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1、第34卷第6期公路交通科技Vol.34No.62017年6月JournalofHighwayandTransportationResearchandDevelopmentJun.2017doi:10.3969/j.issn.1002-0268.2017.06.009水泥混凝土热应变及干缩应变的现场测试1,222户桂灵,韩文扬,余四新(1.长安大学公路学院,陕西西安710064;2.高速公路养护技术交通行业重点实验室(济南),山东济南250031)摘要:通过分析水泥混凝土的时间依赖变形原理和设计无应力圆筒,提出了一种温湿度耦合作用下水泥混凝土膨胀系数及干缩系数的测试方法,对干缩系
2、数进行了理论推导计算。在实际路面中采用此方法埋设相关设备并结合采集的典型数据进行分析。结果表明:此方法得到的水泥混凝土热应变和干缩应变真实可靠,通过数据处理可快速得到其热膨胀系数、线膨胀系数和干缩系数;对于试验段水泥混凝土,得出其热膨胀系数为9.006μm/℃,线膨胀系数为9.305μm/℃,干缩系数为657.7μm;同时,设计的无应力圆筒可以保证测试需要,无孔无应力圆筒内水泥混凝土只经历温度变化,有孔无应力圆筒同时经历温度和湿度作用,筒内外湿度交换良好。关键词:道路工程;水泥混凝土;测试方法;无应力圆筒;膨胀系数;干缩系数中图分类号:U414文献标识码:A文章编号:1002-
3、0268(2017)06-0061-06FieldTestofThermalStrainandDryShrinkageStrainofCementConcrete1,222HUGui-ling,HANWen-yang,YUSi-xin(1.SchoolofHighway,Chang’anUniversity,Xi’anShaanxi710064,China;2.KeyLaboratoryofExpresswayMaintenanceTechnologyofMinistryofTransport(Jinan),JinanShandong250031,China)Abstract:
4、Byanalyzingthetime-dependentdeformationprincipleofcementconcreteanddesigningaparticularnon-stresscylinder,amethodfortestingtheexpansioncoefficientanddryshrinkagecoefficientofcementconcretewiththecouplingeffectoftemperatureandhumidityisproposed,andthedryshrinkagecoefficientisderivedandcalcula
5、ted.Therelevantdeviceislaidintoactualroadbytheproposedmethod,andtypicaldataisgatheredandanalyzed.Theresultindicatesthat(1)themeasuredthermalstrainanddryshrinkagestrainobtainedbytheproposedmethodistrueandreliable,thethermalexpansioncoefficient,linearexpansioncoefficientanddryshrinkagecoeffici
6、entcanbeobtainedquicklyafterdataprocessing;(2)thethermalexpansioncoefficient,linearexpansioncoefficientanddryshrinkagecoefficientofthetestroadare9.006μm/℃,9.305μm/℃,657.7μmrespectively;(3)thedesignednon-stresscylindercanmeetthetestrequirement,thecementconcreteinimperviousnon-stresscylinderex
7、periencedonlytemperaturechange,whilethecementconcreteinporousnon-stresscylinderexperiencedbothtemperatureandhumiditychange,andthehumidityexchangeinsideandoutsidethecylinderisgood.Keywords:roadengineering;cementconcrete;testmethod;non-stresscylinder