聚苯乙烯混凝土动态劈裂实验

胡俊; 巫绪涛

doi:10.11883/1001-1455(2011)04-0402-05

聚苯乙烯混凝土动态劈裂实验

doi: 10.11883/1001-1455(2011)04-0402-05

胡俊,
巫绪涛

1.
安徽建筑工业学院土木工程学院,安徽合肥230601;
2.
合肥工业大学土木与水利工程学院,安徽合肥230009

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出版历程
- 刊出日期: 2011-07-25

Dynamicsplittingtestofexpandedpolystyrene(EPS)concrete

HU Jun,
WU Xu-tao

1.
CivilEngineeringSchool,AnhuiUniversityofArchitecture,Hefei230601,Anhui,China;
2.
SchoolofCivilEngineering,HefeiUniversityofTechnology,Hefei230009,Anhui,China

More Information

Corresponding author: HU Jun

摘要

摘要: 利用直径为74mm 的分离式Hopkinson压杆径向冲击巴西圆盘试样,测试了不同聚苯乙烯(expandedpolystyrene, EPS)颗粒粒径、不同体积含量的EPS混凝土的动态拉伸性能。为了保证实验的可靠性, 在试样和入射杆、透射杆之间加上精确设计的垫块,防止试样两端因应力集中而被压碎破坏;通过选择合适的整形器,保证试样有足够的时间达到应力均匀。并分析了EPS混凝土劈裂破坏形态。实验结果表明:EPS混凝土的劈裂强度随应力率的增大而增大;在EPS体积含量较低的EPS混凝土中,EPS混凝土的劈裂强度表现出一定的粒子尺寸效应,随EPS颗粒体积含量的增加,这一现象逐渐消失。
- 固体力学 /
- 劈裂强度 /
- 分离式Hopkinson压杆 /
- EPS混凝土
Abstract: Toexplorethesplittingstrengthofexpandedpolystyrene(EPS)concretewiththedifferent volumeconcentrationsofEPS,Braziliandiscspecimenswerediametrallyimpactedbyusinga74-mmdiametersplitHopkinsonpressurebar( SHPB)atdifferentimpactvelocities.ForeachvolumeconcentrationofEPS, theBraziliandiscspecimensweretestedinthecasesoftwodifferentparticlesizes ofEPS,respectively.Andaccuratelydesignedcushionswereplacedintheinterspacesbetweentheinputandoutputbarsandthespecimenstopreventthespecimensfrombei gcrushedduetothestress concentrationatthetwoendsofthespecimens.Atthesametime,anappropriatepulseshaperwas usedtoensureenoughtimeforthespecimenstoreachanequilibriumstressstateduringtheexperiment. AndthesplittingfailurepatternsofEPSconcretewereanalyzed.Theresultsdisplaythatthe splittingstrengthofEPSconcreteincreaseswiththeincreaseofstressrate;andthatintheEPSconcretewiththelowvolumeconcentrationofEPS, thesplittingstrengthofEPSconcretetakesonacertainparticlesizeeffect, andthiseffectdisappearsgraduallywiththeincreaseoftheEPSvolumeconcentration.
- solidmechanics /
- splittingstrength /
- spiltHopkinsonpressurebar(SHPB) /
- EPSconcrete