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1、第30卷第6期2012年12月中國民航大學(xué)學(xué)報(bào)JOURNALOFCIVILAVIATl0NUNIVERSITYOFCHINAV01.30No.6Deeember2012多孔混凝土道面的溫度分布與凍融特點(diǎn)趙方冉,李亮,蔡子良(中國民航大學(xué)機(jī)場學(xué)院,天津300300)摘要:利用數(shù)值分析的方法.分析了普通混凝土道面和多孔混凝土道面在低溫環(huán)境下溫度傳遞的規(guī)律,并對(duì)多孔混凝土道面表層結(jié)構(gòu)在冬季凍融循環(huán)作用下的溫度傳遞過程與溫度場分布進(jìn)行了數(shù)值模擬?;诙嗫谆炷恋烂鏈囟葍?nèi)部熱傳遞對(duì)流一傳導(dǎo)復(fù)合方式的分析,建立了多孔混
2、凝土內(nèi)部溫度傳遞解析方程。以烏魯木齊機(jī)場道面冬期低溫月份的表層結(jié)構(gòu)溫度場變化規(guī)律為例,分析在采用多孔混凝土?xí)r的內(nèi)部溫度場分布規(guī)律。分析結(jié)果表明.多孔混凝土中對(duì)外連接孔直徑越大,或孔隙間距越小時(shí),其溫度傳遞速度就越快,混凝土受凍速度也越快,,利用四面體堆積結(jié)構(gòu)等效多孔混凝土內(nèi)部結(jié)構(gòu)的間接方式進(jìn)行了低溫凍融和強(qiáng)度實(shí)驗(yàn),并測試了堆積顆粒間點(diǎn)接觸的抗凍性能變化規(guī)律。實(shí)驗(yàn)結(jié)果表明,多孔混凝土中顆粒間點(diǎn)接觸強(qiáng)度隨凍融次數(shù)增多而降低.且在前30次凍融過程中降低更顯著,50次凍融循環(huán)后的強(qiáng)度降低可迭50%。關(guān)鍵詞:多孔混凝
3、土:熱傳遞;溫度分布;抗凍融性能中圖分類號(hào):TU528.0;V351.11文獻(xiàn)標(biāo)志碼:A文章編號(hào):1674—5590(2012)06—0083—07Temperaturedistributionsandfreezing——thawingpropertiesofporousconcretepavementZHA0F6m,g—ran,LILiang,CAlZi—liang(AirportCollege,CAUC,Tianjin300300,China)Abstract:Thetemperaturetransfm
4、‘ruleintheordinaryconcreteandporousconcretepavementunderlowtemperatureconditionhavebeenanalyzedbynleansofnumericalanalysis,thetemperaturetransferandthedistributionoftemperaturefieldinporousconcretepavementunderthewinterfreeze—thawcyclesactionhavebeensimula
5、ted.ThetemperaturetransferanalyticequationsoftheporousconcretehavebeenestablishedbasedOiltheanalysisofcompositewayoftheheattransferconvection—conductioninsidetheporousconcrete.Thedistributionruleoftemperaturefieldinporousconcretepavementisanalyzed,simulati
6、ngtheporousconcretepavementofWULUMUQIairportunderlowtemperatureincoldestmonth.Theanalysisresultindicatesthatthebaggeroftheconnectedpore,orthesmallerforthespansfromporesintheporousconcrete,thefasterofthetemperaturetransmissionspeed,andmorequickerofthespeedo
7、ffreezing.Freeze—thawandcompressiveexperimentshavebeenconductedusingthetetrahedronparticlesmodetosimulatetheinternalporousconcrete,andthefreezing~thawingresistancerulesofcontactedparticlesinthetetrahedronhavebeentested.Testingresultsshowsthatthecontactedst
8、rengthoftheparticlesdecreaseswiththeincreasesoffreeze—thawcycles,andthereductionofthestrengthissignificantlyintheinitial30cycles,andthestrengthwouldbeenreducednearlyhalfafter50cycles.Keywords:porousconcrete;t