Cement-based stabilization/solidification of radioactive waste

Abstract. Cementation of radioactive waste arising from nuclear facility operation and decommissioning is a common approach for its encapsulation, solidification, and disposal. Cementation offers significant advantages over other waste conditioning routes, such as thermal conversion of the waste to form ceramics or glasses including …

Optimization of plastic waste integration in cement bricks

The reason relies in the lower specific gravity of plastic compared to the other components. In addition, coarse aggregates share the highest ratio of weight reduction in relation to sand and cement; 20% replacement represents 11% of the total composite weight, while 20% of sand represents 6.7% and 20% of cement represents …

AREVA Experience in Cementation Technologies to …

AREVA is also the industrial operator of five radioactive waste cementation facilities in France. ... their size and the water / cement ratio: - Paste: consist of only cement and …

Concrete and cement composites used for radioactive waste …

The article is oriented to review the utilization of cement composites and concrete for radwaste solidification and final disposal with respect to the specifics of particular radwaste type management. 2. Radioactive waste classification. There are several schemes for radioactive waste classification, however the method of …

Decontamination and solidification of liquid radioactive waste …

This study is based on evaluation of solidification methods for low-level radioactive liquid using natural zeolite. In classical method, LLW is decontaminated using zeolite and after the process spent zeolite becomes radioactive waste. After decontamination process, zeolite waste is solidified using cement, sand and water. In …

CEMENTATION OF RADIOACTIVE WASTE FROM A PWR …

FIG. 2. OPC solidified waste. The cement composition, water/cement ratio and curing conditions are some aspects that will have an influence on the pore structure of the …

PRACTICAL MODEL OF CEMENT BASED GROUT MIX …

All of the mixes had various water-cement ratios (w/c) of 0.3, 0.5 and 0.7 respectively, using the same sand particle size distribution, according to figure 1. In this paper are showed the mix grout design based on sand 2. Fig. 1 - Sand particle size distribution. The grout mixes are presented in the table 2.

Concrete Calculator

Concrete Calculator. Our online tools will provide quick answers to your calculation and conversion needs. On this page, you can calculate material consumption viz., cement, sand, stone gravel for the following concrete mix ratios - 1:1.5:3, 1:2:4, 1:3:6, 1:4:8, 1:5:10. Once, the quantities are determined, it is easy to estimate the cost of a ...

Treatment and Conditioning of Nuclear Waste

Before disposal, nuclear waste needs to be in solid form and resistant to leaching. Packaging should be appropriate to the waste and its disposal. High-activity waste requires shielding. Treatment and conditioning processes are used to convert a wide variety of radioactive waste materials into forms that are suitable for their subsequent ...

Solidification/Stabilization Technology for Radioactive …

1.1. Radioactive Wastes. Nuclear energy, i.e., atomic energy, is that energy which lies in the nucleus of an atom, which is not only a promising non-fossil-based …

Nukem completes mock-up of waste cementation system

During barrel cementation, liquid radioactive waste is enclosed in a 200-litre barrel. The end products are externally uncontaminated steel drums containing immobilised waste in a cement matrix. ... "This milestone represents significant progress in the safe and efficient treatment of radioactive waste generated during the operation and ...

Progress in the immobilization of radioactive wastes in cement

The results revealed that the mixture proportions utilizing silica sand outperformed all other formulations in terms of compressive strength, and tensile strength with a value of 25.28 MPa, and 1.35 MPa, respectively, while dune sand performed the best in terms of shear strength 1.92 MPa with cement content of 40 % at 28 days.

Recent developments of radiation shielding concrete in nuclear …

When the expended nuclear waste is collected from the unit, ... 0.9–3.5% Fe 2 O 3 oxides and is employed as an alternative for the conventional cement and sand for RSC production. The density of GGBS lies between 3500 to 3800 kg/m 3 [62], ... Higher w/c ratio in the RSC results in a high volume of capillary water; if the concrete is wetted ...

Experimental study on shrinkage characteristics of …

Bentonite–sand mixtures have been proposed as the potential engineered barrier materials because of their low permeability and strong sealing ability under hydrated repository conditions. However, the mixtures may gradually lose water and shrink, which could compromise the engineering integrity of the barrier, under the environmental …

Immobilization of radioactive waste by cementation with …

Water/cement (W/C) ratio was determined in the laboratory by preliminary experiments. Depending on this W/C ratio, the sludge/cement ratio (S/C) varied between 0.3 ... as radioactive waste, by cementation in the presence of Moroccan natural red clay. 2021, Progress in Nuclear Energy ... 53 % of Portland cement class 45, (16.504 %.- X …

Recent Trends in the Evaluation of Cementitious Material in Radioactive …

The polymer–cement composite samples were prepared from recycled polyethylene terephthalate waste and cement paste (water/cement ratio of 40 %). The samples aged in their molds for 7 years, and then IAEA leaching test was used to evaluate the performance of these samples. ... Immobilization of radioactive waste by …

Immobilisation of Radioactive Waste in Cement | Semantic …

Application of inorganic cements to the conditioning and immobilisation of radioactive wastes. F. Glasser. Engineering, Environmental Science. 2011. Abstract: Portland cement is extensively used in the construction of nuclear waste facilities and as a matrix for shielding and immobilisation of radioactive species.

Radioactive Waste Cementation

Radioactive Waste Cementation. Rehab O. Abdel Rahman. Professor. Hot Laboratory and Waste Management Centre, Atomic Energy Authority of Egypt, Egypt. ... Operational and decommissioning activities of different nuclear facilities led to the generation of different radioactive waste streams. Fragmented solid wastes are …

Contribution of Metakaolin to the Confinement of Spent …

This study concerned the field of radioactive waste conditioning by cementation, involving the optimization of cemented radioactive spent resin form quality by the development of new formulations based on mixtures of Class 45 portland cement, sand, and water, with metakaolin (MK) as a mineral additive.

Joint IAEA-ICTP Virtual School Highlights Global Interest in

Cementation involves the mixing of radioactive waste in a specialized cement formulated to immobilize the radionuclides and limit their release during disposal. It is a well-established and proven process for preparing radioactive waste for storage and disposal. The technique is already employed by numerous countries and is suitable for …

CEMENTITIOUS COMPOSITES FOR IMMOBILIZATION OF …

1. INTRODUCTION. At present time in Russian Federation there are about 650 millions m3 of liquid and solid radioactive waste (RAW) with the total activity of over 6*1019 Bq [1]. The volume of low and medium-activity wastes considerably outnumbers the …

Radioactive Waste Cementation

Operational and decommissioning activities of different nuclear facilities led to the generation of different radioactive waste streams. Fragmented solid wastes are produced in the form of tailings during nuclear material mining, and during the operation and decommissioning of different nuclear facilities.

Influence and Possibility of Using Limestone Dust Replacement of Sand

This paper aimed to assess the potential of using limestone dust to replace sand at levels of 0, 20, 40, 60, 80 and by weight. Concrete mix design for cement : fine aggregate : coarse ...

Solidification of Radioactive Wastes Using Recycled …

2060 [6]. Most CW is classified as ultralow-level radioactive waste, constituting approxi-mately 60–80% of the total waste [11,12]. Aggregate and cement powder can be separated from CW using thermal and mechanical treatments, and the aggregate is generally fraction-ated into recycled coarse and fine aggregates based on …

Applications of Geopolymers in Concrete for Low-Level Radioactive Waste …

Abstract. The purpose of this mini-thesis research paper is to investigate the applications of geopolymer concrete as a replacement for ordinary Portland cement (OPC) concrete currently used for the containment and transportation of low-level radioactive waste in South Africa. Geopolymers are materials which are high in aluminosilicates and …

Utilization of Crushed Radioactive Concrete for Mortar …

In order to attain recycled sand usage ratio of 900kg/m3, the sand–cement ratio (s=C) was set at 1.30. Mix proportion for mortar is shown in Table 3. Bleeding, fluidity, and …

Immobilization of radioactive waste by cementation with …

DOI: 10.1016/S0956-053X(02)00036-3 Corpus ID: 33823466; Immobilization of radioactive waste by cementation with purified kaolin clay. @article ...

Solidification of radioactive wastes by cement-based materials

Sulfoaluminate cement (SAC) is a new high alumina cement widely used in radioactive waste solidification, the principal mineral of which is calcium sulfoaluminate (3CaCO 3 ž Al 2 O 3 ž CaSO 4 ). The SAC clinker was made by heating mixtures of …

Utilization of stone waste in the development of sustainable …

3. Utilization of marble waste in mortar production. Presently, India having the marble reserve as 1931 Mega tonnes underneath the earth crust [11].Till now exploited marble has afflict the waste problems due to its quarrying and processing activities [34].The quantity of marble waste generated from its sawing, grinding and polishing activities …

The Behaviours of Cementitious Materials in Long Term …

The publication can be used as a screening tool to identify cementitious systems and technologies to meet specific waste management objectives in terms of the conditioning …

AREVA Experience in Cementation Technologies to …

AREVA is also the industrial operator of five radioactive waste cementation facilities in France. ... their size and the water / cement ratio: - Paste: consist of only cement and water ... paste or fine mortars mixed with a low sand content - Mortars: mixture of cement, water and aggregates (sand) 1 . WM2014 Conference, March 2- 6, 2014 ...

Study of the spent resins confinement, as radioactive waste…

Cementation of radioactive waste resins in the presence of natural red clay was investigated. ... It is also based on the use of an inexpensive and widely available product such as cement, sand and water (Haddaji et al., 2020). ... (Hong and Glasser, 1999). A lower ratio allowedan efficient chemical incorporation of radioactive cation into …

Applications of Geopolymers in Concrete for Low-Level …

calcium-silicate-hydrate hydration reaction that occurs in traditional cement. The nuclear waste applications of geopolymers are investigated in the South African ... the …

Immobilization of radioactive waste by cementation with …

A study was undertaken to determine the immobilization performance of blended cement pastes contains different ratios of white sand (WS) loaded with cesium and cobalt radioactive ions.

Concrete Mix Ratio and How to Mix Concrete | DIY Doctor

1 part cement. In an ideal world, where everything is delivered dry, a water to cement ratio of approximately 0.55 should be used. As we have explained above, if requiring 25kg of cement in your mix, then to calulate the suggested volume of water it would be: 25 x 0.55 = 13.75kg (litres) of water.

Solidification of radioactive wastes by cement-based materials

Solidification is the most widely applied treatment method for radioactive waste, and cement is the most commonly used material for the immobilization of …