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时间:2019-02-04
《高速铁路板式无砟轨道充填层混凝土收缩变形特性研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、学兔兔www.xuetutu.com2011年第3期(总第257期)混凝土实用技术Number3in2011(TotalNo.257)ConcretePRACTICALTECHNOL0GYdoi:10.39690.issn.1002—3550.2011.03.040高速铁路板式无砟轨道充填层混凝土收缩变形特性研究谭盐宾。,赵健。,李化建1,2,谢永江1I2,易忠来1,2(1.中国铁道科学研究院,北京100081;2.高速铁路轨道技术国家重点实验室,北京1000813.西南交通大学土木工程学院,四川成都610031)摘要:为探明高速
2、铁路板式无砟轨道充填层混凝土的收缩变形规律,开展了充填层混凝土收缩变形影响因素试验研究。结果表明:早期保湿养护对降低充填层混凝土干缩变形作用明显,比未进行保湿养护自密实混凝土的干缩变形降低15%左右;细骨料细度模数对充填层混凝土干缩变形影响较小;粗骨料最大粒径对充填层混凝土自身收缩变形的影响比干燥收缩大,粗骨料最大粒径由20mm降低至10mm,自身收缩变形值增大5%-25%;胶凝材料用量对充填层混凝土干缩变形和自身收缩变形影响显著,胶凝材料用量每增加2O,混凝土干缩变形值和自身收缩变形值均增大10%~20%;充填层混凝土早期(90
3、d)自身收缩变形占干缩变形的50%,而长期(210d)则能占干缩变形总量的74%左右。关键词:高速铁路;充填层混凝土;干缩变形;自身收缩变形中图分类号:TU528.01文献标志码:A文章编号:1002—3550(2011)03—0125—04ResearchonpropertyofdeformationoffillinglayerconcreteusedinhighspeedrailwayslabballastlesstrackTANYan—bin‘一,ZHAOJian,LIHun-jian,XIEYong-jiang一,YIZh
4、ong-lai(1.ChinaAcademyofRailwayScience,Beijing100081,China;2.StateKeyLaboratoryforTrackTechnologyofHigh-SpeedRailwayBeijing100081,China;3.SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China)Abstract:Touncoverthepropertyofdeformationoffillinglayerc
5、oncreteusedinhighspeedrailwayslabballastlesstrack,thefactorswhichaf-fectthedeformationoffillinglayerconcretewerestudied.Theresultsshowthatearlycuringcanreducethedrying—shrinkageofconcreteobvious—ly.thedrying-shrinkagevalueofconcretewithearlycuringis15%lowerthanthatwit
6、houtearlycuring.Finenessmodulusofsandhasaslightlyef-feetondrying-shrinkageofconcrete.Theinfluenceofmaximumsizeofaggregateonautogeneousshrinkageishigherthandrying-shrinkage.Theautogeneousshrinkagevalueincreased5%tO25%whenthemaximumsizeofaggregatereducedfrom20mmto10mm.T
7、hecontentofbindingmaterialalsohadanobviouseffectonbothdrying—shrinkageandautogeneousshrinkage.Boththevaluesofdrying-shrinkageandautogeneousshrinkageincreased10%to20%whenthecontentofbindingmaterialincreased20kg.Theautogeneousshrinkagevaluecanbe50%ofdry-ing—shrinkageval
8、ueatearlyage(90d),andcanreach74%ofdrying—shrinkagevalueatlongage(210d).Keywords:highspeedrailway;fillinglayerconcrete;drying
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