Fly ash and ground granulated blast furnace slag-based alkali-activated concrete: Mechanical, transport and microstructural properties

[Display omitted] •Fly ash-based alkali-activated concrete has been developed using the Taguchi method.•Effect of adding GGBS on compressive strength and microstructural of fly ash-based alkali-activated concrete.•Sorptivity and permeability testing on fly ash-based alkali-activated concrete.•GGBS i...

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Bibliographic Details
Published in:Construction & building materials 2020-10, Vol.257, p.119548, Article 119548
Main Authors: Mehta, Ankur, Siddique, Rafat, Ozbakkaloglu, Togay, Uddin Ahmed Shaikh, Faiz, Belarbi, Rafik
Format: Article
Language:English
Subjects:
Alkali-activated concrete
Compressive strength
Engineering Sciences
Fly ash
GGBS
Mechanics
Permeability
Sorptivity
Taguchi method
Thermics
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Summary:[Display omitted] •Fly ash-based alkali-activated concrete has been developed using the Taguchi method.•Effect of adding GGBS on compressive strength and microstructural of fly ash-based alkali-activated concrete.•Sorptivity and permeability testing on fly ash-based alkali-activated concrete.•GGBS inclusion promoted high early age compressive strength and improved transport properties. The present study optimizes various parameters such as ratio of alkali solution-fly ash, sodium silicate-sodium hydroxide, fine aggregates-total aggregates, sodium hydroxide concentration, total aggregate content and curing temperatures for the development of fly ash-based alkali-activated concrete using Taguchi method. Also, GGBS is included (0–20%) and further properties such as compressive strength, sorptivity, chloride permeability and microstructural properties of the resultant GGBS-based alkali-activated concrete are studied. Results showed the coexistence of calcium-based hydration products CSH and CASH along with the polymerization products NASH, making the matrix of alkali-activated binder more compact with lesser cracks and pore spaces. The above changes are also reflected in the increase observed in the compressive strength by approximately 52%, and the reductions in the sorptivity and chloride ion penetration by 35% and 78%, respectively, with increasing GGBS content from 0 to 20% in heat cured fly ash based alkali-activated concrete.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2020.119548