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Title: Tailoring sodium-based fly ash geopolymers with variegated thermal performance
Authors: Lahoti, Mukund
Wijaya, Stephen Fransceda
Tan, Kang Hai
Yang, En-Hua
Keywords: Engineering::Civil engineering
Issue Date: 2020
Source: Lahoti, M., Wijaya, S. F., Tan, K. H. & Yang, E. (2020). Tailoring sodium-based fly ash geopolymers with variegated thermal performance. Cement and Concrete Composites, 107, 103507-.
Project: L2NICCFP1-2013-4
Journal: Cement and Concrete Composites
Abstract: Sodium-based fly ash geopolymers show great fire resistance potential and commercial advantage for structural applications. Hence, in current research, tailoring of sodium-based geopolymer mix design without changing the fly ash source has been studied. It was found that a wide variety of residual compressive strength ranging from significant reduction (~80%) to maintaining significant enhancement (~150%) after being exposed to 900 °C was observed. The contributory mechanisms were discovered by investigating their chemical stability, pore structures, volume stability, and strength endurance prior to and after exposure to high-temperature using different microstructure characterization techniques including XRD, FTIR, MIP, dilatometry, and SEM. Crack formation due to moisture migration, pore shrinkage, and re-crystallization of nepheline adversely affected compressive strength. Matrix densification due to shrinkage of pore and stronger inter-particle bonding due to viscous sintering, favored compressive strength gain. This work discusses at length these competing mechanisms influencing the residual compressive strength.
ISSN: 0958-9465
DOI: 10.1016/j.cemconcomp.2019.103507
Schools: School of Civil and Environmental Engineering 
Rights: © 2020 Elsevier Ltd. All rights reserved. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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