沥青混合料高温性能剪切破坏模量研究

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1、摘要车辙是沥青路面的主要病害形式，采用何种试验方法及指标能更有效的评价沥青混合料的高温性能已成为亟需解决的问题。本文在分析各种试验方法及评价指标的基础上，提出采用等速率轴向局部加载试验得到的剪切破坏模量指标来评价沥青混合料高温性能。针对影响沥青混合料高温性能的内在因素，本文主要从混合料的级配、油石比、沥青类型、空隙率等方面分析了剪切破坏模量指标的变化规律。在此基础上进行了车辙试验，通过车辙试验结果与等速率轴向局部加载试验结果的对比分析，认为，剪切破坏模量与车辙动稳定度指标有着较好的相关性。剪切破坏模量作为评价沥青混合料高温性能的力学指标是可行的。介绍了影响剪切破坏模量因素的评价方

2、法。通过计算沥青混合料马歇尔体积参数的灰关联度，认为，空隙率、饱和度对剪切破坏模量的影响较大，并在此基础上建立了模量的预估模型。方差和残差回归分析结果表明，该模型可以有效地评价沥青混合料高温性能。汇总全文的研究成果认为，剪切破坏模量作为评价高温性能的力学指标对指导沥青混合料设计及性能预测有重要的现实意义。关键词：沥青混合料、高温性能、轴向局部加载试验、车辙试验、剪切破坏模量AbstractRuttinghasbecomethefirstoneoftheasphaltpavementdamagephenomenon．Wemusttaketheappropriatetestmetho

3、dsandevaluationindexesasthemostexigentproblemtosolve．Thispaperproposeusingtheshearfailuremodelwhichwecanreceivefromtheseemspeedaxialpartialloadingteststoevaluatethehi．ghtemperatureperformanceofasphaltpavementonthebasisofanalyzingallkindsoftestmethodsandevaluatingindexs．Againsttheinfluencingfa

4、ctorsofasphaltmixtures，thepapermainlyanalysisthechangesoftheshearfailuremodulefromtheasphaltmixturepercentageofvoidvariety,theratioasphaltanddifferentgradationanddifferentkindsofasphaltrespects．Thencardedontheruttingtests，throughanalyzingtheresultofruttingtestandtheseemspeedaxialpartialloadin

5、gtests，weconsiderthatthereexistsgoodrelevancebetweentheshearfailureindexmoduleandrutdynamicstability．Theshearfailuremoduleissuitabletoevaluatethehightemperatureperformanceofasphaltpavement．IntroducedtheevaluatingmethodsofinfluencemodulefactorsGreycorrelmionanalysisindicatesthatvolumeofairvoid

6、sandpercentofthevoidsinmineralaggregateisthemostimportantfactorformodule．Onthebasisofanalyticalresultestablishtheshearfailuremoduleestimatingmold．ResidualvarianceandregressionanalysisresultsshowthatthemoduleCaneffectivelyevaluatethehightemperatureperformanceofasphaltpavement．Collectingtherese

7、archfinding，asthemechanicalindex，itisverysignificanttoapplyshearfailuremoduledirectingthedesignofthehotmixasphaltandpredictingperformance．Keywords：hotasphaltmixture；hightemperatureperformance；seemspeedaxialpartialloadingtests；ruttingtest；shea