Influence of Alkaline-activator Content on the Compressive Strength of Aluminosilicate-based Geopolymer

알루미노 실리케이트계 지오폴리머의 압축강도에 미치는 알카리 활성화제의 영향

  • Received : 2009.11.17
  • Accepted : 2010.04.20
  • Published : 2010.05.31


Portland cement has been restricted in applications to ecological area because of its environmental harmfulness and the $CO_2$ emission during a production process. Geopolymer materials attract some attention as an inorganic binder due to their superior mechanical and eco-friendly properties. In this study, geopolymer-based cement was prepared by using aluminosilicate minerals (flyash, meta-kaolin) with alkaline-activators and its compressive strength with concentration of alkaline-activators was investigated. Aluminosilicate-based geopolymers were obtained by mixing aluminosilicate minerals, alkaline solution (NaOH or KOH with different concentration) and water-glass under the vigorous stirring for 20 min. Compressive strength after curing at $30^{\circ}C$ for 3 days increased with the concentration of alkaline-activator due to the enhanced polymerization of the aluminosilicate materials and dense microstructure. Aluminosilicate-based geopolymer cement using KOH as an alkaline-activator showed high compressive strength compared with NaOH activator. In addition, geopolymer cement using fly-ash as a raw material showed higher compressive strength than that of meta-kaolin.


Geopolymer cement;Aluminasilicate;Fly-ash;Meta-kaolin;Alkaline-activator


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