欢迎来到天天文库
浏览记录
ID:52220653
大小:1.24 MB
页数:5页
时间:2020-03-25
《温度-盐分-冻融耦合作用下沥青混凝土疲劳寿命研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第31卷第8期2014年8月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentVol_3lNo.8Aug.2014doi:10.3969/j.issn.1002—0268.2014.08.0060日I皿度一盐分一冻融耦合作用下沥青混凝土疲劳寿命研究吴金荣,马芹永,王文娟(安徽理工大学土木建筑学院,安徽淮南232001)摘要:为提高寒冷地区沥青路面的疲劳性能,对Ac一16型沥青混凝土进行未冻融和冻融条件下的劈裂疲劳试验,得到了其应力疲劳方程。研究了温度、盐分和冻融循
2、环次数耦合作用下,沥青混凝土疲劳寿命的变化规律。研究结果表明:沥青混凝土的疲劳寿命与其劈裂抗拉强度具有明显的相关性,即劈裂抗拉强度越高,疲劳寿命越大。温度、冻融循环和氯盐的侵蚀是影响沥青混凝土疲劳性能的重要因素。在相同的冻融循环温度下,随着冻融循环次数的增加,沥青混凝土疲劳寿命降低;在相同的冻融次数下,随着冻融温度的降低,沥青混凝土疲劳寿命降低。经饱和氯盐溶液冻融的沥青混凝土疲劳寿命明显低于经清水冻融的沥青混凝土疲劳寿命,说明盐分能够加剧沥青混凝土的疲劳破坏。关键词:道路工程;沥青混凝土;疲劳寿命;温度;氨盐腐蚀;冻融循环;劈裂疲劳试
3、验中图分类号:U416.217文献标识码:A文章编号:1002—0268(2014)08—0030—05ResearchonFatigueLifeofAsphaltConcreteunderCouplingActionofTemperature,SaltandFreeze—thawWUJin-rong,MAQin—yong,WANGWen-juan(SchoolofCivilEngineeringandArchitecture,AnhuiUniversityofScienceandTechnology,HuainanAnhui2320
4、01,China)Abstract:Inordertoimprovethefatigueperformanceofasphaltpavementincoldregion,thesplitfatiguetestsofAC一16asphaltconcreteundertheconditionsofwithorwithoutfreeze-thawarecarriedout,andthecorrespondingstressfatigueequationsareobtained.Thechangeregularityoffatiguelife
5、ofasphaltconcreteunderthecouplingactionoftemperature,saltandfreeze—thawcyclesisstudied.Theresultsindicatethat(1)thereisaclearcorrelationbetweenfatiguelifeandsplittensilestrengthofasphaltconcrete,i.e.,thehigherthesplittensilestrengthis,thelongerthefatiguelifeis;(2)temper
6、ature,freeze—thawcyclesandthecorrosionofchlorinesaltaretheimportantfactorswhichaffectthefatigueperformanceofasphaltconcrete;(3)whenfreeze—thawtemperatureisthesame,thefatiguelifeofasphaltconcretedecreasesasthefreeze-thawcyclesincreasing;(4)whenthefreeze—thawcyclesarecert
7、ain,thefatiguelifeofasphaltconcretedecreasesasthefreeze-thawtemperaturereducing;(5)thefatiguelifeofasphaltconcreteafterfreezingandthawinginsaturatedchlorinesaltsolutionisobviouslylowerthanthatinwater,whichshowsthatchlorinesaltcanacceleratethefatiguefailureofasphaltconcr
8、ete.Keywords:roadengineering;asphaltconcrete;fatiguelife;temperature;chlorinesaltcorrosion;freeze—thawcycle;sp
此文档下载收益归作者所有