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1、第34卷第4期公路交通科技Vol.34No.42017年4月JournalofHighwayandTransportationResearchandDevelopmentApr.2017doi:10.3969/j.issn.1002-0268.2017.04.004盐渍土地区道面混凝土盐冻侵蚀研究11123谢宇晨,翁兴中,张俊,万希存,高倩(1.空军工程大学航空航天工程学院,陕西西安710038;2.空军北京设计室,北京100022;3.江苏海事职业技术学院,江苏南京210000)摘要:为了研究盐渍土地区道面混凝土的盐冻侵蚀规律,对盐渍土地区机场道面典型的破坏状
2、况进行了调查。发现典型破坏形态有强度损失、表面剥蚀、黑斑等,其原因是面层混凝土受到了盐的侵蚀。为了研究其破坏机理,在此基础上进行了盐冻试验。结果表明:在相同冻融循环次数作用下,随着硫酸盐浓度的提高,混凝土的强度和动弹模量下降速度加快;在相同硫酸盐浓度中,随着冻融循环次数增加,混凝土的破坏程度加深,冻融100次时,混凝土弯拉强度下降值和动弹模量下降值分别达到55%和60%,发生严重破坏;提高混凝土强度对道面混凝土耐盐冻作用改善不明显。因此不建议采用提高混凝土强度等高成本措施来实现混凝土道面板盐冻侵蚀防治,根据相关工程经验提出了设置隔断层的方法,以便于工程应用。关键
3、词:道路工程;混凝土道面;盐冻试验;混凝土盐冻侵蚀;盐渍土中图分类号:U416.2文献标识码:A文章编号:1002-0268(2017)04-0025-07StudyonSalt-frostErosionofPavementConcreteinSaltySoilArea11123XIEYu-chen,WENGXing-zhong,ZHANGJun,WANXi-cun,GAOQian(1.SchoolofAeronauticalandAstronauticalEngineering,AirForceEngineeringUniversity,Xi’anShaanx
4、i710038,China;2.AirForceDesignInstituteofBeijing,Beijing100022,China;3.JiangsuMaritimeInstitute,NanjingJiangsu210000,China)Abstract:Inordertoexplorethesalt-frosterosionruleofpavementconcreteinsaltysoilarea,aninvestigationonthetypicaldamageconditionsofairportpavementinsaltysoilareaisc
5、arriedout.Itshowsthatthetypicalfailurecharacteristicsincludestrengthreduction,concretesurfaceerosion,blackspotandsoon.Thereasonisthattheconcretepavementhasbeenerodedbysalt.Asaltfreezingexperimentiscarriedouttofigureoutthemechanismofitsfailure.Theresultshowsthat(1)Underthesamenumberof
6、freezing-thawingcycles,withtheincreaseofsulfateconcentration,thedecreasespeedsofconcretestrengthanddynamicelasticmodulusareaccelerated.(2)Thebreakagedegreeofconcreteisdeepenedwiththeincreaseofnumberoffreezing-thawingcyclesinthesamesulfateconcentration.Whenthenumberoffreezing-thawingc
7、yclesis100,thedecreasevaluesofconcreteflexural-tensilestrengthanddynamicelasticmodulusreach55%and60%respectively,andheavydamagehappens.(3)Salttoleranceandfreezingtoleranceofconcretearenotimprovedobviouslybyincreasingconcretestrength.Therefore,high-costmeasureslikeincreaseofconcretest
8、rengtharenot