Page 41 - ebook_soil engineering practical workbook_15112021

4.6 Result

- Fill the table as in Appendix

- Obtain the mass of soil retained on each sieve by subtracting the weight of
the empty sieve from the mass of the sieve + retained soil, and record this

mass as the weight retained on the data sheet. The sum of these retained
masses should be approximately equals the initial mass of the soil sample.
A loss of more than two percent is unsatisfactory.

- Calculate the percent retained on each sieve by dividing the weight

retained on each sieve by the original sample mass.

- Calculate the percent passing (or percent finer) by starting with 100

percent and subtracting the percent retained on each sieve as a cumulative
procedure.

- Plot percent passed (finer) for both the sieve and hydrometer analysis on

the 4 cycle semilog graph paper provided. Differentiate between the two
types of data points.

- Determine the percent sand, silt, and clay and soil type. Note that gravel (>
2.00 mm) is not considered soil in this classification. All other fraction

percentages must thus be increased proportionately.

- Determine effective grain size D10, for the soil. and calculate a coefficient of

uniformity Cu, coefficient of curvature Cc for the soil.

33 | Soil Engineering Practical Workbook