VARIABLE FACTORS CONTROLLING AMORPHOUS-ZEOLITE PHASE TRANSFORMATION IN METAKAOLIN BASED GEOPOLYMER
| Autor: | Pimraksa Kedsarin, Juengsuwattananon Kannikar |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
lcsh:TN1-997
Geopolymer binder Zeolite Materials science Amorphous gel Metals and Alloys Aluminosilicates Faujasite engineering.material Alkali metal Geopolymer chemistry.chemical_compound chemistry Chemical engineering Sodium hydroxide Aluminosilicate engineering Sodalite Microstructure lcsh:Mining engineering. Metallurgy Metakaolin |
| Zdroj: | Acta Metallurgica Slovaca, Vol 23, Iss 4 (2017) |
| ISSN: | 1338-1156 1335-1532 |
| DOI: | 10.12776/ams.v23i4.1001 |
| Popis: | Metakaolin based geopolymer binder was synthesized using variable factors such as Na 2 O/SiO 2 , Na 2 O/Al 2 O 3 and H 2 O/Na 2 O molar ratios as well as curing time. Metakaolin was used as an alumino-silicate source incorporating with strong alkali activators; sodium hydroxide solution to undergo polycondenation and hence a formation of hardened geopolymeric binder. This work was aimed to investigate the effect of Na 2 O/SiO 2 , Na 2 O/Al 2 O 3 and H 2 O/Na 2 O ratios, as well as curing time on phase transformation. The chemical composition, phase development and microstructure of reaction products were examined by X-ray fluorescence, X-ray diffraction analysis and scanning electron microscopy with respect to their final compressive strength. Increasing the molar ratios of Na 2 O/Al 2 O 3 and H 2 O/Na 2 O tended to favour the transformation of amorphous gel to various types of crystalline zeolite. Sodalite (pseudo-phase zeolite) and zeolite belonging to the Faujasite group, as well as zeolite X and A were identified in these mixtures. Based on this study, systems that favoured the formation of zeolitic products tended to possess lower strengths. |
| Databáze: | OpenAIRE |
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