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| **Question: Sieve analysis — Percent finer Soil No. 10 No. 40 No. 200 Liquid limit Plasticity 1 1 98 80 50 38 100 92 80 56 100 88 65 37 4 85 55 45 28 20 92 75 62...** | | | | | | |
| | **Sieve analysis — Percent finer** | | | | |
| **Soil** | **No. 10 ** | **No. 40 ** | **No. 200 ** | **Liquid limit** | **Plasticity** |
| 1 | 98 | 80 | 50 | 38 | 29 |
| 2 | 100 | 92 | 80 | 56 | 23 |
| 3 | 100 | 88 | 65 | 37 | 22 |
| 4 | 85 | 55 | 45 | 28 | 20 |
| 5 | 92 | 75 | 62 | 43 | 28 |
| 6 | 97 | 60 | 30 | 25 | 16 |
| 7 | 100 | 55 | 8 | — | NP |
| 8 | 94 | 80 | 63 | 40 | 21 |
| 9 | 83 | 48 | 20 | 20 | 15 |
| 10 | 100 | 92 | 86 | 70 | 38 |
** 5.5 Determine the group symbols for the fine-grained soils give by the Unified soil classification system.**
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Answer
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Step 1:I'll solve this problem step by step using the Unified Soil Classification System (USCS) for fine-grained soils.
Step 2:: Identify Fine-Grained Soil Classification Criteria
- Percent passing No. 200 sieve ($$P_{200}$$)
For fine-grained soils, the USCS uses two key parameters: - Plasticity characteristics (Liquid Limit and Plasticity Index)
Step 3:: Classify Soils Based on Percent Passing No. 200 Sieve
- If $$P_{200} \geq 50\%$$, the soil is classified as a fine-grained soil
- If P_{200} < 50\%, the soil is not a fine-grained soil
Step 4:: Determine Plasticity Characteristics
We'll use the Atterberg Limits (Liquid Limit and Plasticity Index) to further classify the soils: - Liquid Limit (LL) - Plasticity Index (PI)
Step 5:: Detailed Classification for Each Soil
- Classification: $$CH$$ (Clay of high plasticity)
Soil 1: - LL = 38 - PI = 29 Soil 2: - LL = 56 - PI = 23 Soil 3: - LL = 37 - PI = 22 Soil 4: - Classification: Not applicable for fine-grained soils Soil 5: - LL = 43 - PI = 28 Soil 6: - Classification: Not applicable for fine-grained soils Soil 7: - Classification: Not applicable for fine-grained soils Soil 8: - LL = 40 - PI = 21 Soil 9: - Classification: Not applicable for fine-grained soils Soil 10: - LL = 70 - PI = 38
Final Answer
Fine-grained soil classifications: - Soil 1: CL - Soil 2: CH - Soil 3: CL - Soil 4: Not a fine-grained soil - Soil 5: CL - Soil 6: Not a fine-grained soil - Soil 7: Not a fine-grained soil - Soil 8: CL - Soil 9: Not a fine-grained soil - Soil 10: CH
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