道路工程材料申爱琴版作业集料水泥英文版Word文档格式.docx

道路工程材料申爱琴版作业集料水泥英文版Word文档格式.docx

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Class：

NO.：

SCHOOLOFHIGHWAYCOLLEGE

CHANG’ANUNIVERSITY

OCTOBER31,2013

ChapteroneAggregate

1.Herearetwokindsofstone,andthetestresultsareshowninfollowingtable.Whichkindofstonehasbetterperformance?

Solution:

Step1,theporosityofthesetwostonecanbecalculatedasthefollowingformula:

Andthe

.

Step2,thevaluesaturation-watercoefficientofAstoneis0.75,whichishigherthantheBstone’s,0.65.

Step3,thehigherporosityofstoneis,thebetterwaterabsorptiongetsandtheworsefrostresistanceis.Soisthesaturation-watercoefficient.Fromwhathasbeenmentionedabove,thestoneAapparentlygetsahigherporosityofstoneandsaturation-watercoefficient,sothestoneAisworseatfrostresistance.

Conclusion:

stoneBhasbetterperformance.

2.Pleasedescribethedifferencebetweenstrengthindexesofstoneandaggregate,andthetestmethods.

a）Themajorstrengthindexforstoneisuniaxialcompressivestrength.Theresultofmeasuringuniaxialcompressivestrengthtestisrepresentedasresilientmodulus

withtriaxialchamberwithexternalLVDT’sandloadcell.Andthepreparesamplecanbecube（inroadengineering）orcylinder（inbridgeengineering）.

b）Themajorstrengthindexforaggregateiscrushingvalue.Andthetestmethodisinthebelow.

ProceduretodetermineAggregateCrushingValue

i）Theaggregatespassingthrough12.5mmandretainedon10mmISSieveareoven-driedatatemperatureof100to110oCfor3to4hrs.

ii）Thecylinderoftheapparatusisfilledin3layers,eachlayertampedwith25strokesofatampingrod.

iii）Theweightofaggregatesismeasured（Weight‘A’）.

iv）Thesurfaceoftheaggregatesisthenleveledandtheplungerinserted.Theapparatusisthenplacedinthecompressiontestingmachineandloadedatauniformratesoastoachieve40tloadin10minutes.Afterthis,theloadisreleased.

v）Thesampleisthensievedthrougha2.36mmISSieveandthefractionpassingthroughthesieveisweighed（Weight‘B’）.

vi）Twotestsshouldbeconducted.

Aggregatecrushingvalue=（B/A）x100%.

3.Pleasedescribetheclassificationofaggregatefromdeferentperspectives

Solution：

Notification:

Thereissomeothertypesofaggregatebydifferentstandards

●Crashedgravel

●Crushedsand

●Stonechip

●Filler

●Slag

4.Therearetwokindsofaggregate,andthetestresultsareshowninfollowingtable.Pleasedescribethedifferenceoftheperformanceofthesetwokindsofaggregate.

Thelowercrushingvalueis,thebetteranti-crushingperformanceaggregategets.AndsoistheLosAngelesabrasionration.So,theaggregateBhasabetteranti-crushingandanti-crushingandabrasivenessperformance.

Thehigherpolishingvalueis,thebetteranti-slipperformanceaggregategets.So,theaggregateAhasabetteranti-slipperformance.

5.Pleasedescribethedefinition,thetestandthecalculationmethodsofdensitiesofaggregate,andgivetherankofdifferentdensities.

a）Truedensity:

Definition:

themassofaunitvolumeoftheimpermeableportionofmaterial,includingthesolidandimpermeablepore..

Test:

LeChatelierflaskmethod

Calculationmethod:

b）Apparentdensity:

themassofaunitvolumeoftheimpermeableportionofmaterial,includingthesolidandimpermeablepore.

Wirebasketmethods

c）Bulkdensity:

themassofaunitvolumeofmaterialundernaturalstatus,includingsolid,permeableandimpermeablepores.

Wirebasketmethodsforcoarseaggregate

Flaskmethodforfineaggregate

d）Stackingdensity：

drymassperunitvolumeofaggregateundersomestackingmethods.

including：

Loosedensity,Tampingdensity,Compactiondensity

Rank:

6.

ThegradationcurvesofthreekindsofaggregateareshowinrightFig.Pleasejudgethegradationcategories,andthestructureofasphaltmixtureconsistedoftheseaggregate

GradationAisthegapgradation.Oneormoreintermediateparticlesizesaggregatesaremissing.

GradationBisthecontinuousgradation.Theparticlesdistributeoneachsievesizefromthelargetosmall.

GradationCistheopengradation.Theparticlesdistributeonlargersievesize.

7.DiscussthedifferencesbetweengradationandfinenessmodulusoffineaggregateHavesandAandsandB,whichhavethesamefinenessmodulus,thesamegradation?

Gradation,theparticlesizesandsizedistribution,referstotheproportionbymassorweightofaggregateparticlesdistributedinspecialparticle-sizeranges,notonlytoindividualfineandcoarseaggregate,butalsotothecombinedormixedaggregate

Finenessmodulus,avalue