Evaluation of the effect of silica fume on amorphous fly ash geopolymers exposed to elevated temperature

Ong Huey Li, Liew Yun-Ming*, Heah Cheng-Yong, Ridho Bayuaji, Mohd Mustafa Al Bakri Abdullah, Foo Kai Loong, Tan Soo Jin, Ng Hui Teng, Marcin Nabiałek, Bartlomiej Jeż, Ng Yong Sing

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


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 1000C. 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 1000C. 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 1000C.

Original languageEnglish
Article number9
Pages (from-to)1-14
Number of pages14
Issue number1
Publication statusPublished - Jan 2021


  • Amorphous
  • Fly ash
  • Geopolymer
  • Silica fume
  • Thermal performance


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