Piotr Prochon1, Zengfeng Zhao2, Luc Courard2, Tomasz Piotrowski1, Frédéric Michel2, Andrzej Garbacz1. 1. Department of Building Materials Engineering, Faculty of Civil Engineering, Warsaw University of Technology, Armii Ludowej 16, 00-637 Warsaw, Poland. 2. Urban and Environmental Engineering, Université de Liège, Allée de la découverte 9, Sart Tilman Campus 4000 Liège, Belgium.
Abstract
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.
The aim of this work was to study the influence of the type of activator on the formulation of modified fly ash based pan class="Chemical">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/dm3NaOH 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.
Authors: Karol Prałat; Justyna Ciemnicka; Artur Koper; Michał Marek Szczypiński; Piotr Łoś; Van Vu Nguyen; Van Su Le; Cezary Rapiejko; Roberto Ercoli; Katarzyna Ewa Buczkowska Journal: Polymers (Basel) Date: 2022-05-13 Impact factor: 4.967
Authors: Noor Fifinatasha Shahedan; Mohd Mustafa Al Bakri Abdullah; Norsuria Mahmed; Andri Kusbiantoro; Sam Tammas-Williams; Long-Yuan Li; Ikmal Hakem Aziz; Petrică Vizureanu; Jerzy J Wysłocki; Katarzyna Błoch; Marcin Nabiałek Journal: Materials (Basel) Date: 2021-02-08 Impact factor: 3.623