CAJ | 학술논문

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H FCC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，H FCC 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。
통과대참량분매회혼응토（HFCC）시건재질량분수위3．5％，12．5％，25％궤장도면제빙액（CMA용액）、질량분수위3．5％적NaCl용액、질량분수위3．5％적비궤제빙액（AD용액）、질량분수위25％적상품비궤제빙액여수중쾌속동융시험，획득료동융과정중H FCC적질량손실솔화상대탄성모량적변화규률。결과표명：재질량분수위3．5％적개질중，HFCC 재NaCl 용액중적동융파배이표면박락위주，재AD，CMA용액중이내부동융손상위주；여수중동융조건상비，질량분수위3．5％적CMA용액연완료HFCC적동융파배작용；HFCC재CMA용액작용하적동융파배여기질량분수밀절상관，CMA용액질량분수월고，HFCC적동융파배작용월소，당CMA용액적질량분수재12．5％이상시，즉사경수600차쾌속동융순배，기질량손실솔화상대동탄성모량손실균흔소；재질량분수위25％적동융개질중，H FCC 재상품비궤제빙액중적항동성교차，재궤장도면제빙액중항동성교호；HFCC완전능구응용우교고질량분수CMA 용액진행동계제빙설작업적수니혼응토궤장포도。
The freeze-thaw durability of high volume fly ash content concrete (HFCC)specimens were tested by fast freezing-thawing experiments.In the experiments,HFCC specimens exposed to different solutions which were composed of airfield pavement deicer,NaCl solution,aircraft deicer (AD),commercial deicer and water.The airfield pavement deicer mainly contained calcium magnesium acetate (CMA)and was changed at mass fractions of 3.5%,12.5% and 25%.The mass fractions of NaCl solution,aircraft deicer and commercial deicer were 3 .5%,3 .5% and 25%,respectively.Through the experiments,the change rules of the mass loss rate per unit area and the relative dynamic elastic modulus of HFCC were obtained.The results show that freeze-thaw damage of HFCC exposed to 3 .5% NaCl solution is closely attributed to surface deterioration.When HFCC specimens exposed to 3 .5% AD or 3 .5% CMA solution,it will be damaged by internal freeze-thaw damage.Compared with water,freeze-thaw damage effect of HFCC is delayed by 3 .5% CMA solution.Freeze-thaw durability of concrete exposed to CMA solutions is closely related to the solution mass fractions,the higher the CMA mass fraction is,the smaller the freeze-thaw damage effects are.When the CMA mass fraction is greater than 12.5%, the mass loss rate and the relative dynamic elastic modulus losses are small after 600 times fast freeze-thaw cycle.HFCC has a poor freeze-thaw durability when exposed to 25% commercial deicer and has a good freeze-thaw durability when exposed to 25% airfield pavement deicer. Therefore,HFCC can be completely applied to the cement concrete airfield runway which is deiced by high mass fractions of CMA.