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Preparation of fly Ash-Ladle furnace slag blended geopolymer foam via Pre-Foaming method with polyoxyethylene alkyether sulphate incorporation
Journal
Materials
ISSN
1996-1944
Date Issued
2022
Author(s)
Ng Hui-Teng
Catleya Rojviriya
Synchrotron Light Research Institute
Hasniyati Md Razi
Malaysian Nuclear Agency
Sebastian Garus
Malaysian Nuclear Agency
Marcin Nabiałek
Malaysian Nuclear Agency
Wojciech Sochacki
Malaysian Nuclear Agency
Ilham Mukriz Zainal Abidin
Malaysian Nuclear Agency
Ng Yong-Sing
Andrei Victor Sandu
Technical University of Iasi
Agata Śliwa
Silesian University of Technology
DOI
10.3390/ma15124085
Abstract
This paper uses polyoxyethylene alkyether sulphate (PAS) to form foam via pre-foaming method, which is then incorporated into geopolymer based on fly ash and ladle furnace slag. In the literature, only PAS-geopolymer foams made with single precursor were studied. Therefore, the performance of fly ash-slag blended geopolymer with and without PAS foam was investigated at 29–1000 °C. Unfoamed geopolymer (G-0) was prepared by a combination of sodium alkali, fly ash and slag. The PAS foam-to-paste ratio was set at 1.0 and 2.0 to prepare geopolymer foam (G-1 and G-2). Foamed geopolymer showed decreased compressive strength (25.1–32.0 MPa for G-1 and 21.5–36.2 MPa for G-2) compared to G-0 (36.9–43.1 MPa) at 29–1000 °C. Nevertheless, when compared to unheated samples, heated G-0 lost compressive strength by 8.7% up to 1000 °C, while the foamed geopolymer gained compressive strength by 68.5% up to 1000 °C. The thermal stability of foamed geopolymer was greatly improved due to the increased porosity, lower thermal conductivity, and incompact microstructure, which helped to reduce pressure during moisture evaporation and resulted in lessened deterioration.