道路工程材料(申爱琴版)-作业-集料&水泥(英文版)

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1、实用标准AssignmentforRoadEngineeringMaterialsChapter1&Chapter2Name：Class：NO.：文案大全实用标准SCHOOLOFHIGHWAYCOLLEGECHANG’ANUNIVERSITYOCTOBER31,2013文案大全实用标准ChapteroneAggregate1.Herearetwokindsofstone,andthetestresultsareshowninfollowingtable.Whichkindofstonehasbetterperformance?Solution:Step1,theporosityo

2、fthesetwostonecanbecalculatedasthefollowingformula:n=1-ρdρt×100%AndthenA=0.07>nB=0.Step2,thevaluesaturation-watercoefficientofAstoneis0.75,whichishigherthantheBstone’s,0.65.Step3,thehigherporosityofstoneis,thebetterwaterabsorptiongetsandtheworsefrostresistanceis.Soisthesaturation-watercoeffic

3、ient.Fromwhathasbeenmentionedabove,thestoneAapparentlygetsahigherporosityofstoneandsaturation-watercoefficient,sothestoneAisworseatfrostresistance.Conclusion:stoneBhasbetterperformance.2.Pleasedescribethedifferencebetweenstrengthindexesofstoneandaggregate,andthetestmethods.Solution:a)Themajor

4、strengthindexforstoneisuniaxialcompressivestrength.TheresultofmeasuringuniaxialcompressivestrengthtestisrepresentedasresilientmodulusR=PAwithtriaxialchamberwithexternalLVDT’sandloadcell.Andthepreparesamplecanbecube(inroadengineering)orcylinder(inbridgeengineering).b)Themajorstrengthindexforag

5、gregateiscrushingvalue.Andthetestmethodisinthebelow.ProceduretodetermineAggregateCrushingValuei)Theaggregatespassingthrough12.5mmandretainedon10mmISSieveareoven-dried文案大全实用标准atatemperatureof100to110oCfor3to4hrs.ii)Thecylinderoftheapparatusisfilledin3layers,eachlayertampedwith25strokesofatampi

6、ngrod.iii)Theweightofaggregatesismeasured(Weight‘A’).iv)Thesurfaceoftheaggregatesisthenleveledandtheplungerinserted.Theapparatusisthenplacedinthecompressiontestingmachineandloadedatauniformratesoastoachieve40tloadin10minutes.Afterthis,theloadisreleased.v)Thesampleisthensievedthrougha2.36mmISS

7、ieveandthefractionpassingthroughthesieveisweighed(Weight‘B’).vi)Twotestsshouldbeconducted.Aggregatecrushingvalue=(B/A)x100%.1.PleasedescribetheclassificationofaggregatefromdeferentperspectivesSolution：Solution:Notification:Thereissomeothertyp