Comparison of two alkali-activated systems: mechanically activated fly ash and fly ash-blast furnace slag blends
Apstrakt
Poor reactivity of fly ash (FA) in alkali activation process can be improved either by mechanical activation of fly ash or by blending fly ash with more reactive material, such as blast furnace slag (BFS). Both options were explored in this paper and comparison was performed. Mechanical activation of fly ash was conducted in a planetary ball mill, while blends of fly ash and blast furnace slag were prepared with different ratios (FA/(FA+ BFS) = 1; 0.75; 0.50; 0.25; 0). Alkali activation was carried out at 95 degrees C by use of sodium silicate solution as an activator. In both cases significant increase of geopolymer strength was observed in respect to the geopolymer based on the initial fly ash. Optimal geopolymer strength was correlated with the chemical composition of the binding gel. Empirical values of optimal gel composition could serve as a basis for tailoring properties of alkali-activated binders based on different precursors. Both alkali-activated systems represent promissing... routes for geopolymer technology development.
Ključne reči:
microstructure / geopolymers / fly ash / compressive strength / blast furnace slag / alkali activationIzvor:
7th Scientific-Technical Conference on Material Problems in Civil Engineering (Matbud'2015), 2015, 108, 231-238Izdavač:
- Elsevier Science Bv, Amsterdam
DOI: 10.1016/j.proeng.2015.06.142
ISBN: 9781510809666
WoS: 000364544000029
Scopus: 2-s2.0-84939625824
Institucija/grupa
Institut za multidisciplinarna istraživanjaTY - CONF AU - Džunuzović, Nataša AU - Komljenović, Miroslav M AU - Baščarević, Zvezdana AU - Nikolić, Violeta PY - 2015 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/901 AB - Poor reactivity of fly ash (FA) in alkali activation process can be improved either by mechanical activation of fly ash or by blending fly ash with more reactive material, such as blast furnace slag (BFS). Both options were explored in this paper and comparison was performed. Mechanical activation of fly ash was conducted in a planetary ball mill, while blends of fly ash and blast furnace slag were prepared with different ratios (FA/(FA+ BFS) = 1; 0.75; 0.50; 0.25; 0). Alkali activation was carried out at 95 degrees C by use of sodium silicate solution as an activator. In both cases significant increase of geopolymer strength was observed in respect to the geopolymer based on the initial fly ash. Optimal geopolymer strength was correlated with the chemical composition of the binding gel. Empirical values of optimal gel composition could serve as a basis for tailoring properties of alkali-activated binders based on different precursors. Both alkali-activated systems represent promissing routes for geopolymer technology development. PB - Elsevier Science Bv, Amsterdam C3 - 7th Scientific-Technical Conference on Material Problems in Civil Engineering (Matbud'2015) T1 - Comparison of two alkali-activated systems: mechanically activated fly ash and fly ash-blast furnace slag blends EP - 238 SP - 231 VL - 108 DO - 10.1016/j.proeng.2015.06.142 ER -
@conference{ author = "Džunuzović, Nataša and Komljenović, Miroslav M and Baščarević, Zvezdana and Nikolić, Violeta", year = "2015", abstract = "Poor reactivity of fly ash (FA) in alkali activation process can be improved either by mechanical activation of fly ash or by blending fly ash with more reactive material, such as blast furnace slag (BFS). Both options were explored in this paper and comparison was performed. Mechanical activation of fly ash was conducted in a planetary ball mill, while blends of fly ash and blast furnace slag were prepared with different ratios (FA/(FA+ BFS) = 1; 0.75; 0.50; 0.25; 0). Alkali activation was carried out at 95 degrees C by use of sodium silicate solution as an activator. In both cases significant increase of geopolymer strength was observed in respect to the geopolymer based on the initial fly ash. Optimal geopolymer strength was correlated with the chemical composition of the binding gel. Empirical values of optimal gel composition could serve as a basis for tailoring properties of alkali-activated binders based on different precursors. Both alkali-activated systems represent promissing routes for geopolymer technology development.", publisher = "Elsevier Science Bv, Amsterdam", journal = "7th Scientific-Technical Conference on Material Problems in Civil Engineering (Matbud'2015)", title = "Comparison of two alkali-activated systems: mechanically activated fly ash and fly ash-blast furnace slag blends", pages = "238-231", volume = "108", doi = "10.1016/j.proeng.2015.06.142" }
Džunuzović, N., Komljenović, M. M., Baščarević, Z.,& Nikolić, V.. (2015). Comparison of two alkali-activated systems: mechanically activated fly ash and fly ash-blast furnace slag blends. in 7th Scientific-Technical Conference on Material Problems in Civil Engineering (Matbud'2015) Elsevier Science Bv, Amsterdam., 108, 231-238. https://doi.org/10.1016/j.proeng.2015.06.142
Džunuzović N, Komljenović MM, Baščarević Z, Nikolić V. Comparison of two alkali-activated systems: mechanically activated fly ash and fly ash-blast furnace slag blends. in 7th Scientific-Technical Conference on Material Problems in Civil Engineering (Matbud'2015). 2015;108:231-238. doi:10.1016/j.proeng.2015.06.142 .
Džunuzović, Nataša, Komljenović, Miroslav M, Baščarević, Zvezdana, Nikolić, Violeta, "Comparison of two alkali-activated systems: mechanically activated fly ash and fly ash-blast furnace slag blends" in 7th Scientific-Technical Conference on Material Problems in Civil Engineering (Matbud'2015), 108 (2015):231-238, https://doi.org/10.1016/j.proeng.2015.06.142 . .