本文分别在现场以及试验室内研究了某机场跑道混凝土出现严重的开裂和剥落现象的原因。碱集料反应以及冻融循环均会导致开裂和剥落,通过XRD、岩相分析以及集料的碱活性检测排除了发生碱集料反应的可能性。采用快冻法测试了机场跑道现场钻取的芯样混凝土的抗冻性。同时借助于显微镜、SEM、MIP分析了损伤混凝土的微观结构,揭示出跑道混凝土的损伤与抗冻性较差有关,并讨论了改善严酷地区混凝土耐久性的措施。
The damage cause of an airport runway shoulder has been explored both in field and in laboratory.Serious cracking and spalling appeared upon surface of the runway shoulder shortly after the airport was put into service.Both of alkali-aggregate reaction and freeze-thaw cycles may result in similar visible cracking and spalling.The possibility of alkali-aggregate reaction was excluded by field survey and lab examination such as X-ray diffractometry,petrographic analysis and determination of alkali reactivity of aggregates.Freeze-thaw cycles were identified to be the main cause for the damage of the runway shoulder,according to rapid freezing method.Microstructure of damaged concrete was examined by optical microscopy and mercury intrusion porosimetry（MIP） in order to explain the mechanism of the damage.New approaches to mitigate the damage of concrete used under severe environmental conditions were also discussed.
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