Control of Frost Damage to Concrete by Surface Coating

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  • 表面被覆材によるコンクリートの凍害抑制

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This study comprehensively examines thee ffect of concrete surface coating material on the prevention of frost damage, conducting freezing and thawing tests of the Japan Society of Civil Engineers; new freezing and thawing test methods incorporating high-temperature drying conditions; and various tests on the performance of coating film. First, relatively excellent surface-coating materials for preventing frost damage were selected by tests with mortar specimens and coating film tests. Second, with these surface-coating materials, the effects of water cement ratio, curing methods and defects in concrete on the performance of coated concrete under freezing and thawing were investigated.<BR>From the test results, it was shown that coating material of flexible thick-film epoxy resin is the most effective in preventing frost damage; defects in concrete greatly affect flexural strength of concrete under freezing and thawing; and newly-proposed freezing and thawing tests can accelerate the deterioration of surface-coated concrete and the swelling of coating film itself.

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