Self-Leveling Geopolymer Concrete Using Alkali-Activated Fly Ash

Gadkar, Anvit and Subramaniam, Kolluru V.L. (2021) Self-Leveling Geopolymer Concrete Using Alkali-Activated Fly Ash. ACI Materials Journal, 118 (2). pp. 21-30. ISSN 0889325X

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Self-leveling concrete is developed with low-calcium alkali activated fly ash (AAF) binder paste. The rheological behavior of AAF pastes with different compositions is evaluated. AAF pastes are proportioned with alkali-silicate activating solutions to ensure specific reactive oxide ratios for comparable geopolymer strength. The yield stress and the viscosity of the AAF binder paste vary with the silica content and the silica modulus (SiO2/Na2O mass ratio) in the alkali-silicate activating solution. The slump and flow behaviors of concrete mixtures made with AAF paste are evaluated. The requirements of the AAF binder characteristics, paste content, and aggregate packing for achieving self-leveling flow characteristics under gravity-induced flow are assessed. The transition from a frictional to a flow-Type behavior in concrete mixtures depends on the AAF binder paste content. Self-leveling is achieved without the use of admixtures with an AAF binder paste of low yield stress and at a paste content of 45%. Improving the aggregate packing using the Fuller-Thompson curve and reducing the yield stress of the AAF binder paste increase the flow achieved in concrete mixtures. The specifications for cement-based self-consolidating concrete (SCC) are closely applicable for self-leveling AAF-based concrete.

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IITH Creators:
IITH CreatorsORCiD
Subramaniam, Kolluru V.L.UNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Alkali-Activated fly ash, Particle packing, Rheology, Viscosity, Yield stress
Subjects: Civil Engineering > Construction & Building Technology
Civil Engineering
Civil Engineering > Soil Structure Interaction
Civil Engineering > Geoenvironmental Engineering
Civil Engineering > Water resources engineering
Civil Engineering > Earthquake Engineering
Divisions: Department of Civil Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 29 May 2021 04:43
Last Modified: 29 May 2021 04:43
Publisher URL:
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