Eco-geopolymers: physico-mechanical features, radiation absorption properties, and mathematical model / Neslihan Doğan-Sağlamtimur, Ahmet Bilgil, Sefa Ertürk, Vakkas Bozkurt, Elif Süzgeç, Arife Gözde ... więcej

Eco-geopolymers: physico-mechanical features, radiation absorption properties, and mathematical model / Neslihan Doğan-Sağlamtimur, Ahmet Bilgil, Sefa Ertürk, Vakkas Bozkurt, Elif Süzgeç, Arife Gözde Akan, Pervin Nas, Hüseyin Çetin, Magdalena Szechyńska-Hebda, Marek Hebda // Polymers [Dokument elektroniczny]. – 2022, Vol. 14, Iss. 2, Spec. Iss., 19 s. : rys., schem., tab., wykr. – Tryb dostępu: https://www.mdpi.com/2073-4360/14/2/262. – Oznaczenie ref./art.: 262. – Bibliogr. 63 poz., Abstr. – Special Issue: Advances in Functional Polymeric Materials. – doi: 10.3390/polym14020262. – ISSN 2073-4360

Waste ashes and radiation are hazardous environmental and health factors; thus, a lot of attention is paid to their reduction. We present eco-geopolymer building materials (GPBMs) based on the class F ... więcej

Waste ashes and radiation are hazardous environmental and health factors; thus, a lot of attention is paid to their reduction. We present eco-geopolymer building materials (GPBMs) based on the class F fly ashes (FFAs) from thermal power plants (TPPs) and their implementation as a barrier against radioactive radiation. Different methods of production, ratios of FFA to alkali activator, and temperatures of curing were tested. Small spherical particles and higher content of SiO2 resulted in developed surface area and higher reactivity of Isken TPP FFA than Catalagzi TPP FFA. Lower activator concentration (10% vs. 20%) and curing temperature (70 vs. 100 C) caused an increase in GPBM compressive strength; the highest value was measured as 93.3 MPa. The highest RA was measured for GPBMs, provided alkali activator ratio (Na2SiO3/NaOH) was >2 and its concentration was 20%. The mathematical model developed in this study proved FFA quantity, and thus GPBM mechanical properties, as key factors influencing RA. In the light of these results, the lightweight GPBMs can be excellent materials for the construction sector dedicated to immobilization, storage, and disposal for radionuclides or barriers against radiation; however, multiple steps of their production require careful optimization.