Microscopy and microanalysis of alkali activated fly ash binder
Само за регистроване кориснике
2012
Аутори
Baščarević, ZvezdanaKomljenović, Miroslav M
Nikolic, Violeta
Džunuzović, Nataša
Petrašinović-Stojkanović, Ljiljana
Ršumović, Mihailo
Конференцијски прилог (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Large quantities of fly ash (FA) are produced worldwide by burning of pulverized coal in the thermal power plants. It is a dustlike material which usually contains significant amount of amorphous phase due to rapid cooling of the molten material. It is highly heterogeneous material, as FA particles show different chemical and phase composition. Alkali activation of FA with a concentrated alkali metal silicate or hydroxide solution transforms it to a high performance binder. Amorphous aluminosilicate phase present in FA dissolves in alkaline solution creating aluminosilicate gel as a final product of the reaction. Due to this three-dimensional highly interconnected aluminosilicate gel new binder shows excellent mechanical properties and high durability.
In this work, FA samples from Serbian power plants were treated with sodium silicate solution. Alkali activation process was performed for 24h at 95°C and followed by curing of binder samples in humid chamber for 365 days. Microstructur...e of the samples was studied by electron microscopic analysis (scanning electron microscope, SEM, coupled with energy dispersive X-ray spectrometer, EDS). SEM/EDS analysis provided useful insight into the process of dissolution of specific FA particles by alkaline solution. Alkali solution dissolves amorphous aluminosilicate phase in FA, while crystalline phases remain unaltered. Iron and calcium rich FA particles remained unreacted in the alkali activation process. Some aluminosilicate particles were also unaffected by alkaline solution due to the presence of crystalline phases or due to the lower solubility of certain amorphous phase.
Кључне речи:
fly ash / alkali activation / microstructure / scanning electron microscopeИзвор:
18 Internationale Baustofftagung, IBAUSIL, 2012, 1, 1-0490-1-0496Издавач:
- F.A. Finger-Institut fur Baustoffkunde, Bauhaus-Universitaet Weimar, Germany
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 - Baščarević, Zvezdana AU - Komljenović, Miroslav M AU - Nikolic, Violeta AU - Džunuzović, Nataša AU - Petrašinović-Stojkanović, Ljiljana AU - Ršumović, Mihailo PY - 2012 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/2932 AB - Large quantities of fly ash (FA) are produced worldwide by burning of pulverized coal in the thermal power plants. It is a dustlike material which usually contains significant amount of amorphous phase due to rapid cooling of the molten material. It is highly heterogeneous material, as FA particles show different chemical and phase composition. Alkali activation of FA with a concentrated alkali metal silicate or hydroxide solution transforms it to a high performance binder. Amorphous aluminosilicate phase present in FA dissolves in alkaline solution creating aluminosilicate gel as a final product of the reaction. Due to this three-dimensional highly interconnected aluminosilicate gel new binder shows excellent mechanical properties and high durability. In this work, FA samples from Serbian power plants were treated with sodium silicate solution. Alkali activation process was performed for 24h at 95°C and followed by curing of binder samples in humid chamber for 365 days. Microstructure of the samples was studied by electron microscopic analysis (scanning electron microscope, SEM, coupled with energy dispersive X-ray spectrometer, EDS). SEM/EDS analysis provided useful insight into the process of dissolution of specific FA particles by alkaline solution. Alkali solution dissolves amorphous aluminosilicate phase in FA, while crystalline phases remain unaltered. Iron and calcium rich FA particles remained unreacted in the alkali activation process. Some aluminosilicate particles were also unaffected by alkaline solution due to the presence of crystalline phases or due to the lower solubility of certain amorphous phase. PB - F.A. Finger-Institut fur Baustoffkunde, Bauhaus-Universitaet Weimar, Germany C3 - 18 Internationale Baustofftagung, IBAUSIL T1 - Microscopy and microanalysis of alkali activated fly ash binder EP - 1-0496 SP - 1-0490 VL - 1 UR - https://hdl.handle.net/21.15107/rcub_rimsi_2932 ER -
@conference{ author = "Baščarević, Zvezdana and Komljenović, Miroslav M and Nikolic, Violeta and Džunuzović, Nataša and Petrašinović-Stojkanović, Ljiljana and Ršumović, Mihailo", year = "2012", abstract = "Large quantities of fly ash (FA) are produced worldwide by burning of pulverized coal in the thermal power plants. It is a dustlike material which usually contains significant amount of amorphous phase due to rapid cooling of the molten material. It is highly heterogeneous material, as FA particles show different chemical and phase composition. Alkali activation of FA with a concentrated alkali metal silicate or hydroxide solution transforms it to a high performance binder. Amorphous aluminosilicate phase present in FA dissolves in alkaline solution creating aluminosilicate gel as a final product of the reaction. Due to this three-dimensional highly interconnected aluminosilicate gel new binder shows excellent mechanical properties and high durability. In this work, FA samples from Serbian power plants were treated with sodium silicate solution. Alkali activation process was performed for 24h at 95°C and followed by curing of binder samples in humid chamber for 365 days. Microstructure of the samples was studied by electron microscopic analysis (scanning electron microscope, SEM, coupled with energy dispersive X-ray spectrometer, EDS). SEM/EDS analysis provided useful insight into the process of dissolution of specific FA particles by alkaline solution. Alkali solution dissolves amorphous aluminosilicate phase in FA, while crystalline phases remain unaltered. Iron and calcium rich FA particles remained unreacted in the alkali activation process. Some aluminosilicate particles were also unaffected by alkaline solution due to the presence of crystalline phases or due to the lower solubility of certain amorphous phase.", publisher = "F.A. Finger-Institut fur Baustoffkunde, Bauhaus-Universitaet Weimar, Germany", journal = "18 Internationale Baustofftagung, IBAUSIL", title = "Microscopy and microanalysis of alkali activated fly ash binder", pages = "1-0496-1-0490", volume = "1", url = "https://hdl.handle.net/21.15107/rcub_rimsi_2932" }
Baščarević, Z., Komljenović, M. M., Nikolic, V., Džunuzović, N., Petrašinović-Stojkanović, L.,& Ršumović, M.. (2012). Microscopy and microanalysis of alkali activated fly ash binder. in 18 Internationale Baustofftagung, IBAUSIL F.A. Finger-Institut fur Baustoffkunde, Bauhaus-Universitaet Weimar, Germany., 1, 1-0490-1-0496. https://hdl.handle.net/21.15107/rcub_rimsi_2932
Baščarević Z, Komljenović MM, Nikolic V, Džunuzović N, Petrašinović-Stojkanović L, Ršumović M. Microscopy and microanalysis of alkali activated fly ash binder. in 18 Internationale Baustofftagung, IBAUSIL. 2012;1:1-0490-1-0496. https://hdl.handle.net/21.15107/rcub_rimsi_2932 .
Baščarević, Zvezdana, Komljenović, Miroslav M, Nikolic, Violeta, Džunuzović, Nataša, Petrašinović-Stojkanović, Ljiljana, Ršumović, Mihailo, "Microscopy and microanalysis of alkali activated fly ash binder" in 18 Internationale Baustofftagung, IBAUSIL, 1 (2012):1-0490-1-0496, https://hdl.handle.net/21.15107/rcub_rimsi_2932 .