TESTOFFINENESSOFSANDLecturer:Dr.HeWemin26May,2018TRAININGMODULETESTOFSANDContentsConceptsTestMethodEvaluationoftheResultsExampleFineness：TheaveragefinenessofdifferentsizesofsandGraingradation：Collocationofdifferentsizesofsand.single-retained：

Percentage

of

weight-retained/totalweightCumulative-retained:theindividualpercentageitselfandthepercentageabove1.Conceptssieveshaker&sieves150μm300μm600μm1.18mm2.36mm4.75mmBalanceMajorInstruments2.TestMethodStep1

Sampling

QuarterDivisionMethodPileupsandabout20mmthicknessvertically

divideinto

fourpartsTaketheoppositetwocopiesRepeat

the

ProcessuntiltheRequiredquantity2.TestMethodSievethesinglesieveonebyoneWeigh500gdriedsandSievethewholesieves10minsbysieveshakerorhandSieveindividuallyonebyoneWeightheretainedsandofeachsieve2.TestMethodStep2

Sieving

SievesizeWeightretained(g)Singleretained(%)Cumulativeretained(%)4.75

m

1a1

=

A1=a1

2.36

m2a2

=

A2=a1+a2=A1+a2

1.18

m3a3

=

A3=a1+a2+a3=A2+a3

0.60

m4a4

=

A4=A3+a4

0.30

m5a5

=

A5=

A4+a5

0.15m6a6

=A6=A5+a6

Sievebottom

m7/

/3.EvaluationoftheResultsLossPercentageorexcessPercentageFinenessmodule3.EvaluationoftheResultsThe

difference

between

2finenessmodule≤0.2lossratioorexcessratio≤1%3.EvaluationoftheResultsTwoParallel

tests

shouldbe

conducted

Finenessmodule3.7～3.1

Coarsesand3.0～2.3Mediumsand2.2～1.6Finesand3.EvaluationoftheResultsNoSievesize（mm）4.752.361.180.600.300.15Sievebottom

Lossper(%)1Weight-retained(g)073461661275236

0

Single-retained（%）014.69.233.225.310.4/Cumulative-retained（%）014.623.857.082.392.7/

2Weight-retained(g)0685014213660410.68Single-retained（%）013.610.028.427.212.0/Cumulative-retained（%）013.623.652.079.291.2/3AverageCumulative-retained01424548192/4.Examples=

=2.70

=

=2.60

So,this