The following tables show results from sieve analysis, hydrometer, and Atterberg limits of six soil samples (S-1 to S-6).
Table 1 - Sieve and Hydrometer Test Results.
Sieve Size (mm) | #4 4.75 | #10 2 | #40 0.425 | #200 0.075 | Hydrometer 0.002
S-1 | 100 | 98 | 80 | 50 | 20
S-2 | 90 | 80 | 55 | 10 | 1
S-3 | 100 | 95 | 92 | 5 | 1
S-4 | 100 | 80 | 70 | 40 | 1
S-5 | 96 | 92 | 79 | 70 | 21
S-6 | 98 | 60 | 50 | 40 | 20
Table 2 - Atterberg Limit Test Results.
Soil Sample | Liquid Limit (%) | Plastic Limit (%)
S-1 | 70 | 25
S-2 | Non-Plastic
S-3 | 28 | 18
S-4 | 25 | 21
S-5 | 60 | 40
S-6 | 38 | 24
1) For US standard sieve size, what are the screen openings for sieve #4, #10, #40, and #200?
2) Plot the grain size distribution or gradation curve for each sample. Follow instructions below:
- Use Microsoft Excel or semi-logarithmic graph paper. X-axis should be in log scale.
- Plot three curves on the same plot and label each curve (i.e. one plot shows S-1, S-2 and S-3; the other shows S-4, S-5 and S-6).
- Show all data points and connect with straight lines. If you use Excel, graphs should be in the form of 'Scatter with Straight Line'.
3) According to USCS, classify each sample with the two-letter symbol (e.g. CH, SP, etc.) AND group name.
4) Determine the percentage content of gravel, sand, silt, and clay sizes present in each soil sample.