This paper presents the experimental results on the effectiveness of commercial sealants on radon gas diffusion through fractured concrete. Two laboratory proven sealants (polysulfide and epoxy no-filler) as well as the standard polyurethane sealant were tested on fractured concrete samples under controlled conditions. The concrete samples were 4 " in length, 3.5 " in diameter and of standard 1:2:4 (cement:sand: pea gravel) composition with a waterzcement ratio of 0.5. An average fracture width of 0.05 " throughout the entire concrete sample was prefabricated using metallic shims during the casting process. The laboratory measurements show that the sealants: can reduce the effective diffusion coefficient by as much as 99.4 % when applied to the fracture and surrounding facial area of the concrete. Details of the experimental setup and procedures are discussed
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