Alkali-activated concrete with Serbian fly ash and its radiological impact.
The present paper reports the results of a study on different types of fly ash from Serbian coal burning power plants and their potential use as a binder in alkali-activated concrete (AAC) depending on their radiological and mechanical properties. Five AAC mixtures with different types of coal burning fly ash and one type of blast furnace slag were designed. Measurements of the activity concentrations of40K,226Ra and232Th were done both on concrete constituents (fly ash, blast furnace slag and aggregate) and on the five solid AAC samples. Experimental results were compared by using the activity concentration assessment tool for building materials - the activity concentration index I, as introduced by the EU Basic Safety Standards (CE, 2014). All five designed alkali-activated concretes comply with EU BSS screening requirements for indoor building materials. Finally, index I values were compared with the results of the application of a more accurate index - I(ρd), which accounts for thickness and density of building materials (Nuccetelli et al., 2015a). Considering the actual density and thickness of each concrete sample index - I(ρd) values are lower than index I values. As an appendix, a synthesis of main results concerning mechanical and chemical properties is provided.
National Institute of Health, Technology and Health Department, viale Regina Elena, 299, 00167 Rome, Italy.
Cristina
C
Nuccetelli
Italian National Workers Compensation Authority (INAIL), Department of Medicine, Epidemiology, Workplace, Occupational and Environmental Hygiene, Via Fontana Candida 1, 00040 Monteporzio Catone, Rome, Italy.
Rosabianca
R
Trevisi
Faculty of Civil Engineering, University of Belgrade, Bulevar kralja Aleksandra 73, 11000 Belgrade, Serbia. Electronic address: ivani@imk.grf.bg.ac.rs.
Ivan
I
Ignjatović
Faculty of Civil Engineering, University of Belgrade, Bulevar kralja Aleksandra 73, 11000 Belgrade, Serbia.
Jelena
J
Dragaš
D000468:Alkalies / Q000737:chemistry; D060729:Coal Ash / Q000032:analysis*; D003252:Construction Materials / Q000032:analysis*; D011210:Power Plants; D011834:Radiation Monitoring; D055771:Serbia
D000468:Alkalies; D060729:Coal Ash
Activity concentration; Activity concentration index I; Alkali activated concrete; Blast furnace slag; Dose model; Fly ash