Method for comprehensive mix design of fly ash geopolymer mortars

•A new mix design method has been developed and validated for FA–GPC mortars.•The input parameters are specified compressive strength, specified workability, α, β.•The output parameters are L/FA, SS/SH, xM.•The method concept can be applied to various types of fly ash and geopolymers, generally. Thi...

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Bibliographic Details
Published in:Construction & building materials 2019-03, Vol.202, p.704-717
Main Authors: Naghizadeh, A., Ekolu, S.O.
Format: Article
Language:English
Subjects:
Fly ash
Geopolymers
Method concept
Mix design
Mortars
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Summary:•A new mix design method has been developed and validated for FA–GPC mortars.•The input parameters are specified compressive strength, specified workability, α, β.•The output parameters are L/FA, SS/SH, xM.•The method concept can be applied to various types of fly ash and geopolymers, generally. This paper presents the development of a new mix design method for fly ash geopolymer mortars activated using combined sodium silicate and sodium hydroxide solutions. For a specified value of compressive strength, specified value of workability, and known chemical properties of the sodium silicate solution to be used in a mixture, the proposed method generates mixture design parameters consisting of activator to fly ash ratio, sodium silicate to sodium hydroxide ratio, and molarity of sodium hydroxide. It was found that the actual compressive strengths and actual workability values obtained from tests were satisfactorily comparable to the designed values. The proposed method concept can be applied to generate relevant mix design charts for various types of geopolymer binders.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2018.12.185