The effect of curing conditions on compression strength and porosity of metakaolin-based geopolymers
2013 (English)In: Developments in Strategic Materials and Computational Design IV, John Wiley & Sons, 2013Conference paper (Refereed)
Geopolymers have been suggested to use as construction, waste treatment and fire proof materials and even drug delivery material due to its excellent mechanical strength, chemical stability and flame resistance. The aim of this study was to investigate the influence of temperature, time and humidity during curing on mechanical strength and porosity of geopolymers.
The geopolymer precursor paste was obtained by mixing metakaolin, waterglass and de-ionized water. The paste was molded into cylindrical rubber moulds (6 12 mm) and cured under different conditions: i.e. temperatures (ambient temperature, 37°C and 90°C), humidity and time (24, 48 and 96 hours). The compressive strength was determined using a universal testing machine. Helium pycnometer was used to measure the porosity. Via x-ray diffraction the phase composition of the cured samples was determined.
Elongated curing slightly decreased the total porosity of the tested geopolymers. Higher curing temperature increased the compressive strength after 24 hour but did not affect strength for longer curing times. In general, the samples cured in moisture had higher mechanical strength than those cured in air. But low compression strength of samples cured under high temperature and long time showed that some water content in geopolymer was essential to retaining its microstructure.
Place, publisher, year, edition, pages
John Wiley & Sons, 2013.
, Ceramic Engineering and Science Proceedings
IdentifiersURN: urn:nbn:se:uu:diva-219258DOI: 10.1002/9781118807743.ch5OAI: oai:DiVA.org:uu-219258DiVA: diva2:698832
37th International Conference and Expo on Advanced Ceramics and Composites; 27 Jan - 1 Feb 2013; Daytona Beach, Fia., USA
FunderSwedish Research Council