道路工程材料（申爱琴版)_作业_集料&水泥（英文版)

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1、范文范例学习指导AssignmentforRoadEngineeringMaterialsChapter1&Chapter2Name：Class：NO.：SCHOOLOFHIGHWAYCOLLEGECHANG’ANUNIVERSITYOCTOBER31,2013word整理版范文范例学习指导ChapteroneAggregate1.Herearetwokindsofstone,andthetestresultsareshowninfollowingtable.Whichkindofstonehasbetterperformance?Solution:Step1,theporosityofth

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

3、whathasbeenmentionedabove,thestoneAapparentlygetsahigherporosityofstoneandsaturation-watercoefficient,sothestoneAisworseatfrostresistance.Conclusion:stoneBhasbetterperformance.2.Pleasedescribethedifferencebetweenstrengthindexesofstoneandaggregate,andthetestmethods.Solution:a)Themajorstrengthindexfo

4、rstoneisuniaxialcompressivestrength.TheresultofmeasuringuniaxialcompressivestrengthtestisrepresentedasresilientmodulusR=PAwithtriaxialchamberwithexternalLVDT’sandloadcell.Andthepreparesamplecanbecube(inroadengineering)orcylinder(inbridgeengineering).b)Themajorstrengthindexforaggregateiscrushingvalu

5、e.Andthetestmethodisinthebelow.ProceduretodetermineAggregateCrushingValuei)Theaggregatespassingthrough12.5mmandretainedon10mmISSieveareoven-driedatatemperatureof100to110oCfor3to4hrs.ii)Thecylinderoftheapparatusisfilledin3layers,eachlayertampedwith25strokesofatampingrod.iii)Theweightofaggregatesisme

6、asured(Weight‘A’).iv)Thesurfaceoftheaggregatesisthenleveledandtheplungerinserted.Theapparatusisthenplacedinthecompressiontestingmachineandloadedatauniformratesoastoachieve40tloadin10minutes.Afterthis,theloadisreleased.v)Thesampleisthensievedthrougha2.36mmISSieveandthefractionpassingthroughthesievei

7、sweighed(Weight‘B’).vi)Twotestsshouldbeconducted.Aggregatecrushingvalue=(B/A)x100%.word整理版范文范例学习指导1.PleasedescribetheclassificationofaggregatefromdeferentperspectivesSolution：Solution:Notification:Thereisso