Abstract
A method for the determination of the diffusion coefficient of materials by using the radioactive gas radon is presented. This gas is inert and extremely low concentrations can be detected because of the radioactive decay. The method was applied to mortars and concretes in order to optimise their composition with respect to a low radon diffusion rate. These optimised materials are to be used for concrete slabs in buildings. Compared to regular concrete, a reduction of the radon diffusion rate by more than 90% could be achieved.
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