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Title |
Characteristics of Pore Structure and Chloride Penetration Resistance of Concrete Exposed to Freezing-Thawing
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Keywords |
동결융해 ; 공극구조 ; 염화물침투저항성 ; 내구성 ; 콘크리트 열화 Freezing-Thawing ; Pore structure ; Chloride penetration resistance ; Durability ; Concrete degradation |
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Abstract |
Concrete structures are commonly exposed to freezing-thawing condition. This freezing-thawing action changes the pore structure of concrete, and it can reduce the durability of concrete. In this study, the change of the internal pore structure and durability of concrete due to freezing-thawing action are investigated. According to results, the excellent durability records were reported by the existing evaluation methods for all mixes. However, the pores, 50∼100nm size in diameter, are increased in concrete specimens exposed to freezing-thawing action, and the chloride penetration resistance was significantly reduced. The linear relationship between pore structure and chloride penetration resistance was shown in water cured concrete. Meanwhile, the linear relationship was decreased when concrete is exposed to freezing-thawing condition. It is desirable to review the criterion of durability evaluation for concrete specimens exposed to freezingthawing and chloride attack condition, simultaneously.
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