Buletinul Institutului Politehnic din Iași Secția Chimie și Inginerie Chimică ISSN: 2537-2947
ISSN-L: 0254-7104
2024, Volume 70(74), Issue 4 (December), pp. 9 - 19
Modern Mechano-Chemical Procedure for Obtaining a High-Strength
Geopolymer Composite
LUCIAN PĂUNESCU, Daily Sourcing & Research SRL,
Bucharest, Romania,
lucianpaunescu16@gmail.com ENIKÖ VOLCEANOV, Faculty of Engineering in Foreign
Language, National University of Science and Technology “Politehnica”
Bucharest, Romania; Metallurgical Research Institute SA Bucharest, Romania
BOGDAN VALENTIN PĂUNESCU, Consitrans SA Bucharest,
Romania
Abstract Replacing the usual alkaline solution with sodium
metasilicate nonahydrate as an alkaline activator of alumina-silicate waste
for the manufacture of geopolymers represents a recent technical solution
for significantly increasing their mechanical resistance. The principle of
this method was tested in an own version by the authors’ team of the current
work. Coal fly ash, river sand, and silica fume (nano-silica) were solid
precursors used in the starting material mixture. Under the conditions of
pressing the geopolymer powder (made by the conventional method) at the
axial pressure of 400 daN·cm-2, compared to its value of 1000 daN·cm-2 used
by (Nishikawa et al., 2022), the level of resistance to compression and
flexure reached values very high, superior compared to that of usual
geopolymers. Keywords: geopolymer composite, alumina-silicate, sodium
metasilicate nonahydrate, pressure, mechanical resistance