Pozzolanic filtration/solidification of radionuclides in nuclear reactor cooling water

Englehardt, James D.; Peng, Chengjun

doi:10.1016/0956-053x(96)00015-3

Cited by 14 publications

(7 citation statements)

References 5 publications

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“…It is possible to selectively replace the potassium with single-charged cations of low hydration energy and small radius-Cs + , Rb + , Li + , or NH 4 + in such damaged areas. A similar approach has been confirmed in subsequent studies [40,46,47]. Therefore, relatively high Cs sorption onto glauconite can be explained by high selectivity of its sorption sites towards this cation.…”

Section: Cesium Sorptionsupporting

confidence: 63%

Cesium Sorption and Desorption on Glauconite, Bentonite, Zeolite, and Diatomite

et al. 2019

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This study is devoted to studying the sorption of 137Cs on mineral sorbents at a wide pH range, from 2 to 10, as well as to studying sorption mechanisms. In order to obtain the most reliable sorption characteristics, samples of high purity were examined as sorbents: bentonite, glauconite, zeolite, and diatomite. A detailed description of their mineral composition, cation exchange capacity and specific surface of sorbents is given. XRD, XRF, FTIR, SEM, and BET adsorption methods were used for assaying. The sorption and desorption values were identified for each sorbent. As a result of the conducted research, it can be concluded that 137Cs sorption mainly occurs through the exchange reaction on zeolite, glauconite and bentonite. The highest cesium Kd was observed on zeolite due to its high CEC and amounted to 4.05 mg/L at pH 7. The higher sorption capacity of glauconite in comparison with bentonite is primarily due to the high layer charge which is mainly localized in tetrahedral sheets, and to the existence of highly selective sorption sites (frayed edge sites) on the glauconite surface. Diatomite showed the lowest sorption capacity provided by the presence of a small quantity of smectite and kaolinite in its composition. The values of desorption increase in the following order: zeolite < bentonite ~ diatomite < glauconite.

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Section: Cesium Sorptionsupporting

confidence: 63%

Cesium Sorption and Desorption on Glauconite, Bentonite, Zeolite, and Diatomite

et al. 2019

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“…15% of GSA blended concrete started its strength increase from 200 days with compressive strength of 21.8N/mm 2 . The trend of results obtained from this study collaborate findings of earlier studies by Englehardt et al 1995 that pozzolanlime reactions are usually slow, starting after one or more weeks and that the behavior of the delay in pozzolanic reaction will result in more permeable concrete at early ages and gradually becomes denser than plain concrete with time. The effect of the pozzolanic reaction produces more cement gel (i.e.…”

Section: Compressive Strengths Of Binary Blended Concrete and Opc At supporting

confidence: 89%

Investigation of the Compressive Strength and Curing Duration of Binary Blend of Groundnut Shell Ash Concrete

Umasabor

Okovido

2017

Nig. J. Env. Sci. & Tech.

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This paper studied the evaluation of the compressive strength of the binary blend of groundnut shell ash concrete and curing period. The purpose of the study was to source for local materials like agricultural waste that could replace some percentages of cement in order to make it more economical in concrete in order to ascertain its usefulness in the construction industry. An experimental (quantitative) method was adopted as the research design in this work. The total concrete specimens of size 100mm x100mm produced in the laboratory were one hundred and twenty (120). The groundnut shells were completely burnt in an electric furnace to obtain the ash and 0%, 5%, 10% and 15% of the ashes were used to replace cement for a designed mix of concrete strength of 20N/mm2 at w/c ratio of 0.6, after varying the w/c ratios from 0.4 to 1.0, according to basic guidelines stated in Department of Environment method. They were cured at 7 days, 28 days, 30 days, 60 days, 90 days, 120 days, 150 days and 200 days. The concrete cubes were taken to the compression machine for compression test. The result shows that compressive strength of the groundnut shell ash concrete increases as the curing period increases and there was decrease in the compressive strength of the pozzolanic concrete as the percentages of groundnut shell ash increases in the concrete. The binary blend of groundnut shell ash at 5% replacement had the maximum compressive strength of 23.3N/mm2 at 200 days while the control concrete compressive strength was 22.0N/mm2. This represents an increment of 1.06% of compressive strength over the control at 200 days.

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“…When PC is placed in contact with water, several chemical reactions occur (Hewlett 2003;Taylor 1997). These reactions produce many phases, such as calcium silicate hydrates (C-S-H gel), calcium hydroxide (CH or portlandite), ettringite (AFt), and monasulfomonite (AFm) (Englehardt and Peng 1995;Hewlett 2003). To ensure the continuity of cement hydration, the cast mixture should be cured under appropriate conditions (Mehta and Monteiro 2006;Topçu and Uygunoglu 2007).…”

Section: Introductionmentioning

confidence: 99%

Effect of Autoclave Curing on the Microstructure of Blended Cement Mixture Incorporating Ground Dune Sand and Ground Granulated Blast Furnace Slag

Alawad

Alhozaimy

Jaafar

et al. 2015

International Journal of Concrete Structures and Materials

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Investigating the microstructure of hardened cement mixtures with the aid of advanced technology will help the concrete industry to develop appropriate binders for durable building materials. In this paper, morphological, mineralogical and thermogravimetric analyses of autoclave-cured mixtures incorporating ground dune sand and ground granulated blast furnace slag as partial cementing materials were investigated. The microstructure analyses of hydrated products were conducted using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), differential thermal analysis (DTA), thermo-graphic analysis (TGA) and X-ray diffraction (XRD). The SEM and EDX results demonstrated the formation of thin plate-like calcium silicate hydrate plates and a compacted microstructure. The DTA and TGA analyses revealed that the calcium hydroxide generated from the hydration binder materials was consumed during the secondary pozzolanic reaction. Residual crystalline silica was observed from the XRD analysis of all of the blended mixtures, indicating the presence of excess silica. A good correlation was observed between the compressive strength of the blended mixtures and the CaO/SiO 2 ratio of the binder materials.

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Pozzolanic filtration/solidification of radionuclides in nuclear reactor cooling water

Cited by 14 publications

References 5 publications

Cesium Sorption and Desorption on Glauconite, Bentonite, Zeolite, and Diatomite

Cesium Sorption and Desorption on Glauconite, Bentonite, Zeolite, and Diatomite

Investigation of the Compressive Strength and Curing Duration of Binary Blend of Groundnut Shell Ash Concrete

Effect of Autoclave Curing on the Microstructure of Blended Cement Mixture Incorporating Ground Dune Sand and Ground Granulated Blast Furnace Slag

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