Deterioration of Durability and Fundamental Acceleration Mechanism of Neutralization of Concrete Due to Freezing and Thawing Action

概要

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The existing freezing and thawing test method leaves much room for improvement concerning the dimension and shape of specimen, and the exposure condition from the viewpoint of the materials science research; that is, the concrete specimen is too large and heavy and the testing time is so long that the testing itself is not intended for practical use in order to evaluate the durability. Thus, the authors have already reported that the standard cylindrical specimen(φ10×20cm) for the quality control of concrete is the best type and that the development of the accelerative test method by virtue of the exposure temperature of ±5℃. In addition, the phenomenal fact that the freezing and thawing action makes the neutralization accelerate has been discovered by the authors in recent year. Such a phenomenal fact is especially remarkable to the marine RC structures under the severe meteorological action. This paper mainly deals with the fundamental deterioration mechanism of durability at the early stage due to the freezing and thawing action, thereby being able well to explain the reason of neutralizing acceleration, by assuming the existence of the semipermeable membrane on the interface of air void shell.
社団法人日本材料学会の論文
2004-04-15