Influence of Activators on Mechanical Properties of Modified Fly Ash Based Geopolymer Mortars

[en] The aim of this work was to study the influence of the type of activator on the formulation of modified fly ash based geopolymer mortars. Geopolymer and alkali-activated materials (AAM) were made from fly ashes derived from coal and biomass combustion in thermal power plants. Basic activators (NaOH, CaO, and Na2SiO3) were mixed with fly ashes in order to develop binding properties other than those resulting from the use of Portland cement. The results showed that the mortars with 5 mol/dm3 of NaOH and 100 g of Na2SiO3 (N5-S22) gave a greater compressive strength than other mixes. The compressive strengths of analyzed fly ash mortars with activators N5-S22 and N5-C10 (5 mol/dm3 NaOH and 10% CaO) varied from 14.3 MPa to 5.9 MPa. The better properties of alkali-activated mortars with regular fly ash were influenced by a larger amount of amorphous silica and alumina phases. Scanning electron microscopy and calorimetry analysis provided a better understanding of the observed mechanisms.

Disciplines :

Materials science & engineering

Author, co-author :

Prochon, Piotr ; Université de Liège - ULiège > Doct. sc. ingé. & techno. (archi., génie civ. - paysage)

Zhao, Zengfeng ; Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil

Courard, Luc ; Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil

Piotrowski, Tomasz; Warsaw University of Technology > Faculty of Civil Engineering

Michel, Frédéric ; Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil

Garbacz, Andrzej; Warsaw University of Technology > Faculty of Civil Engineering

Language :

English

Title :

Influence of Activators on Mechanical Properties of Modified Fly Ash Based Geopolymer Mortars

Publication date :

25 February 2020

Journal title :

Materials

eISSN :

1996-1944

Publisher :

MDPI, Basel, Switzerland

Special issue title :

Polymer in/on Concrete

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://www.mdpi.com/1996-1944/13/5/1033#cite

Available on ORBi :

since 01 March 2020

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