Eco-Geopolymers: Physico-Mechanical Features, Radiation Absorption Properties, and Mathematical Model

Polymers

Hüseyin Çetin¹  Ahmet Bilgil¹  Arife Gözde Akan²  Elif Süzgeç²  Neslihan Doğan-Sağlamtimur²  Pervin Nas²  Vakkas Bozkurt³  Sefa Ertürk³  Marek Hebda⁴  Magdalena Szechyńska-Hebda⁵ 

[1] Department of Civil Engineering, Niğde Ömer Halisdemir University, Nigde 51240, Turkey;Department of Environmental Engineering, Niğde Ömer Halisdemir University, Nigde 51240, Turkey;Department of Physics, Niğde Ömer Halisdemir University, Nigde 51240, Turkey;Faculty of Materials Engineering and Physics, Cracow University of Technology, Warszawska 24, 31-155 Krakow, Poland;The Plant Breeding and Acclimatization Institute—National Research Institute, Radzików, 05-870 Błonie, Poland;

关键词: environment;    fly ash;    geopolymer;    building material;    radiation absorption;    waste reuse;   

DOI  :  10.3390/polym14020262

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown