Performance of Geopolymer Concrete Exposed to Freezing and Thawing Cycles

Abstract

In this study, the effect of rapid freezing and thawing (ASTM C666– procedure A) on three different types of Geopolymer concrete studiedusing three types of pozzolanic material: fly ash, metakaolin and groundgranulated blast furnace slag (GGBFS). The Geopolymer concrete wasprepared using 400 kg of the pozzolanic material with alkaline liquidprepared at 8 molar concentration with normal fine and coarse aggregates.The ratio of alkaline to fly ash and GGBFS was 1.5: 1 and for metakaolinwas 2: 1 for workability and compressive strength requirements. Specimens(100 × 100 × 400) mm were exposed to 100, 200 and 300 cycles of freezingand thawing. The decrease in measured compressive strength was (23, 43,and 26%) for Fly ash, metakaolin and GGBFS respectively. The investigatedtypes of concrete showed good resistance to freezing and thawing. Thedurability factor of these types was (77%, 68%, and 81%) for fly ash,metakaolin, and GGBFS respectively.Keywords- Freezing and thawing,