Study of radon transport through concrete modified with silica fume |
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| Institution: | 1. Department of Materials and Structures, Faculty of Civil Engineering, University of Belgrade, Serbia;2. Institute of Radiochemistry and Radioecology, University of Pannonia, P.O. Box 158, H-8201, Veszprém, Hungary;1. School of Epidemiology and Public Health, Room 101, 600 Peter Morand Crescent, University of Ottawa, Ottawa, Ontario, Canada;2. Radiation Protection Bureau, Health Canada, 775 Brookfield Rd, Ottawa, Ontario, K1A 1C1, Canada;3. Construction Research Centre, National Research Council, 1200 Montreal Road, Ottawa, Canada |
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| Abstract: | The concentration of radon in soil usually varies between a few kBq/m3 and tens or hundreds of kBq/m3 depending upon the geographical region. This causes the transport of radon from the soil to indoor environments by diffusion and advection through the pore space of concrete. To reduce indoor radon levels, the use of concrete with low porosity and a low radon diffusion coefficient is recommended. A method of reducing the radon diffusion coefficient through concrete and hence the indoor radon concentration by using silica fume to replace an optimum level of cement was studied. The diffusion coefficient of the concrete was reduced from (1.63 ± 0.3) × 10?7 to (0.65 ± 0.01) × 10?8 m2/s using 30% substitution of cement with silica fume. The compressive strength of the concrete increased as the silica-fume content increased, while radon exhalation rate and porosity of the concrete decreased. This study suggests a cost-effective method of reducing indoor radon levels. |
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| Keywords: | Radon diffusion length Radon exhalation Compressive strength Silica fume Porosity |
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