Hardened properties

Question1(0points)Howdoyourateyourunderstandingonthetests(compressivestrength,splittingtensilestrength,E-valueandPoissonratio)ofhardenedpropertiesofconcretebeforestartingthisquiz?Studentresponse:CorrectResponseStudentResponseAnswerChoicesa.veryunfamiliarb.unfamiliarc.neutrald.familiare.veryfamiliarQuestion2(0points)IsityourfirsttimetakingtheCSE308subject?Studentresponse:CorrectResponseStudentResponseAnswerChoicesa.Yesb.NoQuestion3(1point)Afteracubecompressivestrengthtest,thecrackappearedononesideofthespecimenisvertical,butthatontheoppositesideishorizontal.Whichofthefollowingislikelythecause?Studentresponse:CorrectResponseStudentResponseAnswerChoicesa.smallw/cratiob.segregationc.honeycombd.unevendistributionofstressQuestion4(1point)InanE-valuetest,youmakeuseofthestrengthvalueobtainedfromthecompanionspecimenstodecideyourrangeofstress.However,iftheE-valuespecimenis200mmlongbutthecompanionspecimenisonly100mmlong,thecorrectionfactorofstrengthusedinE-valuespecimenshouldbeStudentresponse:CorrectResponseStudentResponseAnswerChoicesa.0.5timesthestrengthofcompanionspecimenb.0.8timesthestrengthofcompanionspecimenc.equaltothestrengthofcompanionspecimend.1.5timesthestrengthofcompanionspecimenQuestion5(1point)WhichofthefollowingtoolisNOTusedinanE-valuetest?Studentresponse:CorrectResponseStudentResponseAnswerChoicesa.linearvariabledifferentialtransformer(LVDT)b.straingaugec.epoxyd.grinderQuestion6(1point)Inanormalconcretemixandassumingallothervariablesarekeptconstant,whatdoyouexpectonthecompressiveandsplittingtensilestrengthsifaconcreteintheconcretespecimenissegregated,Studentresponse:CorrectResponseStudentResponseAnswerChoicesa.Itincreasessignificantlyb.Itincreasesslightlyc.itdecreasesd.itremainsunchangedQuestion7(1point)Additionofflyash(i.e.pozzolans)resultsinhigherlong-termstrengthofconcretebecause1.thesmall-sizedpozzolanparticlesfillupthemicroscopicporesintheconcrete.2.thepozzolansreactwithwaterandform80%oftotalC-S-Hmatrixwithinthefirst24hoursaftermixing3.inthelongrun,thepozzolansreactwithcalciumhydroxidewhichisahydrationby-producttoformC-S-HStudentresponse:CorrectResponseStudentResponseAnswerChoicesa.1onlyb.2onlyc.1and3d.alloftheaboveQuestion8(1point)Thefailureofconcretecubesandcylindersisconsideredas‘satisfactory’whenStudentresponse:CorrectResponseStudentResponseAnswerChoicesa.theobtainedconcretestrengthishigherthanthetargetstrengthb.concretesurfaceoverallsidesofconcretepeelsoffevenlyc.cracksappearunevenlyoverdifferentfacesofconcretesubstrated.noneoftheaboveQuestion9(1point)Ingeneral,compressivestrengthandE-valueoftheconcreteareStudentresponse:CorrectResponseStudentResponseAnswerChoicesa.directlyproportionaltoeachotherb.inverselyproportionaltoeachotherc.exponentiallyproportionaltoeachotherd.parabolicallyproportionaltoeachotherQuestion10(1point)Ifyouwishtoobtaindetaileddeformationofaconcretespecimenunderstress,youshouldStudentresponse:CorrectResponseStudentResponseAnswerChoicesa.selectvariabledisplacementcontrolastheloadingmodeb.selectconstantdisplacementcontrolastheloadingmodec.selectvariableloadcontrolastheloadingmoded.selectconstantloadcontrolastheloadingmodeQuestion11(1point)Inanormalconcretemixandassumingallothervariablesarekeptconstant,whichofthefollowingreasonsleadstoahighercompressivestrengthforthecubespecimenthanthatofthecylinderspecimen?Studentresponse:CorrectResponseStudentResponseAnswerChoicesa.Thedensityofcylinderislargerb.Theslendernessratioinacylinderistwicetothatofacubec.Thedistributionofstressincylinderismoreuniformd.ThecylindercontainsmoreaggregatesQuestion12(1point)Whichofthefollowingsafetyprecautionarymeasuresshouldbecarriedoutbeforeperformingthecompressive,splittingtensilestrengthandE-valuetestsofconcretespecimens?Studentresponse:CorrectResponseStudentResponseAnswerChoicesa.Wearsafetyshoesb.Closethedooroftheloadingmachinec.Wearglovesd.alloftheaboveTotalscore:10/10=100.0%Whichofthefollowingsize(s)ofconcretesamplesis/areusuallyusedinthesplittingtensilestrengthtest?1.100mmcube2.100mm(dia.)x200mm(long)cylinder3.100mm(dia)x50mm(long)disc4.150mmcubea.2onlyQuestion4(1point)InE-valueandPoissonratiotest,whyshouldbothendsofthetestedspecimenbelevelledbeforethetest?Studentresponse:CorrectResponseStudentResponseAnswerChoicesb.AppliedstresscanbebalancedoverthecontactsurfacesothatthelongitudinalstrainsmeasuredatbothsidesareclosetoeachotherQuestion5(1point)Whichofthefollowingsize(s)ofconcretesamplesis/areusuallyusedinE-valueandPoissonratiotests?1.100mm(dia.)x200mm(long)cylinder2.150mm(dia.)x300mm(long)cylinder3.100mmcube4.150mmcubea.2onlyQuestion6(1point)Thefailureofconcretecubesandcylindersisconsideredas‘satisfactory’whenStudentresponse:CorrectResponseStudentResponseAnswerChoicesb.concretesurfaceoverallsidesofconcretepeelsoffevenlyQuestion7(1point)Inanormalconcretemixandassumingallothervariablesarekeptconstant,whatdoyouexpectonthecompressiveandsplittingtensilestrengthsifaconcreteintheconcretespecimenissegregated,c.itdecreasesQuestion8(1point)Highperformanceconcrete(HPC)isoftenusedinhigh-risebuilding.Whichofthef