摘要
本文简要地介绍了具有抗冻性要求混凝土有关的国内外规范规定,冻结温度对混凝土的影响及室内冻融试验的局限性。目前,尚不能建立室内结果与实际自然条件下混凝土冻害的相关关系。在室内冻融试验结果作为使用条件下混凝土耐久性的大致指标的前提下,提出我国不同的气候分区,采用相同的循环次数“等概率冻结温度”原则进行冻融试验,以代替现行规定的统一冻结温度,相应地取消规范中不同的抗冻标号的规定更趋合理。
A brief summing-up of foreign and domestic standards and criteria for frost resistant concrete is presented. The effect of freezing temperature upon concrete and the limitations of laboratory freeze-thaw tests are also discussed. It is still impossible to establish the correlation between laboratory results and the frost damage of concrete in natural environment. On the premise that laboratory results of freeze-thaw tests are used as the approximate durability indices of concrete in natural working environment, it is more advisable that, different climate zones should be established in China and the principle of 'equiprobability freezing temperature' with the same number of freezing and thawing cycles should be adopted to carry out freeze-thaw-tests, thus replacing the stiputaled unified freezing temperatures for freeze-thaw tests and removing accordingly different frost-resistance grades of concrete from relevant prevailing standards and criteria.
