Leaching resistance of alkali-activated binder contaminated with cesium
Apstrakt
Leaching is a phenomenon of fundamental interest in low-level radioactive waste disposal, and the
measurement of the leaching resistance of different wasteforms is very important for proper waste
management. In general, alkali-activated binders (AABs) can be considered as a sustainable solution
for safe immobilization of hazardous wastes containing different toxic or radioactive elements.
In this paper, the leaching resistance of AAB based on blast furnace slag (BFS), contaminated with 2%
cesium (i.e., solidified simulated low-level radioactive waste), was investigated according to the
ANSI/ANS-16.1-2003 standard procedure.
Based on the leaching results obtained for different elements, in particular for Cs, Si, Al, Ca, Na, and
K, it was concluded that the short (up to 5 days) semi-dynamic process of leaching from AAB can be
divided into two distinct stages: a) fast leaching of non-bound or loosely bound ions during the initial 24
hours, which occurred mostly between the surfa...ce of AAB and the leachant, and b) slower leaching in
the later stages of the experiment, which was controlled by diffusion of ions through AAB matrix.
By calculating the diffusion coefficient (D) and the leachability index (L) of cesium, it was also
concluded that AAB based on blast furnace slag, synthesized under the given experimental conditions,
can be considered as a potentially efficient matrix for immobilizing up to 2% cesium in hazardous
wastes.
Ključne reči:
Immobilization / Cesium / Alkali-activated binders / Blast furnace slagIzvor:
15th International Congress on the Chemistry of Cement, 2019, 2622/801-Izdavač:
- Research Institute of Binding Materials Prague Ltd. Na Cikánce 2 153 00 Prague 5 – Radotín Czech Republic
Finansiranje / projekti:
- Geopolimeri - Razvoj tehnologije za konverziju industrijskog otpada u funkcionalne materijale (RS-MESTD-Technological Development (TD or TR)-34026)
- NATO Science for Peace and Security (SPS) Programme, (G5402)
Institucija/grupa
Institut za multidisciplinarna istraživanjaTY - CONF AU - Tanasijević, Gordana AU - Ivanović, Tijana AU - Provis, John L. AU - Komljenovic, Miroslav PY - 2019 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/2563 AB - Leaching is a phenomenon of fundamental interest in low-level radioactive waste disposal, and the measurement of the leaching resistance of different wasteforms is very important for proper waste management. In general, alkali-activated binders (AABs) can be considered as a sustainable solution for safe immobilization of hazardous wastes containing different toxic or radioactive elements. In this paper, the leaching resistance of AAB based on blast furnace slag (BFS), contaminated with 2% cesium (i.e., solidified simulated low-level radioactive waste), was investigated according to the ANSI/ANS-16.1-2003 standard procedure. Based on the leaching results obtained for different elements, in particular for Cs, Si, Al, Ca, Na, and K, it was concluded that the short (up to 5 days) semi-dynamic process of leaching from AAB can be divided into two distinct stages: a) fast leaching of non-bound or loosely bound ions during the initial 24 hours, which occurred mostly between the surface of AAB and the leachant, and b) slower leaching in the later stages of the experiment, which was controlled by diffusion of ions through AAB matrix. By calculating the diffusion coefficient (D) and the leachability index (L) of cesium, it was also concluded that AAB based on blast furnace slag, synthesized under the given experimental conditions, can be considered as a potentially efficient matrix for immobilizing up to 2% cesium in hazardous wastes. PB - Research Institute of Binding Materials Prague Ltd. Na Cikánce 2 153 00 Prague 5 – Radotín Czech Republic C3 - 15th International Congress on the Chemistry of Cement T1 - Leaching resistance of alkali-activated binder contaminated with cesium SP - 2622/801 UR - https://hdl.handle.net/21.15107/rcub_rimsi_2563 ER -
@conference{ author = "Tanasijević, Gordana and Ivanović, Tijana and Provis, John L. and Komljenovic, Miroslav", year = "2019", abstract = "Leaching is a phenomenon of fundamental interest in low-level radioactive waste disposal, and the measurement of the leaching resistance of different wasteforms is very important for proper waste management. In general, alkali-activated binders (AABs) can be considered as a sustainable solution for safe immobilization of hazardous wastes containing different toxic or radioactive elements. In this paper, the leaching resistance of AAB based on blast furnace slag (BFS), contaminated with 2% cesium (i.e., solidified simulated low-level radioactive waste), was investigated according to the ANSI/ANS-16.1-2003 standard procedure. Based on the leaching results obtained for different elements, in particular for Cs, Si, Al, Ca, Na, and K, it was concluded that the short (up to 5 days) semi-dynamic process of leaching from AAB can be divided into two distinct stages: a) fast leaching of non-bound or loosely bound ions during the initial 24 hours, which occurred mostly between the surface of AAB and the leachant, and b) slower leaching in the later stages of the experiment, which was controlled by diffusion of ions through AAB matrix. By calculating the diffusion coefficient (D) and the leachability index (L) of cesium, it was also concluded that AAB based on blast furnace slag, synthesized under the given experimental conditions, can be considered as a potentially efficient matrix for immobilizing up to 2% cesium in hazardous wastes.", publisher = "Research Institute of Binding Materials Prague Ltd. Na Cikánce 2 153 00 Prague 5 – Radotín Czech Republic", journal = "15th International Congress on the Chemistry of Cement", title = "Leaching resistance of alkali-activated binder contaminated with cesium", pages = "2622/801", url = "https://hdl.handle.net/21.15107/rcub_rimsi_2563" }
Tanasijević, G., Ivanović, T., Provis, J. L.,& Komljenovic, M.. (2019). Leaching resistance of alkali-activated binder contaminated with cesium. in 15th International Congress on the Chemistry of Cement Research Institute of Binding Materials Prague Ltd. Na Cikánce 2 153 00 Prague 5 – Radotín Czech Republic., 2622/801. https://hdl.handle.net/21.15107/rcub_rimsi_2563
Tanasijević G, Ivanović T, Provis JL, Komljenovic M. Leaching resistance of alkali-activated binder contaminated with cesium. in 15th International Congress on the Chemistry of Cement. 2019;:2622/801. https://hdl.handle.net/21.15107/rcub_rimsi_2563 .
Tanasijević, Gordana, Ivanović, Tijana, Provis, John L., Komljenovic, Miroslav, "Leaching resistance of alkali-activated binder contaminated with cesium" in 15th International Congress on the Chemistry of Cement (2019):2622/801, https://hdl.handle.net/21.15107/rcub_rimsi_2563 .