Fly-ash based geopolymer mortar for high-temperature application – effect of slag addition
Authors:
- Izabela Hager,
- Mateusz Sitarz,
- Katarzyna Mróz
Abstract
Geopolymers are used as a Portland cement alternative in some applications. The motivation for using geopolymers is their capacity of the by-products and waste incorporation, contributing to a cleaner environment. The present study aims to evaluate the impact of temperature exposure (up to 1000 °C) on the microstructure and the mechanical properties of the geopolymer mortars. Four mixes were investigated with fly ash as the main precursor with four levels of slag replacement 0, 10, 30, and 50 wt%. To evaluate damage evolution, mechanical performances and identification tests were performed: ultrasonic pulse velocity, scanning electron microscope, mercury intrusion porosimetry, thermal strains measurements, differential thermal analysis and thermogravimetry. The research aimed to develop a mortar composition that is thermally stable at high temperature. Although slag addition improves the mechanical performances of fly ash geopolymer mortar considerably (compressive strength above 100 MPa), the mortar with no slag addition yielded better performances at high temperature. In this study, manufactured mortars exhibited a 30% strength increase and doubled tensile strength at 200 °C. Moreover, for developed mixes, a compressive strength recovery of up to 90% at 1000 °C was observed, demonstrating the potential of fly ash geopolymer as high-temperature application material.
- Record ID
- CUT3dcf66cc2bd64a4b940f614709729e8d
- Publication categories
- ;
- Author
- Journal series
- Journal of Cleaner Production, ISSN 0959-6526, e-ISSN 1879-1786
- Issue year
- 2021
- Vol
- 316
- Pages
- [1-10]
- Article number
- 128168
- Other elements of collation
- fot.; tab.; wykr.; Bibliografia (na s.) - 9-10; Oznaczenie streszczenia - Abstr.; Data udostępnienia on-line - 2021-07-12; Numeracja w czasopiśmie - Vol. 316
- Keywords in English
- geopolymer mortar, fly ash, high temperature, mechanical properties, ground granulated blast furnace slag, thermal barrier
- DOI
- DOI:10.1016/j.jclepro.2021.128168 Opening in a new tab
- URL
- https://www.sciencedirect.com/science/article/pii/S0959652621023866?via%3Dihub Opening in a new tab
- Related project
- E-mobilność oraz zrównoważone materiały i technologie. . Project leader at PK: , ,
- Language
- eng (en) English
- License
- Score (nominal)
- 140
- Publication indicators
- = 109
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT3dcf66cc2bd64a4b940f614709729e8d/
- URN
urn:pkr-prod:CUT3dcf66cc2bd64a4b940f614709729e8d
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.