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《专业英语摘要翻译》课程作业专业年级姓名学号**大学土木工程学院2015年6月PreparationofC200greenreactivepowderconcreteanditsstatic-dynamicbeh__iorsC200绿色活性粉末混凝土的制备和它的静力、动力性能的研究AbstractInthispaperanewtypeofgreenreactivepowderconcreteGRPCwithcompressivestrengthof200MPaC200GRPCispreparedbyutilizingcompositemineraladmixturesnaturalfineaggregatesshortandfinesteelfibers.Thequasi-staticmechanicalpropertiesmechanicalstrengthfractureenergyandfiber–__trixinte___cialbondingstrengthofGRPCspecimenscuredinthreedifferenttypesofregimesstandardcuringsteamcuringandautocl__ecuringareinvestigated.TheexperimentalresultsshowthatthemechanicalpropertiesoftheC200GRPC__dewiththe__mentitious__terialsconsistingof40%ofPortland__ment25%ofultrafineslag25%ofultrafineflyashand10%ofsilicafume4%volumefractionofsteelfiberarehigherthantheothers.Thecorrespondingcompressivestrengthflexuralstrengthfractureenergyandfiber–__trixinte___cialbondingstrengtharemorethan200MPa60MPa30000J/m2and14MParespectively.Thedynamictensilebeh__ioroftheC200GRPCisalsoinvestigatedthroughtheSplitHopkinsonPressureBarSHPBaccordingtothespallingphenomena.Thedynamictestingresultsdemonstratethatstrainratehasanimportanteffectonthedynamictensilebeh__iorofC200GRPC.Withanincreaseofstrainratethepeakstressrapidlyincreasesinthedynamictensilestress–timecurves.TheC200GRPCexhibitsanobviousstrainratestiffeningeffectinthecaseofhighstrainrate.Finallythemechani__ofex__llentstaticanddynamicpropertiesgainsofC200GRPCisalsodiscussed.摘要本文,使用合成矿物外加剂、天然细骨料、短细钢纤维制备了一种抗压强度200MPa的绿色活性粉末混凝土(GRPC)研究了GRPC样本在三种不同养护制度下(标准养护、蒸汽养护、蒸压养护)的拟静力性能(力学强度、断裂能力和纤维矩阵界面粘合强度)实验结果表明由胶结材料(包括40%波特兰水泥、25%超细炉渣、25%超细飞灰和10%硅粉、4%容积率的钢纤维)制成的C200GRPC的力学性能比其它的高相应的抗压强度超过200MPa,抗弯强度超过60MPa,断裂能力超过30000J/m2,纤维矩阵界面粘合强度超过14MPa根据剥落现象通过分离式霍普金森压杆研究了C200GRPC的动力抗拉性能动力测试结果表明应变率对C200GRPC相应的动力抗拉性能有重要影响在动力抗拉应力-时间曲线上,随应变率提高,峰值应力很快提高在高应变率情况下,C200GRPC展示了明显的应变率硬化效果最后,本文也讨论了C200GRPC良好的静力和动力性能增加机理Influen__ofaggregateandcuringregimeonthemechanicalpropertiesofultra-highperfor__n__fibrereinfor__dconcreteUHPFRC骨料和养护制度对超高性能纤维加固混凝土力学性能影响的研究AbstractAnewgenerationofconcreteultra-highperfor__n__fibrereinfor__dconcreteUHPFRChasbeendevelopedforitsoutstandingmechanicalperfor__n__andshowsaverypromisingfutureinconstructionapplications.Inthispaperseveralpossibilitiesareexaminedforreducingthepri__ofproducingUHPFRCandforbringingUHPFRCawayfromsolelyprecastapplicationsandontotheconstructionsiteasaninsitu__terial.Recycledglassculletandtwotypesoflocalnaturalsandwereexaminedasrepla__ment__terialsforthemoreexpensivesilicasandnor__llyusedtoprodu__UHPFRC.InadditioncuringofUHPFRCcubesandpri__sat20oCand90oChasbeeninvestigatedtodeterminedifferen__sinbothmechanicalandductility.Theresultsshowedthatusingmoreangularsandparticlesredu__stheflowabilityoffreshUHPFRC.Thelocalnaturalsandcanprodu__asimilarmechanicalandductilityofUHPFRCtothesilicasand.HowevertheuseofRecycledGlassCulletR__givesapproxi__tely15%lowerperfor__n__i.e.flexuralstrengthcompressivestrengthandfractureenergy.Specimenscuredat20oCgiveapproxi__tely20%lowercompressivestrength10%lowerflexuralstrengthand15%lowerfractureenergythanspecimenscuredat90oCfrom1to7days.摘要作为一种新的混凝土,超高性能纤维加固混凝土(UHPFRC)由于突出的力学性能而被发展,在施工应用方面有很大的潜力本文验证了降低UHPFRC的成本,把UHPFRC从单独预制应用转移到施工场地作为原产地材料的可能性再生玻璃和两种天然砂代替了更昂贵、通常用来生产UHPFRC的石英砂此外,研究了UHPFRC立方体和棱柱体在20摄氏度和90摄氏度的养护来确定力学和延性差异研究表明使用更多砾砂减少了UHPFRC的流动性比起石英砂,天然砂可以使UHPFRC产生相似的力学和延性然而,再生玻璃的使用大约降低了15%的性能,包括抗弯强度、抗压强度和断裂能力1到7天强度,比起90摄氏度养护下的样本,20摄氏度养护下的样本大约降低20%抗压强度,10%抗弯强度和15%的断裂能力Effectsofw/cratioandcuringconditionsonstrengthdevelopmentinBRE__Mconcretes水灰比和养护制度对BRE__M混凝土强度发展的影响的研究AbstractTheearlystrengthdevelopmentof‘BRE__M’concretes__defrom50:50mixturesofcalciumaluminate__mentCACandgroundgranulatedblastfurna__slagggbsusing100-mmcubesatw/cratiosof
0.35and
0.45hasbeenstu___d.BRE__Mconcretesshowedgoodstrengthdevelopmentatbothw/cratioswhetherwatercuredoraircured.Incontrastlonger-termstu___swith1-mcubescuredundernear-adiabaticconditionsh__eindicatedthat__ssBRE__Mconcretesofsimilarbindercomposition__ygaincompressivestrengthrelativelyslowly.Thisispri__rilyduetotheheatofhydrationoftheCACcomponentwhichcanleadtotemperaturesofupto60oCresultinginrapidhydrationandconversionofthecalciumaluminatecomponent.Howevertheperfor__n__of40CAC/60ggbsconcreteunderthesenear-adiabaticconditionshasprovedtobesatisfactoryoveraperiodof5yearswithsimilarstrengthdevelopmenttothatofequivalent100-mmcubesstoredunderambientconditions.摘要。