Effect of Sodium Aluminate on the Fresh and Hardened Properties of Fly Ash-Based One-Part Geopolymer

The one-part geopolymer binder was synthesis from the mixing of aluminosilicate material with solid alkali activators. The properties of one-part geopolymers vary according to the type and amount of solid alkali activators used. This paper presents the effect of various sodium metasilicate-to-sodium...

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Bibliographic Details
Published in:Archives of metallurgy and materials 2022, Vol.67 (2), p.441-445
Main Authors: Wan-En, Ooi, Liew, Yun-Ming, Yong, Heah Cheng, Li-Ngee, Ho, Al Bakri Abdullah, Mohd Mustafa, Shee-Ween, Ong, Sandu, Andrei Victor
Format: Article
Language:English
Subjects:
Aluminosilicates
Aluminum
Anorthite
Calcium aluminum silicates
Coal-fired power plants
Compressive strength
Fly ash
geopolymer
Geopolymers
Homogeneous structure
Microstructural analysis
one-part geopolymer
Setting (hardening)
Silica
Sodium
Sodium aluminate
Sodium aluminum silicates
sodium metasilicate
Sodium silicates
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Summary:The one-part geopolymer binder was synthesis from the mixing of aluminosilicate material with solid alkali activators. The properties of one-part geopolymers vary according to the type and amount of solid alkali activators used. This paper presents the effect of various sodium metasilicate-to-sodium aluminate (NaAlO2/Na2SiO3) ratios on fly ash-based one-part geopolymer. The NaAlO2/Na2SiO3 ratios were set at 1.0 to 3.0. Setting time of fresh one-part geopolymer was examined through Vicat needle apparatus. Mechanical and microstructural properties of developed specimens were analysed after 28 days of curing in ambient condition. The study concluded that an increase in NaAlO2 content delayed the setting time of one-part geopolymer paste. The highest compressive strength was achieved at the NaAlO2/Na2SiO3 ratio of 2.5, which was 33.65 MPa. The microstructural analysis revealed a homogeneous structure at the optimum ratio. While the sodium aluminium silicate hydrate (N-A-S-H) and anorthite phases were detected from the XRD analysis.
ISSN:1733-3490
2300-1909
DOI:10.24425/amm.2022.137775