机场道面除冰液作用下大掺量粉煤灰混凝土的抗冻性

发布时间：2019-05-30 03:54

【摘要】：通过大掺量粉煤灰混凝土(HFCC)试件在质量分数为3.5%,12.5%,25%机场道面除冰液(CMA溶液)、质量分数为3.5%的NaCl溶液、质量分数为3.5%的飞机除冰液(AD溶液)、质量分数为25%的商品飞机除冰液与水中快速冻融试验,获得了冻融过程中HFCC的质量损失率和相对弹性模量的变化规律。结果表明:在质量分数为3.5%的介质中,HFCC在NaCl溶液中的冻融破坏以表面剥落为主,在AD,CMA溶液中以内部冻融损伤为主;与水中冻融条件相比,质量分数为3.5%的CMA溶液延缓了HFCC的冻融破坏作用;HFCC在CMA溶液作用下的冻融破坏与其质量分数密切相关,CMA溶液质量分数越高,HFCC的冻融破坏作用越小,当CMA溶液的质量分数在12.5%以上时,即使经受600次快速冻融循环,其质量损失率和相对动弹性模量损失均很小;在质量分数为25%的冻融介质中,HFCC在商品飞机除冰液中的抗冻性较差,在机场道面除冰液中抗冻性较好;HFCC完全能够应用于较高质量分数CMA溶液进行冬季除冰雪作业的水泥混凝土机场跑道。
[Abstract]:Through the mass fraction of 3.5%, 12.5%, 25% CMA solution and 3.5% NaCl solution, the mass fraction of (HFCC) specimen is 3.5%, 12.5%, 25%, 3.5%, 3.5%, 3.5%, 3.5%, 3.5%, 3.5%, 3.5%, 3.5%, 3.5%, 3.5%, 3.5% and 3.5%, respectively. The mass loss rate and relative elastic modulus of HFCC during freeze-thaw process were obtained by rapid freeze-thaw test of aircraft deicing solution (AD solution) with mass fraction of 3.5% and commercial aircraft deicing solution with mass fraction of 25%. The results show that in the medium with 3.5% mass fraction, the freeze-thaw damage of HFCC in NaCl solution is mainly surface spalling, and in AD,CMA solution, internal freeze-thaw damage is the main cause of freeze-thaw damage. Compared with the freeze-thaw condition in water, 3.5% CMA solution delayed the freeze-thaw damage of HFCC. The freeze-thaw failure of HFCC under the action of CMA solution is closely related to its mass fraction. The higher the mass fraction of CMA solution is, the smaller the freeze-thaw damage effect of HFCC is. When the mass fraction of CMA solution is more than 12.5%, even after 600 rapid freeze-thaw cycles, The mass loss rate and relative dynamic elastic modulus loss are very small. In the freeze-thaw medium with a mass fraction of 25%, the frost resistance of HFCC in the deicing liquid of commercial aircraft is poor, and the frost resistance is better in the deicing liquid of the airport pavement. HFCC can be used in cement concrete airport runway with high mass fraction CMA solution for snow removal in winter.
【作者单位】：南京航空航天大学土木工程系;济南城建设计研究院有限责任公司;
【基金】：国家重点基础研究发展计划(“九七三”计划)项目(2009CB623203) 国家自然科学基金项目(51178221,21276264)
【分类号】：U414

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