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首页> 外文期刊>Transportation Research Record >Air-Void Characteristics of Concretes in Different Applications
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Air-Void Characteristics of Concretes in Different Applications

机译：不同应用中混凝土的气孔特性

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Concrete that can be critically saturated and exposed to cycles of freezing and thawing must be properly air entrained for long-lasting service. Otherwise, cracking occurs, with the resultant deterioration of the concrete. Air voids must be small in size, closely spaced, and uniformly distributed to ensure adequate resistance to freezing and thawing as well as satisfactory strength. An increase in air volume results in a reduction in strength. Air content is affected by material properties, including water and admixture content, and construction practices, including pumping and consolidation. The air entrainment and air-void system in concretes that have a stiff consistency, are pumped, or have a large amount of high-range water-reducing admixture are addressed. Under those conditions an improper air-void system may result and may have an adverse effect on the concrete's resistance to freezing and thawing. Thus, the air-void system must be evaluated and necessary precautions taken. Precautions taken by the Virginia Department of Transportation are summarized.
机译：可能会严重饱和并经受冷冻和解冻循环的混凝土必须经过适当的加气处理才能长期使用。否则，会发生开裂，从而导致混凝土变质。气孔必须小巧，间隔紧密且均匀分布，以确保足够的抗冻融性和令人满意的强度。空气量增加导致强度降低。空气含量受材料特性（包括水和外加剂含量）以及施工方法（包括泵送和固结）影响。解决了具有坚硬稠度，被泵送或具有大量高范围减水剂的混凝土中的引气和气隙系统。在这些情况下，可能会导致不适当的气孔系统，并可能对混凝土的抗冻融性产生不利影响。因此，必须对气隙系统进行评估并采取必要的预防措施。弗吉尼亚运输部采取了一些预防措施。

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