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1、第32卷第4期公路交通科技VoL32No．42015年4月JournalofHighwayandTransportationResearchandDevelopmentApr．2015doi：10．．3969／j．issn．1002—0268．2015．04．001老化瀝青混合料的松弛模量模型田小革，劉良駿，于發(fā)袂，何林(長(zhǎng)沙理工大學(xué)交通運(yùn)輸工程學(xué)院，湖南長(zhǎng)沙410004)摘要：通過(guò)對(duì)瀝青混合料．AC一13C進(jìn)行5種不同程度老化，然后再進(jìn)行一5℃條件下的應(yīng)力松弛試驗(yàn)，研究老化對(duì)其應(yīng)力松弛性能的影響并建立耦合老化程度因子的松弛模量模型。對(duì)比不同老化程度瀝青混合料的松弛模量曲
2、線(xiàn)，發(fā)現(xiàn)老化程度與松弛時(shí)間之間存在一定的等效性；基于材料黏度的自由體積理論，通過(guò)假設(shè)瀝青混合料的自由體積分?jǐn)?shù)與老化程度間呈線(xiàn)性關(guān)系，研究并建立了瀝青混合料的老化程度一松弛時(shí)間等效移位因子；對(duì)松弛模量主曲線(xiàn)分別采用Burgers模型和不同單元數(shù)目的廣義Maxwell模型進(jìn)行非線(xiàn)性擬合，表明廣義Maxwell模型在表征松弛模量變化時(shí)優(yōu)于Burgers模型，且單元數(shù)越多，擬合精度越高，考慮到擬合精度和參數(shù)數(shù)目，推薦采用六單元廣義Maxwell模型，并建立耦合老化程度因子的松弛模量模型。關(guān)鍵詞：道路工程；瀝青混合料；試驗(yàn)；松弛模量；應(yīng)力松弛；老化；移位因子；廣義Maxwell模型
3、；Burgers模型中圖分類(lèi)號(hào)：U414文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002—0268(2015)04—0001—06RelaxationModulusModelofAgedAsphaltMixtureTIANXiao—ge，LIULiang-jun，YUFa-mei，HELin(SchoolofTraffic＆TransportationEngineering，ChangshaUniversityofScience&Technology，ChangshaHunan410004，China)Abstract：ByagingofasphaltmixtureAC—-13Cfor5
4、degreesandthenconductingstressrelaxationtestontheagedsamplesat-5oC，theeffectofagingonthestressrelaxationoftheasphaltmixturesisresearchedandtherelaxationmodulusmodelofasphaltmixturescoupledwithagingfactorisestablished．Thecomparisonofrelaxationmoduluscurver8ofasphalt，mixtureswithdifferentag
5、ingdegreesshowsthatthereexiststheequivalencebetweenagingdegreeandrelaxationtime．Theequivalentshiftfactorbetweena西ngdegreeandrelaxationtimeofasphaltmixtureisfoundedbasedonthefreevolumetheoryofmaterialviscositythroughhypothesizingthatthereexistsalinearrelationshipbetweenfractionalfreevolume
6、andagingdegree．Non-linearfittingontheobtainedrelaxationmodul、usmastercurveisconductedusingBurgersmodelandthegeneralMaxwellmodelwithdifferentelementsrespectively，whichshowsthatthegeneralMaxwellmodelissuperortotheBurgersmodelinexpressingthechangeofrelaxationmodulus，andthefittingprecisioninc
7、reaseswiththeincreaseofnumberoftheelements．Accordingtothefittingprecisionandthenumberofelements，the6-elementgeneralMaxwellmodelisrecommended，thentherelaxationmodulusmodelofasphaltmixturecoupledwithagingfactoriSestablished．Keywords：roadengineering；asphaltmixture；test
