Sorption behavior of strontium onto C-S-H (calcium silicate hydrated phases)

Iwaida, Takeshi; Nagasaki, Shinya; Tanaka, Satoru

doi:10.1016/s0167-2991(01)82232-1

Cited by 10 publications

(10 citation statements)

References 2 publications

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“…2 No indication of concentration at which precipitation began. 3 [Cu(aq)] after precipitation = 1 ppm. 4 Solubility limit ~10 -10 mol dm -3- [99].…”

Section: Discussionmentioning

confidence: 99%

“…This suggests that sorption was mainly determined by Ca:Si ratios, regardless of crystal structure. Iwaida et al [3] observed a shortening of the silicate chains in CSH which had sorbed Cs, indicating breakage of the silicate chains had occurred.…”

Section: Caesiummentioning

confidence: 99%

“…Another, with a shorter lifetime (>0.4 ms), was interpreted as a site with a high hydroxylated environment, but one that is less than that of Eu(OH) 3 , which corresponded to surface complexation or precipitation at around 10 -10 mol dm -3 . The authors thought it reasonable that Eu might be withdrawn from the liquid phase by a simple precipitation process, due to its low solubility limit, but results showed that this was not the case.…”

Section: Europiummentioning

confidence: 99%

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Binding mechanisms of radionuclides to cement

Evans

2008

Cement and Concrete Research

132

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Radionuclide solubility is one of the factors that can determine the 'source term' for potential migration to the far field. Hence, the mechanisms of immobilisation of radionuclides in cements need close study in order to quantify the nature of the binding. The nature of the binding forces in a cement matrix is very species sensitive, so it is difficult to produce a general description. This review summarises the main sorption mechanisms and then details immobilisation mechanisms for many elements.

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“…2 No indication of concentration at which precipitation began. 3 [Cu(aq)] after precipitation = 1 ppm. 4 Solubility limit ~10 -10 mol dm -3- [99].…”

Section: Discussionmentioning

confidence: 99%

Section: Caesiummentioning

confidence: 99%

Section: Europiummentioning

confidence: 99%

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Binding mechanisms of radionuclides to cement

Evans

2008

Cement and Concrete Research

132

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“…Indeed, several studies report cationic and anionic sorption on concrete, cement, as well as on pure cement phases (e.g. Aimoz et al, 2012aAimoz et al, ,b, 2013Atkinson and Nickerson, 1988;Baur and Johnson, 2003;Birnin-Yauri and Glasser, 1998;Bonhoure et al, 2006;Cornelis et al, 2012;Gougar et al, 1996;Iwaida et al, 2001;Johnson et al, 2000;Kindness et al, 1994;Miller et al, 2000;Moulin et al, 2000;Pointeau et al, 2008;Pollmann et al, 2006;Segni et al, 2006;Tits et al, 2011;Van Es et al, 2015). Some authors highlight a possible long-term stabilization of the sorbed elements, if phases remain at equilibrium with the surrounding pore water (Cornelis et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Dissolution kinetics of hydrated calcium aluminates (AFm-Cl) as a function of pH and at room temperature

et al. 2017

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International audienceThe determination of reliable weathering/dissolution rates for cement phases is of fundamental importance for the modelling of the temporal evolution of both radioactive waste repositories and CO 2 geological storage sites (e.g. waste matrix, plug in boreholes). Here, the dissolution kinetics of AFm-Cl (hydrated calcium aluminates containing interlayer Cl) has been studied using flow-through experiments conducted at pH values ranging from 9.2 to 13. Mineralogical (XRD) and chemical (EPMA, TEM) analyses have been performed to determine the evolution of the phases during the dissolution experiments. For pH values between 10 and 13, the dissolution of AFm-Cl is congruent (i.e. Ca/Al ratios close to 2 both for solids and outlet concentrations). In contrast, the precipitation of amorphous Al-phases and possibly amorphous mixed Al/Ca phases is observed at pH 9.2, leading to Ca/Al ratios in the outlet solutions higher than those of the initial solid. Therefore, at pH 9.2, even if Cl – /OH – exchange occurs, estimation of dissolution rate from released Cl appears to be the best proxy. Dissolution rates were normalized to the final specific surface areas (ranging from 6.1 to 35.4 m 2 g −1). Dissolution rate appears to be pH-independent and therefore the far-from-equilibrium dissolution rate at room temperature is expressed as: logR(mol m –2 s –1) = –9.23 ± 0.1

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“…However, it can be partially replaced by concentrated K ions. In general, cement contains approximately 0.1 to 1 ppm stable Cs and 0.1% K. If these alkalis remain in the concrete, r-Cs will behave similar to other alkalis (Iwaida et al 2001). The majority of the alkalis in the concrete are water-soluble.…”

Section: Dissolution Behaviors Of R-cs From Contaminated Concretementioning

confidence: 99%

Field Survey of Radioactive Cesium Contamination in Concrete After the Fukushima-Daiichi Nuclear Power Station Accident

Yamada

Takeuchi

Igarashi

et al. 2019

ACT

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The Fukushima-Daiichi nuclear power station accident in East Japan in 2011 released radioactive cesium (r-Cs) into the surrounding environment. In addition to the major contamination of soil and vegetation, surrounding concrete structures have also been contaminated. Understanding the contamination characteristics is important for the decontamination or disposal of offsite and onsite concrete structures. However, r-Cs contamination of actual concrete has not been extensively investigated. In this paper, the r-Cs contamination characteristics of actual concrete are introduced on the basis of several field surveys and analysis of concrete samples taken from actual contaminated structures in the Fukushima prefecture. As no dissolution to water was detected, the surface contamination was safely removed by water-jet abrasion. However, in KCl solution, significant dissolution of r-Cs was detected. A contamination depth analysis was performed by quantitative r-Cs concentration mapping based on β-ray radiography using imaging plates. In many cases, such as roadside gutter cover plates, r-Cs was located on the surface without significant penetration into the concrete. However, in cases such as degraded concrete, deeper penetration up to several millimeters deep was observed. In cracked concrete, the r-Cs penetrated at least 10 cm, with the contamination level decreasing one order of magnitude in the first 1 cm.

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Sorption behavior of strontium onto C-S-H (calcium silicate hydrated phases)

Cited by 10 publications

References 2 publications

Binding mechanisms of radionuclides to cement

Binding mechanisms of radionuclides to cement

Dissolution kinetics of hydrated calcium aluminates (AFm-Cl) as a function of pH and at room temperature

Field Survey of Radioactive Cesium Contamination in Concrete After the Fukushima-Daiichi Nuclear Power Station Accident

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