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Evaluation of geopolymer concretes at elevated temperature
Geopolymers are an emerging class of cementitious binders which possess a potential for high temperature resistance that could possibly be utilized in applications such as nozzles, aspirators and refractory linings. This study reports on the results of an investigation into the performance of fly ash based geopolymer binder in high temperature environments. Geopolymer concrete (GPC) was prepared using eleven types of fly ashes obtained from four different countries. High content alumina and silica sand were used in the mix for preparing GPC. GPC was subjected to thermal shock tests using ASTM C 1100-88. The GPC samples prepared with tabular alumina were kept in at 1093 °C and immediately quenched in water. GPC specimens prepared with certain fly ashes exhibited signs of expansion along with cracking and spalling, while GPC prepared with specific Class "F" fly ash showed superior resistance to thermal shock. Microstructural analysis revealed that the resistance of GPC at elevated temperatures was dependent on the type of fly ash used, particle size distribution of fly ash, formation of zeolitic phases such as sodalite, analcime and nepheline and the overall pore structure of geopolymer concrete. The work indicates that the chemical composition and particle size distribution of the fly ash, type of fly ash (Class C & F) and the geopolymerization process plays a vital role in determining the suitability of geopolymer concrete for high temperature applications.
Evaluation of geopolymer concretes at elevated temperature
Geopolymers are an emerging class of cementitious binders which possess a potential for high temperature resistance that could possibly be utilized in applications such as nozzles, aspirators and refractory linings. This study reports on the results of an investigation into the performance of fly ash based geopolymer binder in high temperature environments. Geopolymer concrete (GPC) was prepared using eleven types of fly ashes obtained from four different countries. High content alumina and silica sand were used in the mix for preparing GPC. GPC was subjected to thermal shock tests using ASTM C 1100-88. The GPC samples prepared with tabular alumina were kept in at 1093 °C and immediately quenched in water. GPC specimens prepared with certain fly ashes exhibited signs of expansion along with cracking and spalling, while GPC prepared with specific Class "F" fly ash showed superior resistance to thermal shock. Microstructural analysis revealed that the resistance of GPC at elevated temperatures was dependent on the type of fly ash used, particle size distribution of fly ash, formation of zeolitic phases such as sodalite, analcime and nepheline and the overall pore structure of geopolymer concrete. The work indicates that the chemical composition and particle size distribution of the fly ash, type of fly ash (Class C & F) and the geopolymerization process plays a vital role in determining the suitability of geopolymer concrete for high temperature applications.
Evaluation of geopolymer concretes at elevated temperature
Kupwade-Patil, Kunal (author) / Badar, Mohammad Sufian (author) / Dhakal, Milap (author) / Allouche, Erez N. (author)
2014
17 Seiten, Bilder, Tabellen, 21 Quellen
Conference paper
English
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