Characteristics of Cast Stone cementitious waste form for immobilization of secondary wastes from vitrification process

Chung, Chul-Woo; Um, Wooyong; Valenta, Michelle M.; Sundaram, S. K.; Chun, Jaehun; Parker, Kent E.; Kimura, Marcia L.; Westsik, Joseph H.

doi:10.1016/j.jnucmat.2011.09.021

Cited by 22 publications

(17 citation statements)

References 9 publications

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“…Its reactivity is, however, increased as pH increases [ 18 , 19 ]. Because the reactivity of SL can also be increased by the presence of calcium sulfates [ 14 , 20 , 21 ], commercial SL typically contains some type of calcium sulfate [ 22 , 23 ]. Increasing SL fineness by grinding may also be performed to enhance the reactivity of SL.…”

Section: Introductionmentioning

confidence: 99%

Revisiting the Effect of Slag in Reducing Heat of Hydration in Concrete in Comparison to Other Supplementary Cementitious Materials

et al. 2018

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Blast furnace slag (SL) is an amorphous calcium aluminosilicate material that exhibits both pozzolanic and latent hydraulic activities. It has been successfully used to reduce the heat of hydration in mass concrete. However, SL currently available in the market generally experiences pre-treatment to increase its reactivity to be closer to that of portland cement. Therefore, using such pre-treated SL may not be applicable for reducing the heat of hydration in mass concrete. In this work, the adiabatic and semi-adiabatic temperature rise of concretes with 20% and 40% SL (mass replacement of cement) containing calcium sulfate were investigated. Isothermal calorimetry and thermal analysis (TGA) were used to study the hydration kinetics of cement paste at 23 and 50 °C. Results were compared with those with control cement and 20% replacements of silica fume, fly ash, and metakaolin. Results obtained from adiabatic calorimetry and isothermal calorimetry testing showed that the concrete with SL had somewhat higher maximum temperature rise and heat release compared to other materials, regardless of SL replacement levels. However, there was a delay in time to reach maximum temperature with increasing SL replacement level. At 50 °C, a significant acceleration was observed for SL, which is more likely related to the pozzolanic reaction than the hydraulic reaction. Semi-adiabatic calorimetry did not show a greater temperature rise for the SL compared to other materials; the differences in results between semi-adiabatic and adiabatic calorimetry are important and should be noted. Based on these results, it is concluded that the use of blast furnace slag should be carefully considered if used for mass concrete applications.

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Section: Introductionmentioning

confidence: 99%

Revisiting the Effect of Slag in Reducing Heat of Hydration in Concrete in Comparison to Other Supplementary Cementitious Materials

et al. 2018

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“…Glass-ceramics usually possess excellent abrasive resistance, thermal stability and chemical resistance [7,[11][12][13], and therefore, have been widely used in different industry sectors, such as metallurgy, chemical engineering, and electrical engineering. The term glassceramics generally refers to a type of inorganic engineering material, which is prepared from a hot molten mass.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of sintered glass–ceramics containing Au–Cu tailing waste

Shu

et al. 2015

Materials & Design

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“…For Na, K, and S there is no significant change in concentration across the entire final pH range observed. As previously mentioned, measured Ca and Mg concentrations significantly decrease, by close to two orders of magnitude, at pH levels greater than 10, which could be due to calcite and dolomite (or brucite) precipitation formed on the sample surfaces (Chung et al 2012). For Si, concentrations vary between 10 3 and 10 4 µg/g except at the acidic end point, pH 2.07, where an increase in concentration by two orders of magnitude is measured, likely due to large amounts of Si release as more of the LSWG dissolves.…”

Section: Resultsmentioning

confidence: 59%

“…For pH levels 12.20 and 12.62, there is a decrease of over 1 µg/g in released 99 Tc. This decrease correlates with a decrease in Ca concentration (Table 5.3), which could be due to the precipitation of calcite at pH levels greater than 10 and is capable of blocking 99 Tc release as it forms on the monolith surface (Chung et al 2012). Finally, given the starting 99 Tc concentration in the solid, 7.46 µg/g (Table 6.1 in Section 6), these results suggest that complete 99 Tc release from the solid material is not achieved within the 24-hour reaction period under all pH conditions tested by EPA Method 1313. a. ND indicates "not detected," sample concentration below quantification level for Fe (<100 µg/L).…”

Section: Resultsmentioning

confidence: 95%

Updated Liquid Secondary Waste Grout Formulation and Preliminary Waste Form Qualification

Saslow¹,

Um²,

Russell³

et al. 2017

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Rod in the Geosciences group at Pacific Northwest National Laboratory (PNNL) for their analytical and laboratory support. We would also like to thank Lenna Mahoney and Guzel Tartakovsky for calculation reviews and Jeff Serne for his technical review. We are grateful to Mark Bowden and Tamas Varga for xray diffraction data collection and analysis. We would like to acknowledge Maura Zimmerschied for editing this report. PNNL is a multi-program national laboratory operated by Battelle for the U.S.

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Characteristics of Cast Stone cementitious waste form for immobilization of secondary wastes from vitrification process

Cited by 22 publications

References 9 publications

Revisiting the Effect of Slag in Reducing Heat of Hydration in Concrete in Comparison to Other Supplementary Cementitious Materials

Revisiting the Effect of Slag in Reducing Heat of Hydration in Concrete in Comparison to Other Supplementary Cementitious Materials

Preparation and properties of sintered glass–ceramics containing Au–Cu tailing waste

Updated Liquid Secondary Waste Grout Formulation and Preliminary Waste Form Qualification

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