4.3 Classify the following soils by using the Unified soil classification system. Give the group symbols and the group names. Soil 1 2 3 4 5 6 7 8 9 10 11 12 Sieve analysis - Percent finer No. 4 No. 200 70 48 95 100 100 87 88 99 71 100 89 90 30 20 70 82 74 26 78 57 11 2 65 8 Liquid Plasticity limit index 33 41 52 30 35 38 69 54 32 44 39 21 22 28 19 21 18 38 26 16 NP 21 31 Cu 47 4.8 82 7.2 3.9 Ce 2.9 2.2 2.1

What is meant by the shear strength of soils? O A. Shear strength of a soil is its internal resistance to deformations. B. Shear strength of a soil is its iexternal resistance to shearing stresses. O C. Shear strength of a soil is its internal resistance to shearing strains. O D. Shear strength of a soil is its internal resistance to shearing stresses. QUESTION 14 Some soils show a peak shear strength? O A. These soils are generally firm (e.g. normally consolidated clays) and the confining stresses are large enough to suppress O B. These soils are generally dense and are large enough to O C. These soils are generally dense (e.g. dense sands and overconsolidated clays) and the confining stresses are not large enough to suppress dilation. O D. These soils are generally LOOSE (e g. loose sands and underconsolidated clays) and the confining stresses are large enough to suppress dilation. suppress dilation. dilation.

In natural state, a soil weighs 3500 lb/cy. The same soil has a load factor of 0.83. a. What is the unit weight of the soil in its loose state? b. A contractor has seven (7) Caterpillar 725 articulating trucks available to haul this same soil to a project that requires 55,000 ccy of the soil. In the  compacted state, the soil weighs 4300 lb/cy. Each Caterpillar 725 has a maximum haul capacity of 17 lcy. Currently the project schedule only accounts for each truck hauling no more than 550 loads to the site. Based on the maximum capacity of the Caterpillar 725, can this schedule requirement be met?

Explain the following including diagrams where necessary 1. CBR Test. 2. Compaction Test. 3. Atterberg Test