An increasing attention is currently paid to the possible use of eco-friendly binding materials as alternative to Portland cement, like geopolymers. Geopolymers are synthetized through the alkaline activation of an aluminosilicate source. Usually, activation is achieved by the addition of concentrated alkali metal hydroxide or silicate solutions; however, the harmful and corrosive nature of these alkali solutions make their use quite difficult in the production of binders, especially when they are cast at the construction site. This work focuses on the development of an ambient cured one-part “just add water” geopolymer-like binder to be used for the production of mortars. Metakaolin powder was mixed with different alkali activators (Ca(OH)2 or CaO, and sodium or potassium metasilicate), all in powder form. The reaction kinetic of the so obtained binders was analyzed at different curing times through XRD and SEM techniques. The influence of the alkali cations on the mechanical properties was preliminarily investigated through double punching tests at different times. These results were also integrated with flexural and compressive tests on prismatic specimens, after 7 and 28 days from casting. This preliminary investigation indicates that the use of a dry alkali activator can be very promising for the production of geopolymer-like binders, allowing the reaching of superior mechanical properties with respect to the reference formulation with liquid activator

Influence of alkali cations on the mechanical properties of geopolymer-like binders based on solid alkali activator / Bergamonti, Laura; Michelini, Elena; Graiff, Claudia; Pagliari, Federico; Potenza, Marianna; Talento, Francesco; Bondioli, Federica; Ferretti, Daniele. - ELETTRONICO. - (2022), pp. 537-546. ((Intervento presentato al convegno Proc. 6th fib Int. Congress 2022 tenutosi a Oslo, Norway nel 12-16June 2022.

Influence of alkali cations on the mechanical properties of geopolymer-like binders based on solid alkali activator.

Laura Bergamonti;Elena Michelini
;
Claudia Graiff;Federico Pagliari;Marianna Potenza;Federica Bondioli;Daniele Ferretti
2022-01-01

Abstract

An increasing attention is currently paid to the possible use of eco-friendly binding materials as alternative to Portland cement, like geopolymers. Geopolymers are synthetized through the alkaline activation of an aluminosilicate source. Usually, activation is achieved by the addition of concentrated alkali metal hydroxide or silicate solutions; however, the harmful and corrosive nature of these alkali solutions make their use quite difficult in the production of binders, especially when they are cast at the construction site. This work focuses on the development of an ambient cured one-part “just add water” geopolymer-like binder to be used for the production of mortars. Metakaolin powder was mixed with different alkali activators (Ca(OH)2 or CaO, and sodium or potassium metasilicate), all in powder form. The reaction kinetic of the so obtained binders was analyzed at different curing times through XRD and SEM techniques. The influence of the alkali cations on the mechanical properties was preliminarily investigated through double punching tests at different times. These results were also integrated with flexural and compressive tests on prismatic specimens, after 7 and 28 days from casting. This preliminary investigation indicates that the use of a dry alkali activator can be very promising for the production of geopolymer-like binders, allowing the reaching of superior mechanical properties with respect to the reference formulation with liquid activator
978-2-940643-15-8
Influence of alkali cations on the mechanical properties of geopolymer-like binders based on solid alkali activator / Bergamonti, Laura; Michelini, Elena; Graiff, Claudia; Pagliari, Federico; Potenza, Marianna; Talento, Francesco; Bondioli, Federica; Ferretti, Daniele. - ELETTRONICO. - (2022), pp. 537-546. ((Intervento presentato al convegno Proc. 6th fib Int. Congress 2022 tenutosi a Oslo, Norway nel 12-16June 2022.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2933712
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