Concentration Profiles of Tritium Penetrated into Concrete

Transfer of tritium in concrete coated with hydrophobic paints

“…The disks of cement paste and mortar made up above have a porous structure. Part of the cement changes to hydrate crystals such as ettringite of 3CaO-Al 2 O 3 -3CaSO 4 -nH 2 O in the course of the curing time as shown in our previous study [16]. After the curing time for two months, some of the disks are coated with any of the two kinds of an epoxy polymer resin paint, which commercial name is "2-part Epoxy Waterproof", Asahipen Co., Japan, and an acrylicsilicon polymer resin paint, which commercial name is "Water base Supercoat", Asahipen Co., Japan.…”

“…T transfer in concrete has been correlated in terms of effective diffusivity [4][5][6][13][14][15][16][17][18]. However, there are fewer researches on behavior of T transfer in concrete coated with hydrophobic paints [11,12,19].…”

Effect of hydrophobic paints coating for tritium reduction in concrete materials

“…The weight and thickness of cement paste pellets after curing are around 10.6 g and 7.5 mm on the average. In this experiment, the cement paste pellets are prepared as representative of concrete materials because aggregates in concrete and mortar hardly have a capacity to trap tritium in them according to previous reports [2,9,10]. Various thicknesses of the paints are dried off in the molds as well as the cement paste pellets.…”

“…Basic tritium transport phenomena in concrete materials have been reported [1][2][3][4][5][6][7][8]. Diffusion of tritium in concrete, mortar and cement paste was investigated by a permeation method [3,8] and a soaking method [1,2,[4][5][6].…”

“…Diffusion of tritium in concrete, mortar and cement paste was investigated by a permeation method [3,8] and a soaking method [1,2,[4][5][6]. Rate-determining step of tritium migration through concrete materials is diffusion in pores of cement paste, and the diffusivity is reported in the range of 10 −11 -10 −12 m 2 /s.…”