Characterization of red mud/metakaolin-based geopolymers as modified by Ca(OH)2
Аутори
Bošković, Ivana V.Vukčević, Mira
Nenadović, Snežana S.
Mirković, Miljana M.
Stojmenović, Marija
Pavlović, Vladimir B.
Kljajević, Ljiljana M.
Чланак у часопису (Објављена верзија)
,
© Institute of Metals and Technology, Ljubljana, Slovenia
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Geopolymers are an emerging class of materials that offer an alternative to the Portland cement as the binder of structural concrete. One of the advantages is that the primary source of their production is waste alumosilicate materials from different industries. One of the key issues in geopolymer synthesis is the low level of mechanical properties due to porosity as well as the high activity of conductivity carriers. It can often lead to limited application possibilities, so the objective is to obtain an enhanced strength as well as decreased cracking tendency through microstructure modification. The introduction of Ca(OH)2, under certain pH conditions could lead to the filling-the-pores process and improving the mechanical properties. The aim was to understand the role that calcium plays in the geopolymer synthesis, and to define which reaction prevails under the synthesis conditions: formation of geopolymer gel or calcium silicate hydrate that contains aluminum substitution (CASH). ...The synthesis was performed with different raw materials (with or without red mud) and different alkalinity conditions. Ca(OH)2 was the obligatory supplement to both of the mixtures. Different techniques were performed for the testing of reaction products, as well as to define the microstructural changes as the generator of improved mechanical properties and changed electrical conductivity. The characteristics of the geopolymer's macrostructure were defined by means of an SEM analysis. Compressive strength and electrical conductivity are among the investigated product's properties. X-ray diffraction (XRD) and Fourier transform infra-red spectroscopy (FTIR) were used for the identification of various crystalline phases and an amorphous phase. ©, Institute of Metals and Technology, Ljubljana, Slovenia.
Кључне речи:
geopolymers / compressive strength / calcium hydroxide / electrical conductivityИзвор:
Materiali in tehnologije, 2019, 53, 3, 341-348
DOI: 10.17222/mit.2018.130
ISSN: 1580-2949; 1580-3414
WoS: 000470994000007
Scopus: 2-s2.0-85067239580
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Институција/група
VinčaTY - JOUR AU - Bošković, Ivana V. AU - Vukčević, Mira AU - Nenadović, Snežana S. AU - Mirković, Miljana M. AU - Stojmenović, Marija AU - Pavlović, Vladimir B. AU - Kljajević, Ljiljana M. PY - 2019 UR - https://vinar.vin.bg.ac.rs/handle/123456789/8351 AB - Geopolymers are an emerging class of materials that offer an alternative to the Portland cement as the binder of structural concrete. One of the advantages is that the primary source of their production is waste alumosilicate materials from different industries. One of the key issues in geopolymer synthesis is the low level of mechanical properties due to porosity as well as the high activity of conductivity carriers. It can often lead to limited application possibilities, so the objective is to obtain an enhanced strength as well as decreased cracking tendency through microstructure modification. The introduction of Ca(OH)2, under certain pH conditions could lead to the filling-the-pores process and improving the mechanical properties. The aim was to understand the role that calcium plays in the geopolymer synthesis, and to define which reaction prevails under the synthesis conditions: formation of geopolymer gel or calcium silicate hydrate that contains aluminum substitution (CASH). The synthesis was performed with different raw materials (with or without red mud) and different alkalinity conditions. Ca(OH)2 was the obligatory supplement to both of the mixtures. Different techniques were performed for the testing of reaction products, as well as to define the microstructural changes as the generator of improved mechanical properties and changed electrical conductivity. The characteristics of the geopolymer's macrostructure were defined by means of an SEM analysis. Compressive strength and electrical conductivity are among the investigated product's properties. X-ray diffraction (XRD) and Fourier transform infra-red spectroscopy (FTIR) were used for the identification of various crystalline phases and an amorphous phase. ©, Institute of Metals and Technology, Ljubljana, Slovenia. T2 - Materiali in tehnologije T1 - Characterization of red mud/metakaolin-based geopolymers as modified by Ca(OH)2 VL - 53 IS - 3 SP - 341 EP - 348 DO - 10.17222/mit.2018.130 ER -
@article{ author = "Bošković, Ivana V. and Vukčević, Mira and Nenadović, Snežana S. and Mirković, Miljana M. and Stojmenović, Marija and Pavlović, Vladimir B. and Kljajević, Ljiljana M.", year = "2019", abstract = "Geopolymers are an emerging class of materials that offer an alternative to the Portland cement as the binder of structural concrete. One of the advantages is that the primary source of their production is waste alumosilicate materials from different industries. One of the key issues in geopolymer synthesis is the low level of mechanical properties due to porosity as well as the high activity of conductivity carriers. It can often lead to limited application possibilities, so the objective is to obtain an enhanced strength as well as decreased cracking tendency through microstructure modification. The introduction of Ca(OH)2, under certain pH conditions could lead to the filling-the-pores process and improving the mechanical properties. The aim was to understand the role that calcium plays in the geopolymer synthesis, and to define which reaction prevails under the synthesis conditions: formation of geopolymer gel or calcium silicate hydrate that contains aluminum substitution (CASH). The synthesis was performed with different raw materials (with or without red mud) and different alkalinity conditions. Ca(OH)2 was the obligatory supplement to both of the mixtures. Different techniques were performed for the testing of reaction products, as well as to define the microstructural changes as the generator of improved mechanical properties and changed electrical conductivity. The characteristics of the geopolymer's macrostructure were defined by means of an SEM analysis. Compressive strength and electrical conductivity are among the investigated product's properties. X-ray diffraction (XRD) and Fourier transform infra-red spectroscopy (FTIR) were used for the identification of various crystalline phases and an amorphous phase. ©, Institute of Metals and Technology, Ljubljana, Slovenia.", journal = "Materiali in tehnologije", title = "Characterization of red mud/metakaolin-based geopolymers as modified by Ca(OH)2", volume = "53", number = "3", pages = "341-348", doi = "10.17222/mit.2018.130" }
Bošković, I. V., Vukčević, M., Nenadović, S. S., Mirković, M. M., Stojmenović, M., Pavlović, V. B.,& Kljajević, L. M.. (2019). Characterization of red mud/metakaolin-based geopolymers as modified by Ca(OH)2. in Materiali in tehnologije, 53(3), 341-348. https://doi.org/10.17222/mit.2018.130
Bošković IV, Vukčević M, Nenadović SS, Mirković MM, Stojmenović M, Pavlović VB, Kljajević LM. Characterization of red mud/metakaolin-based geopolymers as modified by Ca(OH)2. in Materiali in tehnologije. 2019;53(3):341-348. doi:10.17222/mit.2018.130 .
Bošković, Ivana V., Vukčević, Mira, Nenadović, Snežana S., Mirković, Miljana M., Stojmenović, Marija, Pavlović, Vladimir B., Kljajević, Ljiljana M., "Characterization of red mud/metakaolin-based geopolymers as modified by Ca(OH)2" in Materiali in tehnologije, 53, no. 3 (2019):341-348, https://doi.org/10.17222/mit.2018.130 . .