Assignment_2

TCM 4434 Soils and Foundations Assignment # 2 Show all your calculations to receive the full credit. 1. (5 pts) Classify the following soils by the AASHTO classification system. No need to calculate the group index. Pick one of the soils and briefly explain how you arrive at your final answer. Soil Sieve Analysis (% Passing) Liquid Limit Plasticity Index Soil Type Designatio n No. 10 No. 40 No. 200 A 98 80 50 38 29 A-6 B 100 92 80 56 23 A-7-6 C 100 88 25 37 22 A-2-6 D 85 55 34 28 20 A-2-6 E 92 75 62 43 28 A-7-5 Soil C has sieve analysis numbers that do not qualify it to be an A-1 Soil Type, however it’s No.200 percentage fits in the criteria to be a Type A-2 soil type. Looking at its LL and PI, it qualifies to be a Type A- 2-6 soil type over the other A-2 types. 2. (5 pts) Classify the following soils by the USCS . Pick one of the soils and briefly explain how you arrive at your final answer. Inorganic Soil Sieve Analysis (% Passing) Liquid Limit Plasticity Index Group Symbol No. 4 No. 200 A 92 48 30 8 SC B 60 40 26 4 SW C 99 76 60 32 CH D 90 60 41 12 CL E 80 35 24 2 SM Soil E has more than 50% retained on the No.200 sieve, making it a course grained soil. Its PI is also less than 4, making it a SM soil type.