有机飞机除冰液作用下普通混凝土的抗冻性微观机理分析

发布时间：2018-05-02 09:35

本文选题：飞机除冰液 + 普通混凝土　；参考：《湖南大学学报(自然科学版)》2017年11期

【摘要】：结合现有的冻融破坏理论,研究了以乙二醇为主要成份的飞机除冰液作用下普通混凝土冻融损伤失效规律与特点.采用X射线衍射仪、扫描电子显微镜和X射线能量色散谱仪,进行试件冻融后的物相组成、微观结构变化以及微区元素分析.实验结果表明:低质量分数乙二醇对混凝土抗冻剥蚀性比水严重,高质量分数乙二醇对混凝土的冻融破坏比水轻微.飞机除冰液质量分数越低,对混凝土的冻融破坏作用越严重;低质量分数乙二醇对普通混凝土的冻融破坏以表面剥落破坏为主,质量损失首先达到破坏标准.高质量分数乙二醇对普通混凝土的冻融破坏以相对动弹性模量首先达到破坏标准,主要表现为端部的严重冻疏.在乙二醇飞机除冰液冻融过程中普通混凝土内没有新物质生成,水化硅酸钙凝胶与氢氧化钙晶体未发生变化.普通混凝土在乙二醇飞机除冰液中的冻融破坏机理与水中一样,以结冰压破坏为主.
[Abstract]:Combined with the existing freeze-thaw failure theory, the failure law and characteristics of freeze-thaw damage of ordinary concrete under the action of aircraft deicing liquid with ethylene glycol as the main component are studied. X-ray diffractometer, scanning electron microscope and X-ray energy dispersive spectrometer were used to analyze the phase composition, microstructure and microelements of the samples after freezing and thawing. The experimental results show that the low mass fraction ethylene glycol is more serious than water in frost and denudation, and the freeze-thaw damage of high mass fraction ethylene glycol is less than that of water. The lower the mass fraction of the aircraft deicing fluid, the more serious the freeze-thaw failure of concrete, and the more serious the freeze-thaw failure of ordinary concrete caused by low mass fraction ethylene glycol is the surface spalling failure, and the mass loss first reaches the damage standard. The freezing and thawing failure of ordinary concrete caused by high mass fraction ethylene glycol first reaches the failure standard with the relative dynamic elastic modulus, which is mainly shown as the severe freezing and thinning at the end of the concrete. In the freeze-thaw process of ethylene glycol aircraft deicing fluid, there is no new substance formed in ordinary concrete, and the hydrated calcium silicate gel and calcium hydroxide crystal do not change. The freezing and thawing failure mechanism of ordinary concrete in ethylene glycol aircraft deice is the same as that in water.
【作者单位】：南京航空航天大学航空宇航学院;南京航空航天大学金城学院;北京古城房地产开发有限公司;江苏省交通科学研究院股份有限公司;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2015CB655100) 国家自然科学基金资助项目(51178221,21276264,51308304) 高性能土木工程材料国家重点实验室重点基金项目(2015CEM001)~~
【分类号】：TU528

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