Water retention properties of porous geopolymers for use in cooling applications

Kiyoshi Okada, Asami Ooyama, Toshihiro Isobe, Yoshikazu Kameshima, Akira Nakajima, Kenneth J D MacKenzie

Research output: Contribution to journalArticle

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Abstract

A series of geopolymers were prepared with varying ratios of sodium silicate, metakaolinite, NaOH and H2O and their porous properties, water retention and mechanical properties were determined, to develop materials for counteracting heat island effects. Samples were prepared with the molar ratios SiO2:Al2O3:Na2O:H2O of 3.66:1:x:y, where x = 0.92-1.08 and y = 14.2-19.5. The porous and mechanical properties of the geopolymers showed a good correlation with the H2O/Al2O3 ratio (y); an increase in y produced an increase in the pore volume (from 0.26 to 0.46 ml/g), the pore size (from 15 to 390 nm) and the water absorption (from 27.2 to 51.1%). The same increase in y decreased the bulk density (from 1.29 to 0.99 g/cm3), the bending strength (from 14.2 to 2O/Al2O3 ratio is the most important factor for controlling the porous properties of these materials, since geopolymers with higher H2O/Al2O3 ratios are more porous and have higher water absorption rates, making them suitable as materials for surface cooling by water evaporation. Geopolymers with lower H2O/Al2O3 ratios are more suitable for water retention applications, and have the advantage of higher mechanical strength.

Original languageEnglish
Pages (from-to)1917-1923
Number of pages7
JournalJournal of the European Ceramic Society
Volume29
Issue number10
DOIs
Publication statusPublished - Jul 2009
Externally publishedYes

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Geopolymers
Cooling
Water
Water absorption
Mechanical properties
Bending strength
Thermal effects
Pore size
Strength of materials
Silicates
Evaporation
Sodium

Keywords

  • Geopolymer
  • Porosity
  • Silicate
  • Sol-gel processes
  • Structural applications

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Water retention properties of porous geopolymers for use in cooling applications. / Okada, Kiyoshi; Ooyama, Asami; Isobe, Toshihiro; Kameshima, Yoshikazu; Nakajima, Akira; MacKenzie, Kenneth J D.

In: Journal of the European Ceramic Society, Vol. 29, No. 10, 07.2009, p. 1917-1923.

Research output: Contribution to journalArticle

Okada, Kiyoshi ; Ooyama, Asami ; Isobe, Toshihiro ; Kameshima, Yoshikazu ; Nakajima, Akira ; MacKenzie, Kenneth J D. / Water retention properties of porous geopolymers for use in cooling applications. In: Journal of the European Ceramic Society. 2009 ; Vol. 29, No. 10. pp. 1917-1923.
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