A comparative study of high- and low-Al2O3 fly ash based-geopolymers: the role of mix proportion factors and curing temperature

Zhou, Wei and Yan, Chunjie and Duan, Ping and Liu, Yi and Zhang, Zuhua and Qiu, Xiumei and Li, Dan (2016) A comparative study of high- and low-Al2O3 fly ash based-geopolymers: the role of mix proportion factors and curing temperature. Materials and Design , 95. pp. 63-74. ISSN 0264-1275


Developing sustainable and low-CO2 emission construction materials is of essential importance for reducing the environmental footprint of cement industry. In this work, ordinary circulating fluidized bed combustion fly ashes with different Al2O3 concentrations were used to prepare geopolymer. Upon XRD, SEM, FTIR and TG/DSC characterizations, the factors, including Si/Al ratio, the additional water/solid ratio, modulus of alkali activator (molar ratio of SiO2/Na2O) and curing temperature, had been investigated to reveal their influences to the mechanical and microstructural properties of geopolymers. For low-Al2O3 fly ash, the optimal synthesis conditions (curing temperature = 80 °C, Si/Al = 2:1, modulus = 1.5, additional water/solid ratio = 0.1) were obtained. Geopolymers modified with high-Al2O3 fly ash possess superior performance than that of low-Al2O3 fly ash modified samples, in terms of compressive strength and microstructure. This study proves that the application of lowAl2O3 fly ash can be used as a substitute material for geopolymer cement manufacture.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 04 Apr 2017 01:32
Last Modified: 04 Apr 2017 01:32
Uncontrolled Keywords: geopolymer; low-Al2O3 fly ash; mix proportion; compressive strength; microstructure
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091299 Materials Engineering not elsewhere classified
09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials
Identification Number or DOI: 10.1016/j.matdes.2016.01.084
URI: http://eprints.usq.edu.au/id/eprint/31061

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