Abstract
Geopolymer concrete utilizes an alternate material including fly ash as binding material in place of cement. This fly ash reacts with alkaline solution (e.g., NaOH) and Sodium Silicate (Na 2 SiO 3 ) to form a gel which binds the fine and coarse aggregates. Since Geopolymer concrete is the emerging field, the guidelines from the Bureau of Indian Standards are yet to be formulated. An attempt has been made to find out an optimum mix for the Geopolymer concrete. Concrete cubes of size 150 × 150 × 150 mm were prepared and cured under steam curing for 24 hours. The compressive strength was found out at 7 days and 28 days. The results are compared. The optimum mix is Fly ash: Fine aggregate: Coarse aggregate (1:1.5:3.3) with a solution (NaoH&Na 2 SiO 3 combined together) to fly ash ratio of 0.35. High and early strength was obtained in the Geopolymer concrete mix.
Highlights
Geopolymer cement (Davidovits, 1984, 2008, 2010)represents a broad range of materials characterized by networks of inorganic molecule
Geopolymer concrete do not require any water for matrix bonding, instead the alkaline solution react with Silicon and Aluminium present in the flyash
Where M is a monovalent cation such as potassium or Sodium, the symbol – indicates the presence of a bond, n is the degree of polycondensation or polymerization and z is 1, 2,3 or higher, as reported earlier (Hardjito D, Wallah et al, 2004; Van Chanh Bui et al, 2008)
Summary
Institut Géopolymère, Saint-Quentin, France. Accessed on January 29 at http://www.geopolymer.org/science/introduction. BV (2004) On the development of fly ash–based geopolymer Concrete. ACI. Mater. J, 101 (6), 467– 5. Van Chanh Bui, Dang Trung and Dang Van Tuan (2008) Recent research geopolymer concreteNguyen during the 3rd ACF Int.Conf.-ACF/VCA. 6. Wallah SE and Rangan BV (2006) Low calcium fly ash based geopolymer concrete–Long term properties. Res. Report-GC2, Curtin University, Australia. pp:[76-80].
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