Standard compaction test : -
i) Standard compaction test made by standard proctor test. modified proctor test.
ii) Diameter of mould 100mm and 1273 mm high give capacity of 1000 cc.
iii) Rammer weight 2.6 kg and fall from height 310mm .
iv) Soil to be compacted in three layers being given 25 blows .
v) Ordinary compaction equipment is to be used in the field.
vi) Approximately 4.5 times in modified test .
vi) Compacting curve obtain lower.
Coefficient of uniformity: -
For coarse grained soil certain particle sizes such as D10, D30, D60 are important. The Do represents a size in mm such that 10% of the particles are finer than this size. Similarly, the soil particles finer than D60 size are 60 percent of the total mass of the sample. The size D10 is sometimes called the effective size or effective diameter. The uniformity coefficient Cu, is a measure of particle size range and is given by the ratio of D60, and D10. sizes.
Cu= D60/D10
For a uniformly graded soil Cute is nearly unity. Cute must be greater than 4 for gravels and 6foe sands.
The shape of the particles size curve is represented by the coefficient of the CCTV, give by
Cc=(D30)2/D10×D60
For a well graded soil CCTV must be between 1 to 3.
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