北航《新型建筑材料》在线作业一BUAA new building materials online homework.docx

北航《新型建筑材料》在线作业一BUAA new building materials online homework.docx

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北航《新型建筑材料》在线作业一BUAAnewbuildingmaterialsonlinehomework

北航《新型建筑材料》在线作业一（BUAAnewbuildingmaterialsonlinehomework）

BUAA"newbuildingmaterials"onlinehomework

Totalscore:

100testtime:

-

Radioexamination

Amultiple-choicequestion

Judgmentquestion

Radioexaminationquestions（10questions,40points）

1.mixingconcretewiththesamemarkcement,thestrengthofconcretemainlydependson（）.

A.sandrate

B.waterconsumption

C.watercementratio

D.stonestrength

Fullmarks:

4

2.inthefollowingsteels,thebestplasticityandweldabilityare（）.

A.Q215

B.Q255

C.Q275

D.Q235

Fullmarks:

4

3.slagcementandvolcanicashcement,thetwo（）different.

A.frostresistance

B.hydrationheat

C.heatresistance

D.intensitydevelopment

Fullmarks:

4

4.whenthefreewaterevaporatesandtheadsorbedwaterisstillsaturated,themoisturecontentofwoodiscalledwood.

A.equilibriummoisturecontent

B.standardmoisturecontent

C.fibersaturationpoint

D.airdrywatercontent

Fullmarks:

4

5.wetsand100gwithwatercontentof5%,inwhichtheweightofwateris（）

A.5g

B.4.76

C.5.26

D.4

Fullmarks:

4

6.prestressedhollowwallboardbelongsto（）.

A.gypsumwallboard

B.cementwall

C.compositewallboard

D.netplasticsandwichpanel

Fullmarks:

4

7.theageingoflimeinorderto（）.

A.isgoodforcrystallization

B.evaporatesexcessmoisture

C.eliminatesthedangerofexcessivelime

D.reducescalories

Fullmarks:

4

Thestrengthgradeof8.firedcommonbricksisbasedon（）.

A.compressivestrengthandflexuralstrength

B.bigfaceandstripsurfacecompressivestrength

C.compressivestrengthaverageandsingleblockminimum

D.compressivestrengthaveragevalueandstrengthstandardvalue

Fullmarks:

4

9.whenchoosingthestructuralmaterialunderdynamicload,thefollowingmaterialsshouldbechosen.

A.materialswithgoodplasticity

B.materialswithgoodtoughness

C.materialwithgoodelasticity

D.materialsofgoodhardness

Fullmarks:

4

10.modulusofelasticityreflectsthequalityofsteel.

A.hardness

B.strength

C.toughness

D.stiffness

Fullmarks:

4

BUAA"newbuildingmaterials"onlinehomework

Totalscore:

100testtime:

-

Radioexamination

Amultiple-choicequestion

Judgmentquestion

（atotalof8multiple-choicequestions,atotalof32points.）

1.thestrengthofconcreteisaffectedbythefollowingfactors.

A.slump

B.watercementratio

C.cementvarieties

D.cementstrength

Fullmarks:

4

2.thefollowingchemicalelementsareharmfulimpuritiesincarbonsteel.

A.p

B.sulfur

ManganeseC.

D.oxygen

Fullmarks:

4

3.thefollowingstatementaboutslagcementiscorrect.

A.settinghardeningisslower

B.hasstrongresistancetoseawatererosion

C.hascertainheatresistance

D.haslessshrinkage

Fullmarks:

4

4.theworkabilityofconcretemainlyincludes（）andsoon.

A.fluidity

B.consistency

C.cohesiveness

D.waterretention

Fullmarks:

4

5.architecturalcoatingsareclassifiedaccordingtotheirfunctions.

A.waterproofcoating

B.exteriorwallcoating

C.fireretardantcoating

D.mildewresistantpaint

Fullmarks:

4

6.themainmeasurestoimprovethestrengthofconcreteare.

A.useshighstrengthcementorearlystrengthcement

B.usesdrycementconcretewithlowwatercementratio

C.admixtureofconcreteadmixtureandadmixture

D.usesmoistheattreatmenttomaintainconcrete

Fullmarks:

4

7.themeasurestoimprovethefluidityofconcretemixture,butnottoreducethestrengthofconcrete,areasfollows.

A.increasewateruse

ReasonablesandratioisadoptedinB.

C.takepartinwaterreducingagent

D.keepsthecementwaterratiounchangedandincreasesthecementdosage

Fullmarks:

4

8.themainmineralconstituentsinPortlandcementclinkerinclude（）

A.C3S

B.C2S

C.C3A

D.C4AF

Fullmarks:

4

BUAA"newbuildingmaterials"onlinehomework

Totalscore:

100testtime:

-

Radioexamination

Amultiple-choicequestion

Judgmentquestion

Atotalof7questions（28points）

Thewatersaturationrateof1.materialsislessthanthatofstone.

A.error

B.correct

Fullmarks:

4

2.thestrengththeoryofcementconcretepointsoutthatthestrengthofconcreteisonlyrelatedtotheratioofwatertocement.

A.error

B.correct

Fullmarks:

4

3.thecontentofsulfurinsteeliscoldbrittleness,andtheoxygencontentismorehotbrittleness.

A.error

B.correct

Fullmarks:

4

4.thechemicalreactionoflimecarbonizationisCa（OH）2+CO2=CaCO3+H2O.

A.error

B.correct

Fullmarks:

4

Thebrittlenessof5.steelbarsincreasesslightlyaftercolddrawingstrengthening.

A.error

B.correct

Fullmarks:

4

6.thechoiceofasphaltmustconsiderthenatureoftheproject,theuseofpartsandenvironmentalconditions.

A.error

B.correct

Fullmarks:

4

7.whentheotherconditionsareconstant,thecreepofconcretedecreaseswiththeincreaseoftheamountofwaterslurry,andincreaseswiththedecreaseofwatercementratio,anddecreaseswiththeincreaseoftheamountofcoarseaggregate.

A.error

B.correct

Fullmarks:

4