コンクリートの初期凍害に及ぼす凍結温度要因の影響に関する研究

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The factcr of freezing temperature as one of the weathering conditions is the most important factor influencing to early frost damage of concrete in case of winter concreting. It is the aim of this study to investigate the influence of this factor, such as freezing temperatures, rates, and freezing time to early frost damage of concrete. On the basis of this experimental results, the following conclusions would appear to be appropriate; 1. The factors of freezing temperature, such as freezing temperature, freezing rate, and faeezing time, are very influential to the early frost damage of concrete, and there are not so much difference of influence to early frost damage of concrete in case of non air-entraining concrete. 2. The use of intentionally entrained air by air-entraining agents shows excellent effect to the prevention of early frost damage of concrete against conditions varying freezing temperature, freezing rate, and freezing time except the case of insufficient initial curing of about 20°D・D in maturity. It is, therefore, necessary to take maturity of 40°D・D as the minimum initial curing to get good performance for the prevention of early frost damage of concrete even with the adequate air-entraining concrete. 3. It seems to be sure of the applicability of DEF (the Degree of Expansion by Frost) as an index of deterioration of concrete in early frost damage. 4. It is considered that there will be different mechanisms of cracks, pop-outs, and scalings generated during the early frost action influenced by the freezing temperature, freezing rate, and freezing time.
1978-05-30

コンクリートの初期凍害に及ぼす凍結温度要因の影響に関する研究

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