194 BuildingMaterials
PASSING
IS SIEVE -. 1012516
RETAINED-'IS SIEVE 6 3 10125
25
20
40
25
A
Alldimensionsinmillimetres
Fig.6.5LengthGauge
DeleteriousMaterialsandOrganicImpuritiesTest(IS: 2386 Part II))
Determinationofclaylumps
Thesampleofaggregateisdriedtoconstantweightat atemperaturenotexceeding 110°C.
Samplesof fineaggregateandthoseofcoarseaggregatearegiveninTable6.4.
Table6.4 SizeofParticlesandofSievesfortheclayLumpsTest
Sizeofparticlesmakingup the
samples(mm)
Fineaggregate(retainedon1.18mm
issieve)
Over4.75to 10
Over 10 to 20
Over 20 to 40
Over 40
Weightofsample(Min.)
(g)
100
1000
2000
3000
5000
Sizeofsieveforsieving
residueofclaylumps
850 Micron
2.36mm
4.75mm
4.75mm
4.75mm
Thesampleisspreadin athinlayeronthebottomofcontainerandexaminedfor claylumps.
The clay lumps,if any,arebrokenandremovedby the useofsievesasgiveninTable6.4.
Thepercentageof claylumps,
W-R
L= --xl00
W
whereW is theweightofsampleandR istheweightofsampleafterremovalof claylumps.
Notes: 1. Thesamplesselectedfrommaterialshouldbehandledcarefullytoavoidbreakingupofclay
lumps.
- Formixturesoffineandcoarseaggregates,thematerialisseparatedintotwosizeson4.75
mmISsieveforpreparingsamplesoffineandcoarseaggregates. - Theclaylumpsshouldnotexceed 1 %forfineaswellascoarseaggregatesbyweight
(IS: 383).
Determinationofclay,fine siltand fine dust
Sedimentationmethodisusedtodetermineclay, fine siltanddust,includingparticlesupto
20 micron.TheamountofsampletakenfortestisgiveninTable6.5.