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FURTHER INVESTIGATION ON RADON GAS DIFFUSION THROUGH FRACTURED CONCRETE SAMPLES COATED WITH A SEALANT

By Wessam Daoud and Kevin J. Renken

Abstract

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

Year: 2013
OAI identifier: oai:CiteSeerX.psu:10.1.1.371.9156
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