Cold-pressed fly ash geopolymers: effect of formulation on mechanical and morphological characteristics

This research uses low alkali activator content and cold pressing technique for fly ash-based geopolymers formation under room temperature condition. The geopolymers were prepared using four different parameters: fly ash/alkali activator ratio, sodium hydroxide concentration, sodium silicate/sodium...

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Bibliographic Details
Published inJournal of materials research and technology Vol. 15; pp. 3028 - 3046
Main Authors Shee-Ween, Ong, Cheng-Yong, Heah, Yun-Ming, Liew, Abdullah, Mohd Mustafa Al Bakri, Li Ngee, Ho, Chan, Lynette Wei Ling, Wan-En, Ooi, Jaya, Nur Ain, Yong-Sing, Ng
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.11.2021
Elsevier
Subjects
Cold press
Compressive strength
Flexural strength
Fly ash
Geopolymer
Fly ash
Geopolymer
Cold press
Compressive strength
Flexural strength
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Summary:This research uses low alkali activator content and cold pressing technique for fly ash-based geopolymers formation under room temperature condition. The geopolymers were prepared using four different parameters: fly ash/alkali activator ratio, sodium hydroxide concentration, sodium silicate/sodium hydroxide ratio and pressing force. The results indicated that the compressive strength (114.2 MPa) and flexural strength (29.9 MPa) of geopolymers maximised at a fly ash/alkali activator ratio of 5.5, a 14 M sodium hydroxide concentration, a sodium silicate/sodium hydroxide ratio of 1.5 and a pressing force of 5 tons (pressing stress of 100.0 MPa and 155.7 MPa for compressive and flexural samples, respectively). The degree of reaction (40.1%) enhanced the structure compactness with minimum porosity. The improved mechanical properties confirmed that a high strength pressed geopolymer could be formed at low alkali activator content without the aid of temperature.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2021.09.084