to contribute to future-proofing the supply of cement powders for the UK's nuclear waste cementation program, by enabling rapid and reliable assessment of heat evolution from candidate grout formulations. Isothermal conduction calorimetry and semi-adiabatic calorimetry experiments were carried out at room temperature, to monitor the heat of hydration of blended blast

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Advances In Encapsulation Technologies For The Management

Technical Report Advances in Encapsulation Technologies for the Management of Mercury-Contaminated Hazardous Wastes Contract GS-10F-0275K Task Order No. 0001 Submitted to U.S. Environmental Protection Agency National Risk Management Research Laboratory 26 W. Martin Luther King Drive Cincinnati, OH 45268 Paul M. Randall Task Order Project Officer Prepared by Sandip

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Class Definition for Class 588 HAZARDOUS OR TOXIC WASTE

SECTION I CLASS DEFINITION. This is the generic class for (1) hazardous or toxic waste destruction by any means to include, heating, chemical action, or the interaction with any form of radiation; (2) permanent containment of hazardous or toxic waste by methods to include storage in a simple container, solidification, vitrification, cementation, and more elaborate methods of storage

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Method for storage of solid waste The United States of

Sep 28, 1976These and other objects of the invention may be met by mixing cement powder with the solid calcined high-level radioactive waste in a ratio of from about 1 part cement powder to from about 3 to about 10 parts by weight of calcine before the calcine is placed in the metal canister and sealed for storage in a moisture-containing environment.

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William J MechamBuilding material Cement Metal Portland cement Municipal solid waste Atmosphere

Method of cementing radioactive waste and cemented body

May 19, 1992The present invention relates to a method of cementing a radioactive waste and a cemented body thereof which are less liable to bring about radioactivity leakage for a long period of time and suitable for disposal of cemented bodies of radioactive wastes in the land.

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Kiyomi Funabashi Osamu Kuriyama Koichi Chino Tsutomu Baba Takashi Nishi

Novel Fibrous Concrete Mixture Made from Recycled PVC

Apr 02, 2017Electronic waste (e-waste) in concrete is the new revolutionary concept of sustainable concrete because it reduces the environmental pollution and solid waste problem. In this paper the extracted outer casing insulation of electrical wire was made into fibers.

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Radioactive Waste Management In Indonesia Digilib

The structure of the radioactive waste management in Indonesia is illustrated in Figure 1. The structure shows the promotion side as well as the regulation side. On the promotion side, the National Atomic Energy Agency and the Ministry of Science and Technology, set ttp the plans and coordinate research and development activities.

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The Carbonized Life of Fiber Reinforced Concrete Nuclear

The hybrid fiber reinforced concrete containers for keeping nuclear waste (NWSC) were made by the concrete which mixed polypropylene fibers (0.9kg/m3) and 20mm basalt fiber (2.5kg/m3). The carbonation depth model was established by analyzing carbonation depth of ordinary concrete and hybrid fiber reinforced concrete that through the accelerated carbonization testing.

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Use of magnesia cement in industrial waste cementation

1 34th Cement and Concrete Science Conference Paper Number 185 14-17 September 2014 Use of magnesia cement in industrial waste cementation Th. Zampetakis, H. Yiannoulakis and A. Meidani RD Center, Grecian Magnesite S.A., Thessaloniki, Greece

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Utilization of Coal Ash as a Barrier Material for

About 10% of total electricity (386 MkW) was generated by nuclear power plants in the world (2014) and about 58,400 tons of uranium has been mined in uranium mines annually. A plenty of radioactive waste material is produced from uranium mines and nuclear power plants. The wastes must be disposed or stored safely for a long term. Because if they leak and/or move from disposal or storage sites

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'Waste Form Qualification Report WVDP Stabilized Sludge

waste form. The resulting Class C cement-waste is described in a previous topical report 'Cement Waste Form Qualification Report WVDP PUREX Decontaminated Supernatant (Reference 2). Cement-waste drums were made up through November, 1990. The next pretreatment step is being implemented at the WVDP. The HLW in

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Diffusion mechanism of water and ions in hardened cement

Water-to-cement ratio dependence of diffusion behavior of Na and Cs The cement-solidified radioactive waste in drums will be placed into concrete pits in disposal tunnels, and the space between the waste and the pit walls will be filled with cement-based materials. In addition, low diffusion layer

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CURRENT STATUS OF NEAR SURFACE DISPOSAL PROGRAM

Siting of radioactive waste disposal facilities is an important step in developing a waste disposal system that would best suit the needs for accommodation of wastes from a national nuclear programme and simultaneously satisfy all relevant safety, technical and environmental

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Applications of Green Composites in Immobilization of

Oct 10, 2017A direct encapsulation of solid cellulosic-based waste simulate in cement without any treatment and that for immobilization of the bioproduct generated from the biodegradation process revealed an improvement in physical, mechanical and chemical characterizations of the final waste form following the second route.

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C. WASTE MANAGEMENT Bhabha Atomic Research Centre

BARC HIGHLIGHTS78 Nuclear Fuel Cycle Waste Management Low Intermediate Level Waste 12.2 BIODENITRIFICATION OF EFFLUENTS Management of nitrates present in various liquid radioactive waste streams is a challenging task. The reprocessing of spent fuel results in low and intermediate level waste containing substantial quantity of sodium nitrate.

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Portland cement Wikipedia

Portland cement is also used in mortars (with sand and water only), for plasters and screeds, and in grouts (cement/water mixes squeezed into gaps to consolidate foundations, road-beds, etc.). When water is mixed with Portland cement, the product sets in a

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