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Special Section Papers

Impact From Fly Ash as Additive to Concrete on the Radiation Exposure in Dwellings

[+] Author and Article Information
Govert de With

Nuclear Research and Consultancy Group (NRG),
NRG Arnhem,
Utrechtseweg 310, P.O. Box 9034,
Arnhem 6800 ES, The Netherlands
e-mail: G.deWith@nrg.eu

Manuscript received August 12, 2016; final manuscript received March 8, 2017; published online May 25, 2017. Assoc. Editor: Jean Koch.

ASME J of Nuclear Rad Sci 3(3), 030904 (May 25, 2017) (5 pages) Paper No: NERS-16-1089; doi: 10.1115/1.4036322 History: Received August 12, 2016; Revised March 08, 2017

Fly ash is widely used as a supplementary cementitious material in the production of cement and concrete, and improves durability and strength of the concrete. However, as for all materials of mineral origin, fly ash is a source for natural radioactivity; hence, its need for responsible use. The aim of this study is to investigate the radiation impact from fly ash as an additive to concrete compared against concrete without fly ash. For this purpose, eight concrete mixtures are experimentally tested, followed by a computation of the radiation dose when used as bulk material in building constructions. The results demonstrate an increase in the total radiation dose from around 0.8 mSv with no fly ash up to 0.92 mSv when fly ash is used. The increase mostly comes from external radiation, while the radon exhalation factor is reduced and sometimes even reduces the radon dose despite the higher radium content. The work has demonstrated that the impact from fly ash on the radiation exposure is limited when applied as a supplementary cementitious material. At the same time, fly ash provides real benefits to the quality and durability of the concrete. For this reason, exemption strategies for such applications should be developed.

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Figures

Grahic Jump Location
Fig. 1

Schematic view of the measuring arrangement for determination of the radon exhalation rate according to NEN 5699

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