Buletinul Institutului Politehnic din Iași Secția Chimie și Inginerie Chimică ISSN: 2537-2947
ISSN-L: 0254-7104
2024, Volume 70(74), Issue 3 (September), pp. 9 - 21
Geopolymer Composite Made for High Temperature Applications
LUCIAN PĂUNESCU, Daily Sourcing & Research SRL Bucharest, Romania, lucianpaunescu16@gmail.com BOGDAN VALENTIN PĂUNESCU, Consitrans SA Bucharest, Romania
ENIKÖ VOLCEANOV, National University of Science and
Technology “Politehnica” Bucharest, Faculty of Engineering in Foreign Language,
Bucharest, Romania, Metallurgical Research Institute SA Bucharest, Romania
Abstract: Geopolymer composite for high temperature applications was made using masonry rubble waste resulting from building demolition (clay brick scraps and concrete scraps). It was known that the geopolymer has an initial fire resistance due to the inorganic network constituting its structure, but the concern for testing and improving the mechanical strength of this new material type exposed to high temperatures was not a research objective until recently. Geopolymer manufacturing included traditional by-products such as granulated metallurgical slag (predominantly) and fly ash as alumina-silicate materials with cementitious properties as well as the alkaline activator, in which NaOH was replaced with KOH due to its superior thermal resistance. Results showed that compressive strength recorded acceptable losses up to 800°C and higher at 1000°C, while flexural strength increased at 600 and 800°C compared to reference value and then decreased after heating to 1000°C.
Keywords: geopolymer composite, granulated slag, fly ash, clay brick, demolition waste.