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时间:2020-06-06
《温拌再生沥青混合料耐久性能.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第27卷第8期中国公路学报Vo1.27NO.82014年8月ChinaJournalofHighwayandTransportAug.2014文章编号:1001—7372(2014)08—0017-06日lⅡA拌再生沥青混合料耐久性能郭乃胜,尤占平,赵颖华,谭忆秋。(1.大连海事大学道路与桥梁工程研究所,辽宁大连116026;2.密歇根理工大学土木与环境工程系,密歇根霍顿M149931;3.哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090)摘要:为了使温拌再生沥青混合料(wRAM)在路面中更好地得以应用,采用老化
2、试验、冻融循环劈裂试验和疲劳试验研究添加2种化学温拌剂的wRAM及热再生沥青混合料(HRAM)的耐久性能,并在老化试验中分别考虑短期及长期老化2种工况,评价老化后混合料的水稳定性能和低温抗裂性能。研究结果表明:短期老化后WRAM的抗拉强度比(Ts)较未老化时增加,而长期老化后WRAM的TsR值显著降低;与未老化WRAM相比,短期及长期老化后WRAM的最大弯曲拉应变均降低;随着冻融循环次数的增加,WRAM的TR值总体呈下降趋势,但经受冻融循环3次后WRAM的T值急剧提高,冻融循环5次后WRAM的R值迅速降低;WRAM和HRA
3、M的疲劳寿命对应力比变化的敏感性相近;添加2种温拌剂的WRAM耐久性能存在差异,但均优于HRAM。关键词:道路工程;再生沥青混合料;老化试验;耐久性能;冻融循环;疲劳中图分类号:U414.1文献标志码:ADurabilityofWarmMixAsphaltContainingRecycledAsphaltMixturesGUONai—sheng,YoUZhan—ping,ZHAOYing—hua,TANYi—qiu。(1.InstituteofRoadandBridgeEngineering,DalianMaritimeU
4、niversity,Dalian116026,Liaoning,China;2.DepartmentofCivilandEnvironmentalEngineering,MichiganTechnologicalUniversity,HoughtonMI49931,Michigan,USA;3.SchoolofTransportationScienceandEngineering,HarbinInstituteofTechnology,Harbin150090,Heilongjiang,China)Abstract:Top
5、otentiallyemploywarmmixasphaltcontainingrecycledasphaltmixture(WRAM)inpavement,agingtests,freeze—thawcyclesplittingtests,andfatiguetestswereconductedtoinvestigatethedurabilitiesofWRAMproducedusingtwochemicalwarmmixadditivesandthehotmixasphaltcontainingrecycledasph
6、altmixture(HRAM).Bothshort—termandlong—termagingweretakenintoaccountintheagingtests.Waterstabilityandlowtemperaturecrackingresistanceofagedmixtureswereevaluated.TheresultsshowthatWRAMsufferingfromtheshort—termagingexhibitsaslightincreaseinthetensilestrengthratio(T
7、sR),comparedwiththeunagedWRAM,whereasthelong—termagingresultsinadistinctreductionintheTsR.MaximumbendtensilestrainsoftheWRAMaftershort—termandlong—termagingexhibitmuchmoredecreasethanthatoftheunagedWRAM.TheTsRoftheWRAMgenerallydecreaseswiththeincreaseoffreeze—thaw
8、cycles,however,theTsRdisplaysanobviousincreaseafterthreefreeze—thawcycles.Afterfivefreeze—thawcycles,theWRAMexhibitsaremarkabledecreaseintheTsR.收稿日期:201
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