Thermodynamic data for the solubility of tin(IV) in aqueous cementitious environments

Lothenbach, Barbara; Ochs, Michael F.; Hager, Douglas F.

doi:10.1524/ract.2000.88.9-11.521

Cited by 15 publications

(17 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Particularly, the equilibrium constant for silica ion (K 1 ), and CSH gel (K 2 , K 3 , K 4 , and K 5 ) were directly obtained from the CEMDATA 14.01 database developed by Lothenbach et al . The determination of K 6 is based on the nonlinear fitting based on the published results in reference .…”

Section: Results and Analysismentioning

confidence: 99%

Kinetic analysis and thermodynamic simulation of alkali‐silica reaction in cementitious materials

et al. 2018

View full text Add to dashboard Cite

This work aims to study the alkali‐silica reaction (ASR) with incorporated kinetic‐thermodynamic analysis. The model reactant tests were first conducted to study the silica dissolution in the simulated pore solution under different temperatures. Then, the kinetic model for silica dissolution was further improved by considering the influence of effective surface area. The improved kinetic model was also incorporated into the GEMS thermodynamic simulation. The model analysis demonstrated the silica dissolution rate is decreased mainly caused by reduced hydroxyl activity with increased saturation degree. The dissolved silica first reacted with the portlandite phase and formed the Calcium–Silicate–Hydrate (CSH) gel. The ASR gel can only be generated under high silicate ion concentration after the consumption of portlandite.

show abstract

Section: Results and Analysismentioning

confidence: 99%

Kinetic analysis and thermodynamic simulation of alkali‐silica reaction in cementitious materials

et al. 2018

View full text Add to dashboard Cite

show abstract

“…This is because in most studies, the presence of significant amount of dissolved Ca generated from cement has not been accounted for. In the presence of Ca in highly alkaline solutions, the solubility limiting Sn phase is Ca-stannate[CaSn(OH) 6 (s)] and not a Sn oxide, 24) so the data for Ca-stannate should be included in the JNC-TDB. For comparison of Ni dataset, experimental data of Ochs et al, 22) Baston et al 21) and Mattigod et al 25) were selected.…”

Section: Applicability Of Thermodynamic Data To Cementitious Conditionsmentioning

confidence: 99%

Applicability of Thermodynamic Database of Radioactive Elements Developed for the Japanese Performance Assessment of HLW Repository

Yui¹,

Rai

Ochs³

et al. 2003

J. Nucl. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

In 1999 Japan Nuclear Cycle Development Institute (JNC) published a second progress report (also known as H12 report) on high-level radioactive waste (HLW) disposal in Japan (JNC 1999). This report helped to develop confidence in the selected HLW disposal system and to establish the implementation body in 2000 for the disposal of HLW. JNC developed an in-house thermodynamic database for radioactive elements for performance analysis of the engineered barrier system (EBS) and the geosphere for H12 report. This paper briefly presents the status of the JNC's thermodynamic database and its applicability to perform realistic analyses of the solubilities of radioactive elements, evolution of solubility-limiting solid phases, predictions of the redox state of Pu in the neutral pH range under reducing conditions, and to estimate solubilities of radioactive elements in cementitious conditions.

show abstract

“…Borate can cause retardation (Atabek et al, 1992;Demirbas and Karslioglu, 1995;Ramachandran and Lowery, 1998) and occurs because the ions react with the cement to form calcium borate phases that then adsorb onto the cement and precipitate slightly soluble layers (Bell and Coveney, 1998;Bensted et al, 1991;Csetenyi and Glasser, 1995). Zinc or tin retards early hydration (Hill and Sharp, 2005), resulting in the formation of either a calcium zincate phase (CaZn (OH) 6 .2H 2 O) (Cocke and Mollah, 1993;Hill, 1999;Ivey et al, 1990;Odler, 2004;Thomas et al, 1981) or an analogous tin phase (CaSn(OH) 6 ) (Bonhoure et al, 2003;Gao and Song, 2013;Hill, 1999;Hill and Sharp, 2003a;Lothenbach et al, 2000). Retardation by tin depends on the type and amount of salt added, suggesting that different retardation mechanisms may be occurring with different compounds (tin(II) chloride (SnCl 2 ) is reported to act only as a retarder, whereas tin(IV) chloride (SnCl 4 ) is reported to retard up to addition levels of $1%, after which it acts as an accelerator; this could be due to the heat generated during early hydration) (Hill and Sharp, 2003b).…”

Section: Introductionmentioning

confidence: 99%

Deep borehole disposal grouts – are inorganic retarders appropriate?

Collier

Pawar

Milestone

et al. 2018

Advances in Cement Research

View full text Add to dashboard Cite

Cementitious grouts are being developed for use as sealing and support matrices (SSMs) in deep borehole disposal (DBD) of high-level radioactive waste. These SSMs will seal the waste containers within a disposal zone and provide physical support during package placement. The ambient temperature and pressure will be 80-130°C and 30-50 MPa, respectively, depending on depth and local geological conditions. This will accelerate grout thickening, so retardation is required to facilitate slurry placement. Certain inorganic materials suppress cement hydration and retard thickening under ambient conditions. However, their retardation characteristics are unknown at elevated temperature and pressure. Inorganic compounds of borate, phosphate, tin and zinc were investigated as retarders, and a summary of the work is provided in this paper. All retarders were found to delay thickening, with only borate providing sufficient retardation, but only at 90°C (0·75% addition); retardation was nearly sufficient at 120°C (1% addition). The effect of all the retarders on wet paste properties was not consistent but, generally, plastic viscosity and yield stress peaked at specific addition levels. None of the retarders influenced phase composition, and each retarding ion was evenly distributed throughout the hardened microstructure. The results of this study led to the conclusion that no inorganic retarder is appropriate for use across the whole DBD temperature range.

show abstract

Thermodynamic data for the solubility of tin(IV) in aqueous cementitious environments

Abstract: The solubility of Sn(IV) in cementitious systems is directly related to the presence of dissolved Ca. In the presence of typical Ca concentrations, solid Ca[Sn(OH)A constant of 10

Cited by 15 publications

References 5 publications

Kinetic analysis and thermodynamic simulation of alkali‐silica reaction in cementitious materials

Kinetic analysis and thermodynamic simulation of alkali‐silica reaction in cementitious materials

Applicability of Thermodynamic Database of Radioactive Elements Developed for the Japanese Performance Assessment of HLW Repository

Deep borehole disposal grouts – are inorganic retarders appropriate?

Contact Info

Product

Resources

About