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冬季浇灌的混凝土,由于气温低,混凝土难免要遭受冻害。混凝土在早期遭受冻害后,强度增长缓慢内部结构产生微裂纹,物理力学性能恶化,因而在混凝土冬季施工中防止混凝土早期受冻是人们颇为关心的问题。大量的试验研究结果表明,如果混凝土在冻结前达到一定强度时,遭受冻结,则负温度对混凝土性能的损害就较小或者不损害,这一最低强度值即谓之混凝土受冻前的允许临介强度值。
Due to the low temperature of concrete poured in winter, the concrete will inevitably suffer from freezing damage. After the concrete suffered freezing injury in the early stage, the strength increased slowly. The internal structure produced microcracks and the physical and mechanical properties deteriorated. Therefore, it is a matter of considerable concern to prevent the concrete from being frozen early in the winter construction of concrete. A large number of experimental studies have shown that if the concrete freezes before it reaches a certain strength, the negative temperature will have little or no damage to the performance of the concrete. This minimum strength value means that the concrete is allowed to freeze before it is frozen. Mediation value.