EXP 2 Sieving Analysis PDF

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Summary

Determining and analyzing the soil mechanism. Sieving process to understand and study the soil material....

Description

Sieve Analysis Result Sieve Sieve Size Number (mm)

4 16 30 40 100 200 Pan

4.75 1.18 0.6 0.425 0.15 0.075 0

Mass of each Sieve (M1)

383 399 351 335 308 289 230

Mass of each Sieve + Soil retained (M2) 521 565 435 397 566 359 483

Mass of soil retained (M2-M1)

Percentage retained on each Sieve

Cumulative Percent Retained Finer (%)

138 166 84 62 258 70 253 1031

13.39 16.10 8.15 6.01 25.02 6.79 24.54

13.39 29.49 37.64 43.65 68.67 75.46 100

Percentage retained on each sieve (Sieve Number 4)

Percent Finer (Sieve Number 4)

86.61 70.51 62.36 56.35 31.33 24.54 0

Uniformity Coefficient

Coefficient of curvature

Discussion

In this dry sieve analysis experiment, there is 253g of soil passing through the sieve 0.075mm. According to USCS standard, soil particles that passing through 0.075mm are classified as silty and clay. The percentages retained on the sieve (pan – sieve size 0mm) is 24.54% which is nearly to a quarter of the total soil amount. Based on the tabulated result, there is 138g of soil retained on sieve number 4 (sieve size – 4.75mm). According to USCS standard, soil particles that are not passing through this sieve size (4.75mm) are classified as gravel.

By using 100% to deduct the each cumulative retained (%), the result of percentage finer will be obtained. The sieve size and percentage finer are needed to plot the semi log graph. The diameter corresponding to 60%, 30%, and 10% finer could be found from the semi log graph above. Which are 0.51mm, 0.15mm, and 0.022mm. The uniformity coefficient is determined as 23.18 by diving with . When the value of uniformity coefficient is larger than 6, it is said to be well graded soil. Beside than that, another evidence that prove the soil to be well graded is the coefficient of curvature. For the soil to be well graded, the value of coefficient of

curvature has to be range between 1 and 3. The coefficient of curvature obtained from this experiment is 2.01 which is lay between 1 and 3. Therefore, the soil can be said to be well graded (The Constructor, 2019).

The Constructor (2019). Uniformity Coefficient(Cu) and Coefficient of Curvature(Cc) of Soil. [online] The Constructor. Available at: https://theconstructor.org/geotechnical/uniformitycoefficient-cu-coefficient-curvature-cc-soil/34505/....