Creep and Drying Shrinkage of Different Fly Ash-Based Geopolymers

Gunasekara, C, Setunge, S and Law, D 2019, 'Creep and Drying Shrinkage of Different Fly Ash-Based Geopolymers', ACI Materials Journal, vol. 116, no. 1, pp. 39-49.


Document type: Journal Article
Collection: Journal Articles

Title Creep and Drying Shrinkage of Different Fly Ash-Based Geopolymers
Author(s) Gunasekara, C
Setunge, S
Law, D
Year 2019
Journal name ACI Materials Journal
Volume number 116
Issue number 1
Start page 39
End page 49
Total pages 11
Publisher American Concrete Institute
Abstract Fly ash geopolymer concrete is a sustainable green construction material that has outstanding mechanical performance and is a low-energy material with a low carbon footprint. In this study, a detailed investigation of the long-term creep and drying shrinkage of three different 100% fly ash geopolymer concretes was carried out up to 1 year of age. Two geopolymers, produced from Gladstone and Pt. Augusta fly ashes, achieved approximately 700 microstrain at the end of 1 year-equivalent to the total creep strain displayed by portland cement (PC) concrete. Moreover, both geopolymer concretes displayed a lower creep coefficient than PC concrete. Hence, AS 3600 or the CEB-FIP model could be conservatively used to predict creep coefficient for two geopolymers. However, the Tarong fly ash geopolymer concrete differed significantly from the other geopolymers and achieved approximately 1900 microstrain after 1 year. The drying shrinkage of Gladstone and Pt. Augusta geopolymer concretes at 1 year are 175 and 190 microstrain, respectively, while Tarong geopolymer and PC concrete achieved 615 and 475 microstrain, respectively. All the fly ash geopolymer concrete showed lower drying shrinkage than the maximum permitted value recommended by AS3600. Incorporation of calcium-aluminasilicate-hydrate (C-A-S-H) gel with the sodium-alumina-silicatehydrate (N-A-S-H) geopolymeric gel was seen to positively affect the packing density of the gel phase. The degree of uniformity and compactness of aluminosilicate gel matrix together with the macroporosity in the 50 nm to 1 µm range was identified as determining the long-term creep and drying shrinkage of the 100% low-calcium fly ash geopolymer concrete.
Subject Construction Materials
Keyword(s) Compressive strength
Creep
Drying shrinkage
Fly ash
Geopolymer concrete
Microstructure development
Porosity distribution
DOI - identifier 10.14359/51706941
Copyright notice Copyright © 2019, American Concrete Institute. All rights reserved, including the making of copies unless permission is obtained from the copyright proprietors.
ISSN 0889-325X
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