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摘要: 为了研究中国北方寒冷地区机场道面混凝土冻融破坏的评价指标, 制作了3种不同抗冻性能的混凝土试件, 采用快速冻融试验机对混凝土试件进行了冻融破坏试验, 并用动弹仪DT-10W测试了试件的动弹性模量, 分析了不同冻融循环次数作用下试件相对动弹性模量、压折强度、质量损失及表面剥落的变化规律, 给出了机场道面混凝土冻融破坏的临界值。试验结果表明: 随着冻融循环次数的增加, 试件的压折强度均有不同程度的下降, 其中抗折强度的损失较大, 且试件表面剥落面积及深度增大, 质量损失对试件表面平整度的影响严重。根据试件在冻融过程中相对动弹性模量与抗折强度损失、表面剥落与质量损失的规律, 建议以300次快速冻融循环后混凝土试件相对动弹性模量不小于75% (抗折强度损失率不大于46%) 和质量损失率小于1.0% (中等剥落) 作为机场道面混凝土冻融破坏的评价指标。Abstract: In order to research the evaluation indices of freezing-thawing destruction for airfield runway concrete in north cold area of China, three concrete examples with anti-freezing capability were made, and their freezing-thawing devastating experiment was done by rapid freezing experimental machine. Their dynamic moduli of elasticity were measured by DT-10W, and the changing rules of relative dynamic moduli of elasticity, flexural strength losses, concrete mass losses and surface scale-offs under different freezing-thawing cycles were analyzed.The critical value of freezing-thawing destruction was presented for airfield runway concrete. Experimental result indicates that as freezing-thawing cycles accumulate, the compressive and flexural strengthes decline at different rates for the samples, of which the flexural strengthes lose more faster.The surface scaling areas and depthes of concretes become serious and mass losses have severe influence on the surface smoothnesses of the samples. According to the rules, the evaluation indices are put forward after 300 freezing-thawing cycles, which is that relative dynamic modulus of elasticity is less than 75% (flexural strength loss ratio is not more than 46%) and mass loss ratio is less than 1.0% (moderate surface scale-off).
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图 1 冻融循环对混凝土动弹性模量及强度的影响
Figure 1. Effect of freezing-thawing cycle on relative moduli of elasticity and strengthes of concretes
表 1 混凝土配合比与抗折强度试验结果
Table 1. Experimental results of mixing ratios and flexural strengthes of concretes
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