Classify the following soils by the Unified (USCS) and AASHTO methods. Where necessary, assume CU =7 and Cc=2.5.

Classify soils A, B, C, and D based on the USCS (ASTM D2487 – 17) indicating the symbol and soil description. Additionally, classify the soils according to the AASHTO Soil Classification System indicating the name of the soil group as well as the GI. Sieve Opening (mm) Percent Passing (%) Soil D Soil C Sieve Number Soil A Soil B No. 4 4.750 78 75 60 78 88 88 No. 10 2.000 75 75 75 No. 18 1.000 60 60 60 No. 30 0.600 45 45 45 45 No. 40 0.425 30 30 30 30 No. 60 0.250 22 22 22 22 No. 100 0.150 15 15 15 15 No. 140 0.105 10 10 10 14 No. 200 0.075 8. 4 13 LL 60 60 20 20 PL 25 35 14 14

The result of sieve analysis of three soils is given next. It is required to classify these soils according to the AASHTO Classification System. Use the attached AASHTO Classification of Highway Subgrade Materials Table. Sieve Analysis Sieve Diameter, Percent Passing Number mm. A В C 4 4.76 2.38 90 100 100 8 84 90 100 10 2 72 77 98 20 0.84 66 59 91 40 0.42 58 50 85 60 0.25 50 42 79 100 0.149 44 36 70 200 0.074 38 33 63 LL 42 46 47 PL 23 29 24 What is the classification of Soil A? What is the classification of Soil B? What is the classification of Soil C? EDI

Classify the following soils by the AASHTO classification system. Description Percent finer than No. 10 sieve Percent finer than No. 40 sieve Percent finer than No. 200 sieve Soil A Soil B Soil C 100 92 94 82 38 81 85 51 52 Liquid limit Plastic Limit 42 29 43 23 16 34 Table 3.1: Classification of Highway Subgrade Materials General class fication Granular materials (35% or less of total sample passing No. 200) A-2 A-1 Group classification Sieve analysis (percentage passing) No. 10 No. 40 No. 200 Characteristics of fraction passing No. 40 Liquid limit Plasticity index Usual types of significant constituent materials A-1-a A-1-b A-3 A-2-4 A-2-5 A-2-6 A-2-7 50 max. 30 max. 50 max. 51 min. 15 max. 25 max. 10 max. 35 max. 35 max. 35 max. 35 max. 40 max. 41 min. 40 max. 41 min. 10 max. 10 max. 11 min. 11 min. 6 max. NP Stone fragments, gravel, and sand Fine sand Sity or clayey gravel and sand General subgrade rating Excellent to good What is the classification of Soil A? O A-5(3) A-7-5(3) O…

Given the sieve analysis and plasticity data for five soils, classify the 5 soils according to Unified Soil Classification System (USCS) and AASHTO soil classification system. Explain your steps for each soil sample classifications.

Provide USCS classification for the soil shown on the GSC below. Your answer must contain the required information in the table provided below. Find  % gravel = %sand = %fines = D60 = D30= D10= Cu = Cc= Whats is the USCS Symbol = ?

The sieve analysis data for a granular soil are given below. • % passing 76.2 mm sieve = 98 • % passing 4.75 mm sieve = 63 • % passing 0.075 mm sieve = 16 What would be the percentage of gravel by the AASHTO classification system? Answer:

Soils Mechanics Answer exercise 3

The laboratory test results of six soils are given in the following table. Classify the soils by the AASHTO Soil Classification System and give the group indices. Sieve Analysis-Percent Passing Soil Sieve No. C D A в F 4 100 100 95 95 100 100 10 95 80 80 90 94 94 40 82 61 54 79 76 86 200 65 55 8 64 33 76 Liquid limit 42 38 NP* 35 38 52 Plastic limit 26 25 NP 26 25 28 *NP = nonplastic

2. Classify the following soils by the AASHTO classification system. Give the group index for each soil. Show the step-by-step process of classifying each soil using the AASHTO table. Soil A B с D E Sieve analysis- Percent finer No. 40 No. 10 90 86 42 92 90 74 56 28 68 48 No. 200 32 8 12 30 22 Liquid limit 28 NP 18 42 31 Plasticity index 9 13 18 5