Proceedings of the Korean Institute of Building Construction Conference (한국건축시공학회:학술대회논문집)

The Korean Institute of Building Construction (한국건축시공학회)
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Role of class-C fly Ash in the Development of Strength & Microstructure of Fly Ash-GGBS Geopolymer

  • Sasui, Sasui (Department of Architectural Engineering, Chungnam National University) ;
  • Kim, Gyu Yong (Department of Architectural Engineering, Chungnam National University) ;
  • Lee, Sang Kyu (Department of Architectural Engineering, Chungnam National University) ;
  • Son, Min jae (Department of Architectural Engineering, Chungnam National University) ;
  • Hwang, Eui Chul (Department of Architectural Engineering, Chungnam National University) ;
  • Nam, Jeong Soo (Department of Architectural Engineering, Chungnam National University)
  • Published : 2020.06.12
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Abstract

The class-C fly ash (FA) and ground granulated blast-furnace slag (GGBS) based geopolymer activated in NaOH (4M) was studied regarding compressive strength, porosity, microstructure and formation of crystalline phases. The class-C FA and GGBS blends resulted in reduced strength and increased porosity of the matrix with the increase in FA content. The unreactivity of calcium in blends was observed with increasing FA content leading to strength loss. it is evident from XRD patterns that calcium in FA did not contribute in forming CSH bond, but formation of crystalline calcite was observed. Furthermore, XRD analyses revealed that reduction in FA leads to the reduction in crystallinity and SEM micrographs showed the unreactive FA particles which hinder the formation of denser matrix.

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