Evaluation of the effect of silica fume on amorphous fly ash geopolymers exposed to elevated temperature
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Date
2021-01Author
Li, Ong Huey
Yun-Ming, Liew
Cheng-Yong, Heah
Ridho, Bayuaji
Mohd Mustafa Al Bakri, Abdullah
Loong, Foo Kai
Jin, Tan Soo
Teng, Ng Hui
Nabiałek, Marcin
Jeż, Bartłomiej
Yong Sing, Ng
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The properties of amorphous geopolymer with silica fume addition after heat treatment was rarely reported in the geopolymer field. Geopolymer was prepared by mixing fly ash and alkali activator. The silica fume was added in 2% and 4% by weight. The geopolymer samples were cured at room temperature for 28 days before exposed to an elevated temperature up to 1000 °C. The incorporation of 2% silica fume did not cause significant improvement in the compressive strength of unexposed geopolymer. Higher silica fume content of 4% reduced the compressive strength of the unexposed geopolymer. When subjected to elevated temperature, geopolymer with 2% silica fume retained higher compressive strength at 1000 °C. The addition of silica fume in fly ash geopolymer caused a lower degree of shrinkage and expansion, as compared to geopolymer without the addition of silica fume. Crystalline phases of albite and magnetite were formed in the geopolymer at 1000 °C