Mechanische Hochtemperatureigenschaften von flugaschebasierten Geopolymerbetonen
MetadataShow full item record
Copyright © 2016 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, BerlinMechanical properties of fly ash-based geopolymer concretes at high temperature. At present, concretes based on alkali-activated binders, so-called geopolymer concretes, are investigated intensively in the building materials industry and by the research community as environmentally friendly alternative to Portland cement-based concretes. These inorganic binders, which are based on industrial by-products such as fly ash and ground granulated blast furnace slag, exhibit high resistance against corrosive acids and salts, if properly designed. The mechanical properties of fly ash-based geopolymer concretes at high temperatures are subject of systematic investigations at the Bundesanstalt für Materialforschung und -prüfung (BAM) to create a basis for the structural design of fire exposed concrete members based on alkali-activated binders. The concrete specimens, produced with quartz aggregates or lightweight aggregates and heated to a maximum temperature of 750 °C, exhibited a decrease of compressive strength up to temperatures of ca. 300 °C, attributed to formation of microcracks caused by dehydration. At higher temperatures the compressive strength of the investigated geopolymer concretes recovered partly, due to sintering processes starting from ca. 500 °C. Because of this beneficial property when compared to conventional concretes, geopolymer concretes can potentially be applied in infrastructure facilities where fire resistance is critical. From the results of the thermomechanical tests stress-strain relationships are derived that can be used for the structural design of members made from geopolymer concretes.
Showing items related by title, author, creator and subject.
Hardjito, Djwantoro (2005)The use of Portland cement in concrete construction is under critical review due to high amount of carbon dioxide gas released to the atmosphere during the production of cement. In recent years, attempts to increase the ...
Shaikh, Faiz; Vimonsatit, Vanissorn (2014)This paper presents the compressive strength of fly-ash-based geopolymer concretes at elevated temperatures of 200, 400, 600 and 800 °C. The source material used in the geopolymer concrete in this study is low-calcium fly ...
Deb, Partha; Nath, Pradip; Sarker, Prabir (2013)The properties of concrete using fly ash based geopolymer as the binder were shown in recent studies. However, most of the previous studies focused on the properties of geopolymer concrete samples cured at high temperature. ...