Influence of Alkaline Concentration on Physical Properties of Porous Geopolymer Using Silica Fume as Foaming Agent

Abstract:

Porous geopolymer could be synthesized by using metakaolin and silica fume as foaming agent. The foam morphology was estimated in the function of water, silica fume content, and curing temperatures. Raw materials were mixed by Hobart mixer for 5 minutes and then poured in to cylinder mold after that cured at 70 degree celsius for 24 hours. During the synthesis process, the complex reaction would occur such as polycondensation and oxidation. These reactions affect to chemical and physical properties of porous sample. The parameters that mention above affect to density, physical, and chemical properties. The thermal conductivity of porous geopolymer that contained with 14 molal NaOH concentration yield the lowest values of 0.5101 W/mK and pore size distribution of 0.01-0.8 mm.Keywords: Porous geopolymer, thermal conductivity, metakaolin

• Periodical: Key Engineering Materials (Volume 659)
• Pages: 106-110
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.659.106
• Online since: August 2015
• Authors: Anut Saikrasoon, Sirithan Jiemsirilers*, Pitak Laoratanakul
• Keywords: Metakaolin, Porous Geopolymer, Thermal Conductivity

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