Angularity Number of Coarse Aggregate (Is_2386-Part 1-1963)

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ANGULARITYNUMBEROFCOARSEAGGREGATE(IS:2386Part11963)PublishedbySuryakantaonMay8,2013|2Responses

ObjectiveFordeterminationofangularitynumberofcoarseaggregates.

ReferenceStandardsIS:2386(PartI)1963Methodoftestforaggregatesforconcrete(PartI)Particlesizeandshape.

Equipment&ApparatusBalance(010kg)Sieves(20,16,12.5,10,6.3,4.75mm)MetalcylinderTampingrodScoop

TestSamplePreparationThetestsampleconsistofaggregateretainedbetweentheappropriatepairofISsieves

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3/20/2015 ANGULARITYNUMBEROFCOARSEAGGREGATE(IS:2386Part11963)

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fromthefollowingsets

PASSING RETAINED

20mm 16mm

16mm 12.5mm

12.5mm 10mm

10mm 6.3mm

6.3mm 4.75mm

Theaggregatetobetestedisdriedforatleast24hoursinawellventilatedovenmaintainedatatemperatureof100to110 C.

Procedure1. Theaggregateiscompactedinthreelayers,eachlayerbeinggiven100blowsusing

thestandardtampingrodatarateof2blows/secondbyliftingtherod5cmabovethesurfaceoftheaggregateandthenallowingittofallfreely.

2. Theblowsareuniformlydistributedoverthesurfaceoftheaggregate.3. Aftercompactingthethirdlayer,thecylinderisfilledtooverflowingandexcess

materialisremovedoffwithtempingrodasastraightedge.4. Theaggregatewithcylinderisthenweighed.Threeseparatedeterminationsaremade

andmeanweightoftheaggregateinthecylinderiscalculated.

Calculation

0

3/20/2015 ANGULARITYNUMBEROFCOARSEAGGREGATE(IS:2386Part11963)

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Where,

W=meanweightoftheaggregatefillingcylinder.

C=Weightofwaterrequiredtocompletelyfillthecylinder(i.e.Volumeofcylinder)

G =SpecificGravityoftheaggregate

ReportsThemeanvalueofthreedeterminations,expressedtothenearestwholenumberisreported.

Safety&PrecautionsUsesafetyshoes,mask&apronsatthetimeoftest.Thoroughlyclean&drythecontainerbeforetesting.Specialcareshouldbetakenthatnoouterairenterswhenusingthebalance.Aftertestsieveshouldbecleanbyasoftbrush.

s

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2Responses

rakeshkumarNovember19,2014at12:03am|Permalink|Reply

Inangularitytestis2386part1TheCisweightofwater+cylinder..Intheformula67(100W/CG)

SuryakantaNovember19,2014at2:55pm|Permalink|Reply

C=Weightofwaterrequiredtofillthecylinder.Wedothisinordertomeasurethevolumeofthecylinder.

Pleasecommentwithyourrealnameusinggoodmanners.

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