Mechanical and Microstructural Changes of Alkali-Activated Binder Due to the Leaching Process
Само за регистроване кориснике
2011
Аутори
Komljenović, Miroslav MBaščarević, Zvezdana
Nikolic, Violeta
Džunuzović, Nataša
Ršumović, Mihailo
Rosić, Aleksandra
Конференцијски прилог (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
This paper investigates the resistance of alkali-activated binder to leaching. This type of binder was obtained by alkali-activation of blast-furnace slag. The slag was activated by aqueous solution of sodium silicate. The resistance of alkali-activated slag to leaching was studied on mortar prisms, with the use of an accelerated test with concentrated solution (50%) of ammonium nitrate at 20 ºC. Strength of mortar was determined after 30, 60, and 90 days of exposure to ammonium nitrate solution. Portland-slag cement (CEM II/А-Ѕ 42.5R) was used as the reference material.
After 30 days of exposure to ammonium nitrate solution the strength of alkali-activated slag, with respect to control samples, was slightly reduced (about 5%). At the same time the reference Portland-slag cement sample showed drastic strength reduction (over 50%). After 90 days of exposure the reduction of Portland-slag cement strength was over 80%. In the case of the reference cement sample, significant loss of portl...andite, i.e. calcium, was established by X-ray and scanning electron microscopy (SEM/EDS) analysis. The loss of calcium lead to a progressive decalcification of calcium–silicate–hydrates (C–S–H), drastic reduction of strength and destruction of the samples studied. In comparison with the reference cement sample decalcification of alkali-activated slag was a very slow process, whereby a minor change in the structure was observed.
Based on the results of investigation it can be concluded that alkali-activated slag has showed high resistance to leaching
Кључне речи:
alkali-activated slag / leaching / strengthИзвор:
XIII International Congress on the Chemistry of Cement ICCC, 2011, pdf doc 272-1-7-Издавач:
- Ministerio de Ciencia e Innovacion, Spain & Instituto Eduardo Torroja
Финансирање / пројекти:
- Геополимери - Развој технологије за конверзију индустријског отпада у функционалне материјале (RS-MESTD-Technological Development (TD or TR)-34026)
Институција/група
Institut za multidisciplinarna istraživanjaTY - CONF AU - Komljenović, Miroslav M AU - Baščarević, Zvezdana AU - Nikolic, Violeta AU - Džunuzović, Nataša AU - Ršumović, Mihailo AU - Rosić, Aleksandra PY - 2011 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/2923 AB - This paper investigates the resistance of alkali-activated binder to leaching. This type of binder was obtained by alkali-activation of blast-furnace slag. The slag was activated by aqueous solution of sodium silicate. The resistance of alkali-activated slag to leaching was studied on mortar prisms, with the use of an accelerated test with concentrated solution (50%) of ammonium nitrate at 20 ºC. Strength of mortar was determined after 30, 60, and 90 days of exposure to ammonium nitrate solution. Portland-slag cement (CEM II/А-Ѕ 42.5R) was used as the reference material. After 30 days of exposure to ammonium nitrate solution the strength of alkali-activated slag, with respect to control samples, was slightly reduced (about 5%). At the same time the reference Portland-slag cement sample showed drastic strength reduction (over 50%). After 90 days of exposure the reduction of Portland-slag cement strength was over 80%. In the case of the reference cement sample, significant loss of portlandite, i.e. calcium, was established by X-ray and scanning electron microscopy (SEM/EDS) analysis. The loss of calcium lead to a progressive decalcification of calcium–silicate–hydrates (C–S–H), drastic reduction of strength and destruction of the samples studied. In comparison with the reference cement sample decalcification of alkali-activated slag was a very slow process, whereby a minor change in the structure was observed. Based on the results of investigation it can be concluded that alkali-activated slag has showed high resistance to leaching PB - Ministerio de Ciencia e Innovacion, Spain & Instituto Eduardo Torroja C3 - XIII International Congress on the Chemistry of Cement ICCC T1 - Mechanical and Microstructural Changes of Alkali-Activated Binder Due to the Leaching Process SP - pdf doc 272-1-7 UR - https://hdl.handle.net/21.15107/rcub_rimsi_2923 ER -
@conference{ author = "Komljenović, Miroslav M and Baščarević, Zvezdana and Nikolic, Violeta and Džunuzović, Nataša and Ršumović, Mihailo and Rosić, Aleksandra", year = "2011", abstract = "This paper investigates the resistance of alkali-activated binder to leaching. This type of binder was obtained by alkali-activation of blast-furnace slag. The slag was activated by aqueous solution of sodium silicate. The resistance of alkali-activated slag to leaching was studied on mortar prisms, with the use of an accelerated test with concentrated solution (50%) of ammonium nitrate at 20 ºC. Strength of mortar was determined after 30, 60, and 90 days of exposure to ammonium nitrate solution. Portland-slag cement (CEM II/А-Ѕ 42.5R) was used as the reference material. After 30 days of exposure to ammonium nitrate solution the strength of alkali-activated slag, with respect to control samples, was slightly reduced (about 5%). At the same time the reference Portland-slag cement sample showed drastic strength reduction (over 50%). After 90 days of exposure the reduction of Portland-slag cement strength was over 80%. In the case of the reference cement sample, significant loss of portlandite, i.e. calcium, was established by X-ray and scanning electron microscopy (SEM/EDS) analysis. The loss of calcium lead to a progressive decalcification of calcium–silicate–hydrates (C–S–H), drastic reduction of strength and destruction of the samples studied. In comparison with the reference cement sample decalcification of alkali-activated slag was a very slow process, whereby a minor change in the structure was observed. Based on the results of investigation it can be concluded that alkali-activated slag has showed high resistance to leaching", publisher = "Ministerio de Ciencia e Innovacion, Spain & Instituto Eduardo Torroja", journal = "XIII International Congress on the Chemistry of Cement ICCC", title = "Mechanical and Microstructural Changes of Alkali-Activated Binder Due to the Leaching Process", pages = "pdf doc 272-1-7", url = "https://hdl.handle.net/21.15107/rcub_rimsi_2923" }
Komljenović, M. M., Baščarević, Z., Nikolic, V., Džunuzović, N., Ršumović, M.,& Rosić, A.. (2011). Mechanical and Microstructural Changes of Alkali-Activated Binder Due to the Leaching Process. in XIII International Congress on the Chemistry of Cement ICCC Ministerio de Ciencia e Innovacion, Spain & Instituto Eduardo Torroja., pdf doc 272-1-7. https://hdl.handle.net/21.15107/rcub_rimsi_2923
Komljenović MM, Baščarević Z, Nikolic V, Džunuzović N, Ršumović M, Rosić A. Mechanical and Microstructural Changes of Alkali-Activated Binder Due to the Leaching Process. in XIII International Congress on the Chemistry of Cement ICCC. 2011;:pdf doc 272-1-7. https://hdl.handle.net/21.15107/rcub_rimsi_2923 .
Komljenović, Miroslav M, Baščarević, Zvezdana, Nikolic, Violeta, Džunuzović, Nataša, Ršumović, Mihailo, Rosić, Aleksandra, "Mechanical and Microstructural Changes of Alkali-Activated Binder Due to the Leaching Process" in XIII International Congress on the Chemistry of Cement ICCC (2011):pdf doc 272-1-7, https://hdl.handle.net/21.15107/rcub_rimsi_2923 .