道路工程材料(申爱琴版)-作业-集料&水泥(英文版)

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1、AssignmentforRoadEngineeringMaterialsChapter1&Chapter2Name：Class：NO.：SCHOOLOFHIGHWAYCOLLEGECHANG’ANUNIVERSITYOCTOBER31,2013AssignmentforRoadEngineeringMaterialsChapter1&Chapter2ChapteroneAggregate1.Herearetwokindsofstone,andthetestresultsareshowninfollowingtable.Whichkindofstonehasbetterperf

2、ormance?Solution:Step1,theporosityofthesetwostonecanbecalculatedasthefollowingformula:n=1-ρdρt×100%AndthenA=0.07>nB=0.Step2,thevaluesaturation-watercoefficientofAstoneis0.75,whichishigherthantheBstone’s,0.65.Step3,thehigherporosityofstoneis,thebetterwaterabsorptiongetsandtheworsefrostresista

3、nceis.Soisthesaturation-watercoefficient.Fromwhathasbeenmentionedabove,thestoneAapparentlygetsahigherporosityofstoneandsaturation-watercoefficient,sothestoneAisworseatfrostresistance.Conclusion:stoneBhasbetterperformance.2.Pleasedescribethedifferencebetweenstrengthindexesofstoneandaggregate,

4、andthetestmethods.Solution:a)Themajorstrengthindexforstoneisuniaxialcompressivestrength.TheresultofmeasuringuniaxialcompressivestrengthtestisrepresentedasresilientmodulusR=PAwithtriaxialchamberwithexternalLVDT’sandloadcell.Andthepreparesamplecanbecube(inroadengineering)orcylinder(inbridgeeng

5、ineering).b)Themajorstrengthindexforaggregateiscrushingvalue.Andthetestmethodisinthebelow.ProceduretodetermineAggregateCrushingValuei)Theaggregatespassingthrough12.5mmandretainedon10mmISSieveareoven-driedatatemperatureof100to110oCfor3to4hrs.ii)Thecylinderoftheapparatusisfilledin3layers,eachl

6、ayertampedwith25strokesofatampingrod.iii)Theweightofaggregatesismeasured(Weight‘A’).iv)Thesurfaceoftheaggregatesisthenleveledandtheplungerinserted.Theapparatusisthenplacedinthecompressiontestingmachineandloadedatauniformratesoastoachieve40tloadin10minutes.Afterthis,theloadisreleased.v)Thesam

7、pleisthensievedthrougha2.36mmISSieveandthefractionpassingthroughthesieveisweighed(Weight‘B’).vi)Twotestsshouldbeconducted.Aggregatecrushingvalue=(B/A)x100%.12AssignmentforRoadEngineeringMaterialsChapter1&Chapter21.Pleasedescribetheclassificationofa