資源描述:
《多孔混凝土道面的溫度分布與凍融特點》由會員上傳分享,免費在線閱讀,更多相關內容在學術論文-天天文庫。
1、第30卷第6期2012年12月中國民航大學學報JOURNALOFCIVILAVIATl0NUNIVERSITYOFCHINAV01.30No.6Deeember2012多孔混凝土道面的溫度分布與凍融特點趙方冉,李亮,蔡子良(中國民航大學機場學院,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,并對多孔混凝土道面表層結構在冬季凍融循環(huán)作用下的溫度傳遞過程與溫度場分布進行了數(shù)值模擬?;诙嗫谆炷恋烂鏈囟葍炔繜醾鬟f對流一傳導復合方式的分析,建立了多孔混
2、凝土內部溫度傳遞解析方程。以烏魯木齊機場道面冬期低溫月份的表層結構溫度場變化規(guī)律為例,分析在采用多孔混凝土時的內部溫度場分布規(guī)律。分析結果表明.多孔混凝土中對外連接孔直徑越大,或孔隙間距越小時,其溫度傳遞速度就越快,混凝土受凍速度也越快,,利用四面體堆積結構等效多孔混凝土內部結構的間接方式進行了低溫凍融和強度實驗,并測試了堆積顆粒間點接觸的抗凍性能變化規(guī)律。實驗結果表明,多孔混凝土中顆粒間點接觸強度隨凍融次數(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)后的強度降低可迭50%。關鍵詞:多孔混凝
3、土:熱傳遞;溫度分布;抗凍融性能中圖分類號:TU528.0;V351.11文獻標志碼:A文章編號: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