Experiment 1 Grain Size Analysis Sieve Analysis Soil

Experiment # 1 Grain Size Analysis Sieve Analysis

Soil Types Coarse Soil Gravel (G ) Sand ( S ) Fine Soil Silt ( M ) Clay ( C )

Grain Size Analysis * Sizes of solid particles * Their Proportion in the soil mass

According to the ASTM *Differentiate between coarse and fine using Sieve No. 200 Size 0. 075 mm *And between Grave and Sand using Sieve No. 4 Size 4. 75 mm

OBJECTIVES u To Determine Grain Size analysis. u To classify the soil.

Apparatus u u u Set of Sieves Mortar and rubber-tipped pestle. Riffle box or Splitter Balance Brush Mechanical shaker

Sample Preparation u Air-dried. Sandy Soil ( Jahra Sand) u Minimum weight of Sample = 110 u Used about 500 gm. u

REQUIRED MEASUREMENTS 1. Weight of each sieve. u 2. Total weight of dry soil samples, Ws. u 3. Weight of each sieve and retained soil. u 4. Weight of oven dried soil passing No. 200 sieve. u

CALCULATIONS 1. Cumulative weight retained = summation of weight retained on this sieve and the upper sieves 2. 3. Percent retained: Percent passing (or percent finer than): Percent passing = 100 (cumulative percent retained)

Sieve No. Sieve diameter (mm) 4 4. 75 10 2. 0 20 0. 84 40 0. 42 100 0. 15 200 0. 075 pan Sieve weight (g) Weight of sieve + soil (g) Weight of Cumulative Per soil retained percent retained passing (g)

Grain Size Distribution Curve

Two criteria must be applied in making this determination The first criterion is the coefficient of curvature, Cc: The second criterion is the coefficient of uniformity, where, D 10 = grain diameter at 10% passing D 30 = grain diameter at 30% passing D 60 = grain diameter at 60 % passing Cu

For a soil to be well graded, the following must be satisfied: 1 < Cc < 3 u and Cu > 4 (for gravel) Cu > 6 (for sands) u If the soil fails one, or both, of these criteria, it is considered to be poorly graded. u Special cases of poorly graded soils are gap-graded and uniformly graded soils u

Type Of Compaction Curve

Hydrometer Analysis: u To Determine Grain Size Distribution for fine soil