Analysis

 Of

Grain size

(Sieving method)

Objective

students should be able to :-

determine the grain size distribution of a soil sample with the sieving

classify and predict the movement of ground water table

Theory

soil grain size distribution obtained from the analysis of particle size. This analysis can be described quantitatively the heavy rate of particle sizes in the different soils. percent were receptive defined as the weight content of each sieve divided by the total weight of the sample. percent transparency to a sieve size is defined as 100% were receptive to gauge the total percentage of the sieve above. graph% transparency against the sieve pore is drawn on semi-logarithmic graph so that the soil gradation curve is obtained.

Uniformity coefficient is defined as:-

Cu=D 60D 10

Grading coefficient is defined as :-

Cc= D 30(D 60)(D10)

Where :-

D60 - grain size at 60% transparency

D30 - grain size at 30% transparency

D10 - grain size at 10% transparency

Apparatus

British standard sieve

Pan Balance – sensitive to 0.1 gram

Mechanical Sieve Shaker

Mortar and pestle

Procedure

1) Crushed dry land of approximately 250 g in a mortar with a pestle until all particulate rubber is separated

2) Weigh all the pots and the sieve accurate to 0.1g. sort sieves with pan and cover

3) Weighing 200g in 0.1g soil and the soil sieve using sieve shaker machine for 5 minutes

4) Weighing each sieve and its contents accurate at 0.1g. total weight of soil remaining on each sieve and pan

5) Compare the weight of the land used 200g. if it is a big difference than 1.0g, please repeat this experiment

6) Reserve land that is transparent sieve # 36 (all land below sieve # 36) for test no 4

Data and result

sieve sieve and the soil mass were receptive

mass of empty sieve

land mass were receptive

percent were receptive (%)

total percentage of transparency (%)

#7(2.36mm)

449 382 67 33.5 66.5

#14(1.18mm

)

398 357 41 20.5 46

#25(0.600m

m)

363 327 36 18 28

#36(0.42mm

)

313 294 19 9.5 18.5

#52(0.30mm

)

307 283 18 9 9.5

#72(0.212m

m)

290 277 13 6.5 3.0

#100(0.150m

m)

272 268 4 2 1.0

#200(0.07mm

)

260 258 2 1 0

pan 243 243 0 0 0Total 200

Discussion

1) plot the graph and calculate the value of Cc and Cu

Uniformitycoefficient :-

Cu=D 60D 10

Cu = 1.990.33

Cu = 6.63

Grading coefficient:-

Cc= D 30(D 60)(D10)

Cc = 0.65

(1.99)(0.3)

Cc = 1.089

Reference

1. Donald Mcglinchey, , Characterisation of bulk solids, 2005, CRC Press DT Afrika.

2. Mazlan Mohammad Abdul Hamid, Standard aggregate sieve analysis TEST, ASTM International - Standards Worldwide, (July 2008) ASTM C136-06, retrived from http://www.astm.org/

3. Norliza Muhammad, concrete laboratory,(2006). Gradation Test. (2007), NorlizaMuhammad,FajarBaktiSdn. Bhd.