4.1. (4 Pts, 2 pts @) Classify the following fine grained soils in the Unified S

Question

4.1. (4 Pts, 2 pts @) Classify the following fine grained soils in the Unified Soil Classification System and describe how the soils' characteristics lead to the assigned classification. a. A dark brown fine grained soil with no reaction to shaking, high dry strength, medium toughness and an offensive odor b. A light grey fine grained soil with no odor, a slow reaction to shaking, no dry strength, and no toughness 4.2 (20 pts; 2 pts@ classification) Classify each of the following inorganic soil samples using both the Unified Soil Classification System and AASHTO Classification System Soil Sample Sieve No 70 65 35 14. Percent Finer 100 100 98 100 100 95 87 10 38 37 28 20 27 100 200 70 Atterberg Limits (NP: Non Plastic) 35 20 20 14 NP 60 35 PL NP Grain Size Distribution Coefficients 31.58 2.25 6.38 0.79 7.69 365 0.65 0.05 0.85

Explanation / Answer

4.1. Soil classification is the arrangement of soils into various groups or subgroups to provide a common language to express the characteristics briefly without detailed explanation.

Two widlely used soil classification systems are

1. Unified Soil Classification System and

2.AASTHO system

In Unified classification system soils are 2 types

Coarse grained soil: Gravel, Sand

Fine grained soil: Silt, Clay

soils classified based on the following characterstics.

(i)Visual identification

(ii) size of soil grains

(iii) plasticity of the soil

Based on Unified classification system

a) A dark brown fine grained soil with no reaction to shaking, high dry strength and medium toughness and an offensive odor. Clay

b) A light grey fine grained soil with no odor, a slow reaction to shaking, no dry strength and no toughness. Silt

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