20.500.12556/DiRROS-15862 Potential usage of hybrid polymers binders based on fly ash with the addition of PVA with satisfying mechanical and radiological properties Since recycled technologies usage is mandatory for environmental safety, and in this regard, it is important to examine new materials that can be used in construction and are primarily produced from fly ash. In addition to characteristics such as hardness and compressive strength, the given materials must also be radiologically and environmentally safe. The main concept of engineered geopolymer gel composites based on fly ash residues is focused on developing binder materials via gel formation processes that can replace ordinary cement materials. This study is unique in researching the potential use of fly ash from the Nikola Tesla thermal power plant in Serbia, where the hybrid geopolymeric materials synthesized from fly ash are experimentally examined with the addition 1 wt% and 2 wt% of polyvinyl alcohol (PVA). This paper aims to investigate the structural, morphological, mechanical, and radiological properties of hybrid materials with the addition of PVA and without additive in the period of ageing for 28 days at room temperature. The phase composition was investigated using X-ray powder diffraction (XRPD) analysis, while morphological characteristics of these materials were examined using scanning electron microscopy and energy dispersive X-ray analysis (SEM-EDS). Vibrational spectra of obtained samples are investigated using diffuse reflectance infrared Fourier transform (DRIFT) and Fourier transform infrared (FTIR) techniques. The hardness and compressive strength are also examined, indicating that the 1 wt% addition in geopolymeric matrix results in the best mechanical properties. Radiological measurements of investigated all geopolymer samples show decreasing activity concentrations of radionuclides for 50% compared to fly ash. geopolymer gel inorganic binders hybrid materials fly ash radiological properties strength open access geopolimerni gel anorganska veziva hibridni materiali elektrofitrski pepel radiološke lastnosti trdnost odprti dostop true false true MDPI AG Angleški jezik Slovenski jezik © 2021 by the authors. Licensee MDPI, Basel, Switzerland. Neznano 2022-12-01 10:03:10 2023-05-12 09:43:12 2023-05-13 03:37:07 0000-00-00 00:00:00 2021 0 0 Nasl. z nasl. zaslona; Opis vira z dne 20. 12. 2021; Št. članka 270; str. 1-12 iss. 4 Vol. 7 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2021-12-16 620.1/2 2310-2861 10.3390/gels7040270 90173699 https://www.mdpi.com/2310-2861/7/4/270 1 c3e74f7d-714e-11ed-a69a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=20979 RAZ_Mirkovic_Miljana_2021.pdf RAZ_Mirkovic_Miljana_2021.pdf 1 33E6620CACBB1551DAA3D9F801EF9879 aba8befcac1b029da4f8ee55344f6ef10e572239e24c6fd6efe023f126866555 1b3254fd-9b08-11ed-b359-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=21424 Zavod za gradbeništvo Slovenije 0 0 0