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’ANUNIVERSITYOCTOBER31,2013ChapteroneAggregate1.Herearetwokindsofstone,andthetestresultsareshowninfollowingtable.Whichkindofstonehasbetterperformance?Solu

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

3、iongetsandtheworsefrostresistanceis.Soisthesaturation-watercoefficient.Fromwhathasbeenmentionedabove,thestoneAapparentlygetsahigherporosityofstoneandsaturation-watercoefficient,sothestoneAisworseatfrostresistance.Conclusion:stoneBhasbetterperformance

4、.2.Pleasedescribethedifferencebetweenstrengthindexesofstoneandaggregate,andthetestmethods.Solution:a)Themajorstrengthindexforstoneisuniaxialcompressivestrength.TheresultofmeasuringuniaxialcompressivestrengthtestisrepresentedasresilientmodulusR=PAwith

5、triaxialchamberwithexternalLVDT’sandloadcell.Andthepreparesamplecanbecube(inroadengineering)orcylinder(inbridgeengineering).b)Themajorstrengthindexforaggregateiscrushingvalue.Andthetestmethodisinthebelow.ProceduretodetermineAggregateCrushingValuei)Th

6、eaggregatespassingthrough12.5mmandretainedon10mmISSieveareoven-driedatatemperatureof100to110oCfor3to4hrs.ii)Thecylinderoftheapparatusisfilledin3layers,eachlayertampedwith25strokesofatampingrod.iii)Theweightofaggregatesismeasured(Weight‘A’).iv)Thesurf

7、aceoftheaggregatesisthenleveledandtheplungerinserted.Theapparatusisthenplacedinthecompressiontestingmachineandloadedatauniformratesoastoachieve40tloadin10minutes.Afterthis,theloadisreleased.v)Thesampleisthensievedthrougha2.36mmISSieveandthefractionpa

8、ssingthroughthesieveisweighed(Weight‘B’).vi)Twotestsshouldbeconducted.Aggregatecrushingvalue=(B/A)x100%.1.PleasedescribetheclassificationofaggregatefromdeferentperspectivesSolution：Solution:Notification:Thereissomeothertypesofaggregatebydifferentstan