Effect of adding mineral additives to alkali-activated natural pozzolan paste

Dali Bondar

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)


Natural pozzolans are raw materials from geological deposits with a range of chemical compositions that when combined with suitable alkali activators can be converted to geopolymer cement for concrete production. In this paper the concept of adding mineral additives to enhance the properties of geopolymer cement is introduced. Taftan andesite, a natural Iranian pozzolan, was used to study the effect of adding mineral additives such as kaolinite, lime and other calcined pozzolans on the compressive strength of geopolymer cement under both normal and autoclave curing. Scanning electron microscopy (SEM)/energy dispersive X-ray (EDX) was used to determine the composition of the gel phase in both alkali-activated Taftan pozzolan with and without mineral additions. The work has shown that deficiencies in SiO2, Al2O3 and CaO content in the raw natural pozzolan can be compensated for by adding mineral additives for enhanced properties.
Original languageEnglish
Pages (from-to)2906-2910
Number of pages5
JournalConstruction and Building Materials
Issue number6
Early online date15 Jan 2011
Publication statusPublished (in print/issue) - 1 Jun 2011


  • Alkali-activated cement
  • Natural pozzolan
  • Geopolymeric cement
  • Mineral additives


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