Hot-pressed geopolymer

Navid Ranjbar*, Mohammad Mehrali, Mahmoud R. Maheri, Mehdi Mehrali

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

26 Citations (Scopus)

Abstract

This research explores the use of simultaneous heating and pressing techniques in order to enhance the mechanical properties of fly ash (FA) based geopolymer under relatively low temperature conditions to ensure minimum-porosity. Four effective parameters of pressing force, alkali activator/FA, duration of hot-pressing and sodium concentration are studied. Together with detailed experimental studies, our results reveal that the most dominant factor is the induced pressure. The main results indicated that the highest compressive strength of the geopolymer (134 MPa) could be obtained by employing the hot pressing, temperature and duration of 41.4 MPa, 350 °C and 20 min, respectively. The microstructure of the hot-pressed specimens showed more developed geopolymer matrix compared with conventional ones leading to higher compressive strength in much shortest time. The improved mechanical properties are generally attributed to the dense structure of the material and higher geopolymer gel production during the hot pressing process. However, further reaction of partially reacted particles improves the mechanical properties over time.

Original languageEnglish
Pages (from-to)14-22
Number of pages9
JournalCement and concrete research
Volume100
Early online date25 May 2017
DOIs
Publication statusPublished - Oct 2017
Externally publishedYes

Keywords

  • A. Acceleration
  • B. Characterization
  • D. Alkali activated cement
  • D. Fly ash
  • Hot-pressing

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