养护龄期对混凝土抗冻性能的影响

Influence of Curing Period upon Frost Resistance of Concrete

通过C30和C40两种强度等级的基准抗冻混凝土和掺加掺合料的抗冻混凝土分别在养护龄期14d和28d开始冻融的试验研究,表明适当缩短养护龄期对混凝土的抗冻性能影响不大。建议允许14d养护龄期开始冻融试验,对缩短冻融试验周期意义重大。

Based on the experiments and studies of the reference frost-resistant concrete and the frost-resistant concrete added with admixgures, with the strength of both types of concrete graded C30 and C40 respectively, which were tested with freezing and thawing cycles begun when the concrete was 14 and 28 days old respectively, it is indicated that appropriate shortening of the curing period produces no much influence upon the frost resistance of concrete. It is therefore recommended that starting freezing and thawing tests when the concrete is 14 days old should be permitted, which will produce great significance for shortening the period of freeze-thaw testing of concrete.