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1、有機(jī)飛機(jī)除冰液作用下普通混凝土的抗凍性微觀機(jī)理分析馬好霞余紅發(fā)李創(chuàng)曹文濤南京航空航天大學(xué)航空宇航學(xué)院南京航空航天大學(xué)金城學(xué)院北京古城房地產(chǎn)開(kāi)發(fā)有限公司江蘇省交通科學(xué)研究院股份有限公司摘要:結(jié)合現(xiàn)有的凍融破壞理論,研究了以乙二醇為主要成份的飛機(jī)除冰液作用下普通混凝土凍融損傷失效規(guī)律與特點(diǎn)?采用X射線衍射儀、掃描電子顯微鏡和X射線能量色散譜儀,進(jìn)行試件凍融后的物相組成、微觀結(jié)構(gòu)變化以及微區(qū)元素分析.實(shí)驗(yàn)結(jié)果表明:低質(zhì)量分?jǐn)?shù)乙二醇對(duì)混凝土抗凍剝蝕性比水嚴(yán)重,高質(zhì)量分?jǐn)?shù)乙二醇對(duì)混凝土的凍融破壞比水輕微?飛機(jī)除冰液質(zhì)量分?jǐn)?shù)越低,對(duì)混凝土的凍融破壞作用越嚴(yán)重;
2、低質(zhì)量分?jǐn)?shù)乙二醇對(duì)普通混凝上的凍融破壞以表面剝落破壞為主,質(zhì)量損失首先達(dá)到破壞標(biāo)準(zhǔn)?高質(zhì)量分?jǐn)?shù)乙二醇對(duì)普通混凝土的凍融破壞以相對(duì)動(dòng)彈性模量首先達(dá)到破壞標(biāo)準(zhǔn),主要表現(xiàn)為端部的嚴(yán)重凍疏?在乙二醇飛機(jī)除冰液凍融過(guò)程中普通混凝土內(nèi)沒(méi)有新物質(zhì)生成,水化硅酸鈣凝膠與氫氧化鈣晶體未發(fā)牛變化.普通混凝土在乙二醇飛機(jī)除冰液中的凍融破壞機(jī)理與水中一樣,以結(jié)冰壓破壞為主.關(guān)鍵詞:飛機(jī)除冰液;普通混凝土;凍融破壞;結(jié)冰壓;微觀分析;作者簡(jiǎn)介:馬好霞(1985-),女,山東濰坊人,南京航空航天大學(xué)博士研究生作者簡(jiǎn)介:余紅發(fā),E-mail:yuhongfa@nuaa.edu.
3、cn收稿日期:2016-09-07基金:國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)資助項(xiàng)冃(2015CB655100)MicroscopicMechanismAnalysisonFrostResistanceofOrdinaryConcreteunderEthyleneGlycolTypeAircraftDe-icerMAHaoxiaYUHongfaLIChuangCAOWentaoSchoolofAeronauticsandAstrorrnutics,NanjingUniversityofAeronauticsandAstroneutics;Beij
4、ingAncientCityRealEstateDevelopmentCo,Ltd;JiangsuTransportationResearchInstituteCo,Ltd;Abstract:Onthebasisoffreeze-thawdamagetheories,thefreeze-thrawdamagepatternandfeatureofordinaryPortlandconCrete(OPC)werestudiedundertheaircraftde-icerwithethyleneglycol.Themicrophasecomposit
5、ionsofspecimenswereanalyzedbyX-raydiffractomctcr,microstrueturcwasobservedbyscanningelectronmicroscopyandMicroareaelementwasanalyzedbyenergydispersionX-ray.Themainresultswereremarkedasfollows:ThefrostresistanceofconcreteundertheactionoflowerconcentrationofEGwasmoreseriousthant
6、hatofwater,whilethefreezingandthawingdamageinhigherconcentrationofcthyleneglycolwasslightlylowerthanthatofwater.Thelowerconcentrationofaircraftdeicingfluidresultsinmoreseriousdamagetotheconcrete.Thefreeze-thawdamageofOPCwithlowconcentrationofethyleneglycolwasmainlythesurfacesp
7、allingfailure,andthemasslossreachedthestandardoffailurefirstly.However,whenimmersedinhighconcentrationofethylencglycol,thefreeze-thawdamageofOPCwasthattherelativedynamicelasticmodulusfirstcameuptothefailurestand,whichwasmainlyembodiedinseverespal1ingattheends.Inawhole,thefreez
8、ingandthawingdamagewasciphysicaldamagemechanism.Nonewsubstanc